Page 1 SiUS341802E Service Manual Aurora Series RXLQ72-240TATJU RXLQ72-240TAYDU RXLQ72-240TAYCU RXYQ72-384TAYCU Heat Pump 60 Hz...
Page 2: Table Of Contents
SiUS341802E RXLQ-TA Aurora Series RXYQ-TA Heat Pump R-410A 60 Hz 1. Safety Cautions..................vii 1.1 Warnings and Cautions Regarding Safety of Workers........ vii 1.2 Warnings and Cautions Regarding Safety of Users........ix 2. Used Icons ....................xii Part 1 General Information .............. 1 1.
Page 3 SiUS341802E 3.3 Cooling Oil Return Operation ..............24 3.4 Defrost Heating Oil Return Operation ............25 Part 3 Remote Controller ............... 26 1. Applicable Models ..................27 2. Names and Functions ................28 2.1 BRC1E73 ....................28 2.2 Wireless Remote Controller ............... 31 3.
Page 4 SiUS341802E 7.2 Oil Return Operation .................. 61 7.3 Defrost Operation ..................63 7.4 Outdoor Unit Rotation................. 64 8. Other Control.....................65 8.1 Backup Operation..................65 8.2 Demand Operation ..................65 8.3 Heating Operation Prohibition ..............66 9. Outline of Control (Indoor Unit) ..............67 9.1 Operation Flowchart ...................
Page 5 SiUS341802E Part 6 Service Diagnosis.............. 142 1. Symptom-based Troubleshooting ............145 1.1 Indoor Unit Overall ................... 145 1.2 With Optional Infrared Presence/Floor Sensor......... 148 1.3 Wired Remote Controller................149 1.4 Wireless Remote Controller ..............150 1.5 Error Codes and Descriptions ..............152 1.6 Error Codes - Sub Codes .................
Page 6 SiUS341802E 2.38 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB).................... 224 2.39 Outdoor Fan Motor Signal Abnormality ............ 225 2.40 Outdoor Fan PCB Abnormality..............226 2.41 Thermistor Abnormality ................227 2.42 High Pressure Sensor Abnormality ............229 2.43 Low Pressure Sensor Abnormality ............230 2.44 Inverter PCB Abnormality.................
Page 7 SiUS341802E 3.9 Pressure Sensor Check ................297 3.10 Broken Wire Check of the Relay Wires ............ 298 3.11 Fan Motor Connector Check (Power Supply Cable) ........ 299 3.12 Fan Motor Connector Check (Signal Cable) ..........299 3.13 Electronic Expansion Valve Coil Check ........... 300 Part 7 Appendix................
Page 8: Safety Cautions
Safety Cautions SiUS341802E 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. This manual is for the person in charge of maintenance and...
Page 9 SiUS341802E Safety Cautions Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.
Page 10: Warnings And Cautions Regarding Safety Of Users
Safety Cautions SiUS341802E Caution Be sure to conduct repair work with appropriate tools. The use of inappropriate tools may cause injury. Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns.
Page 11 SiUS341802E Safety Cautions Warning Be sure to use the specified cable for wiring between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals. Improper connections may cause excessive heat generation or fire.
Page 12 Safety Cautions SiUS341802E Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks.
Page 13: Used Icons
SiUS341802E Used Icons 2. Used Icons The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning A Warning is used when there is danger of personal injury. Warning Caution A Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, lose data, get Caution...
Page 14: Part 1 General Information
SiUS341802E Part 1 General Information 1. Model Names ....................2 1.1 Indoor Unit....................2 1.2 Outdoor Unit ....................2 1.3 Air Treatment Equipment ................3 2. External Appearance................... 4 2.1 Indoor Unit....................4 2.2 Outdoor Unit ....................5 2.3 Air Treatment Equipment ................6 3.
Page 15: Model Names
24TA 30TA 36TA 42TA 48TA 54TA 60TA — — VJUD : 1 phase, 208/230 V, 60 Hz U(VJU) : Standard symbol Outdoor Unit Capacity Range (ton) Power Supply, Standard Capacity Index Aurora Series RXLQ 72TA 96TA 120TA 144TA — 192TA — Heat Pump Standard Series RXYQ...
Page 16: Air Treatment Equipment
Model Names SiUS341802E Aurora Series RXLQ-TATJU (208/230 V) Model name RXLQ72TATJU RXLQ96TATJU RXLQ120TATJU Outdoor unit 1 RXLQ72TATJU RXLQ96TATJU RXLQ120TATJU Model name RXLQ144TATJU RXLQ192TATJU RXLQ240TATJU Outdoor unit 1 RXLQ72TATJU RXLQ96TATJU RXLQ120TATJU Outdoor unit 2 RXLQ72TATJU RXLQ96TATJU RXLQ120TATJU Aurora Series RXLQ-TAYDU (460 V)
Page 17: External Appearance
SiUS341802E External Appearance 2. External Appearance Indoor Unit Ceiling mounted cassette (Round flow with sensing) type Ceiling mounted duct type (Middle and high static pressure) FXFQ-T FXMQ-PB Shown with BYCQ125B-W1 Ceiling mounted cassette (Round flow) type Ceiling mounted duct type FXFQ-P FXMQ-M Shown with BYCP125K-W1...
Page 18: Outdoor Unit
External Appearance SiUS341802E Outdoor Unit Single Outdoor Unit RXLQ72/96/120TATJU RXLQ72/96/120TAYDU RXLQ72/96/120TAYCU RXYQ72/96/120/144/168TAYCU Double Outdoor Unit RXLQ144/192/240TATJU RXLQ144/192/240TAYDU RXLQ144/192/240TAYCU RXYQ192/216/240/264/288/312/336TAYCU Triple Outdoor Unit RXYQ360/384TAYCU General Information...
Page 19: Air Treatment Equipment
SiUS341802E External Appearance Air Treatment Equipment Outdoor-air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G General Information...
Page 20: Combination Of Outdoor Units
Combination of Outdoor Units SiUS341802E 3. Combination of Outdoor Units RXLQ-TATJU, RXLQ-TAYDU, RXLQ-TAYCU System capacity Module Number of Outdoor Unit Multi Connection units Piping Kit 21.1 28.1 — 12.5 35.2 42.2 56.3 BHFP22P100U 70.3 Note: 1 For multiple connection, the outdoor unit multi connection piping kit (separately sold) is required. RXYQ-TAYCU System capacity Module...
Page 21: Capacity Range
30% of the capacity index of the outdoor units. And the connection ratio must not exceed 100%. ∗3. It is permitted to use a maximum connection ratio of 130% in some circumstances – please contact your local Daikin representative for further details. RXYQ-TAYCU Max. combination ratio...
Page 22: Outdoor Unit Combinations
Capacity Range SiUS341802E Outdoor Unit Combinations RXLQ-TATJU, RXLQ-TAYDU, RXLQ-TAYCU Capacity Range (ton) 72TATJU 96TATJU 120TATJU 144TATJU 192TATJU 240TATJU RXLQ 72TAYDU 96TAYDU 120TAYDU 144TAYDU 192TAYDU 240TAYDU 72TAYCU 96TAYCU 120TAYCU 144TAYCU 192TAYCU 240TAYCU Max. Number of Connectable Indoor Units Total Capacity Index of 51-93 68-124 84-156...
Page 23: Part 2 Refrigerant Circuit
SiUS341802E Part 2 Refrigerant Circuit 1. Refrigerant Circuit ..................11 1.1 Outdoor Unit ....................11 1.2 Indoor Unit....................14 1.3 Outdoor-Air Processing Unit............... 16 2. Functional Parts Layout ................17 2.1 RXLQ72TATJU, RXLQ72TAYDU, RXLQ72TAYCU, RXYQ72-120TAYCU.................. 17 2.2 RXLQ96/120TATJU, RXLQ96/120TAYDU, RXLQ96/120TAYCU, RXYQ144/168TAYCU ..........20 3.
Page 24: Refrigerant Circuit
Refrigerant Circuit SiUS341802E 1. Refrigerant Circuit Outdoor Unit No. in Electric piping Name Function symbol diagram Inverter compressor is operated on frequencies between 15 rps to 140 rps by using the Inverter compressor inverter. Refer to page 50, 51. Because the system is an air heat exchange type, the fan is operated at 53 steps of Inverter fan rotation speed by using the inverter.
Page 25 SiUS341802E Refrigerant Circuit RXLQ72TATJU, RXLQ72TAYDU, RXLQ72TAYCU, RXYQ72-120TAYCU Refrigerant Circuit...
Page 26 Refrigerant Circuit SiUS341802E RXLQ96/120TATJU, RXLQ96/120TAYDU, RXLQ96/120TAYCU, RXYQ144/168TAYCU Refrigerant Circuit...
Page 27: Indoor Unit
SiUS341802E Refrigerant Circuit Indoor Unit Symbol No. in piping Except Name Function diagram FXMQ-PB, FXMQ-PB FXTQ-TA FXTQ-TA Used for gas superheated degree control while Electronic expansion in cooling or subcooled degree control while in valve heating. Suction air thermistor R1T (∗1) Used for thermostat control.
Page 28 Refrigerant Circuit SiUS341802E FXDQ-M FXMQ-PB Gas piping Gas piping connection port connection port Liquid piping connection port Indoor heat exchanger Filter Filter Liquid piping connection port Filter Filter C: 4D034245R Indoor heat exchanger C: 4D043864N FXTQ-TA C: 4D068194 Refrigerant Circuit...
Page 29: Outdoor-Air Processing Unit
SiUS341802E Refrigerant Circuit Outdoor-Air Processing Unit FXMQ48/72/96MFVJU Gas pipe connection port Heat exchanger Filter Capillary tube Distributor Solenoid valve Liquid pipe connection port Check valve Filter Filter Electronic expansion valve C: 4D018650D No. in Electric piping Name Function symbol diagram Used to control the flow rate of refrigerant, and make the Electronic expansion valve SH control (∗1) while in cooling.
Page 30: Functional Parts Layout
Functional Parts Layout SiUS341802E 2. Functional Parts Layout RXLQ72TATJU, RXLQ72TAYDU, RXLQ72TAYCU, RXYQ72-120TAYCU Plane View Electronic expansion valve High pressure sensor (Refrigerant cooling) (S1NPH) (Y5E) Solenoid valve (Liquid shutoff) Electronic expansion valve (Y3S) (Subcooling heat exchanger) Solenoid valve (Y2E) (Hot gas bypass) Four way valve (Y2S) (Heat exchanger upper)
Page 31 SiUS341802E Functional Parts Layout Part B Thermistor (Receiver gas purge) (R13T) Electronic expansion valve (Receiver gas purge) (Y7E) Part A detail Thermistor (Leak detection) Thermistor (Subcooling injection) (R15T) (R16T) Electronic expansion valve (Leak detection) (Y6E) Thermistor (Receiver inlet) (R3T) Thermistor (Heat exchanger liquid upper) (R4T) Thermistor...
Page 32 Functional Parts Layout SiUS341802E Back View of Electrical Box Refer to the illustration below for the location of the reactor thermistor (R71T, R72T) for RXLQ72TATJU. Reactor thermistor (R72T) Reactor thermistor (R71T) 1P476849D Refrigerant Circuit...
Page 33: Rxlq96/120Tatju, Rxlq96/120Taydu, Rxlq96/120Taycu, Rxyq144/168Taycu
SiUS341802E Functional Parts Layout RXLQ96/120TATJU, RXLQ96/120TAYDU, RXLQ96/120TAYCU, RXYQ144/168TAYCU Plane View High pressure sensor Electronic expansion valve (S1NPH) (Refrigerant cooling) Solenoid valve (Liquid shutoff) (Y5E) (Y3S) Electronic expansion valve (Subcooling heat exchanger) Solenoid valve (Y2E) (Hot gas bypass) Four way valve (Y2S) (Heat exchanger upper) Solenoid valve (OS oil return)
Page 34 Functional Parts Layout SiUS341802E Electronic expansion valve (Receiver gas purge) (Y7E) Part B Thermistor (Receiver gas purge) (R13T) Part A detail Thermistor (Leak detection) Thermistor (Subcooling injection) (R15T) (R16T) Electronic expansion valve (Leak detection) (Y6E) Thermistor (Receiver inlet) (R3T) Thermistor (Heat exchanger liquid upper) (R4T) Thermistor...
Page 35: Refrigerant Flow For Each Operation Mode
SiUS341802E Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D112615 C: 3D112616 Refrigerant Circuit...
Page 36: Heating Operation
Refrigerant Flow for Each Operation Mode SiUS341802E Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D112615 C: 3D112616 Refrigerant Circuit...
Page 37: Cooling Oil Return Operation
SiUS341802E Refrigerant Flow for Each Operation Mode Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D112615 C: 3D112616 Refrigerant Circuit...
Page 38: Defrost Heating Oil Return Operation
Refrigerant Flow for Each Operation Mode SiUS341802E Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D112615 C: 3D112616 Refrigerant Circuit...
Page 39: Part 3 Remote Controller
SiUS341802E Part 3 Remote Controller 1. Applicable Models ..................27 2. Names and Functions ................28 2.1 BRC1E73 ....................28 2.2 Wireless Remote Controller ............... 31 3. Main/Sub Setting..................32 3.1 BRC1E73 ....................32 3.2 Wireless Remote Controller ............... 33 4. Centralized Control Group No. Setting............34 4.1 BRC1E73 ....................
Page 40: Applicable Models
Applicable Models SiUS341802E 1. Applicable Models Wired remote controller Wireless remote Series controller Navigation FXFQ-T – FXFQ-P BRC082A42W (for BYFQ60C3W1W) FXZQ-TA BRC082A42S (for BYFQ60C3W1S) BRC082A41W (for BYFQ60B3W1) FXZQ-M BRC7E830 FXUQ-P – FXEQ-P FXDQ-M BRC1E73 BRC4C82 FXSQ-TA BRC082A43 FXMQ-PB BRC4C82 FXMQ-M FXHQ-M BRC7E83 FXAQ-P...
Page 41: Names And Functions
SiUS341802E Names and Functions 2. Names and Functions BRC1E73 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button 2.
Page 42 Names and Functions SiUS341802E 4. Up button Used to raise the setpoint. The item above the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.) Used to change the selected item. 5.
Page 43 SiUS341802E Names and Functions Service Check Function
Main Menu • Airflow Direction Airflow Direction • Individual Airflow Direction Individual Airflow Direction • Ventilation Ventilation • Schedule Schedule • Off Timer Off Timer • Celsius / Fahrenheit Celsius / Fahrenheit •...
Page 44: Wireless Remote Controller
Names and Functions SiUS341802E Wireless Remote Controller ON OFF DOWN ON OFF TEMP TIME DOWN RESERVE CANCEL TIMER TEST MODE SWING TEST TEST DISPLAY (SIGNAL TRANSMISSION) FAN SPEED CONTROL BUTTON Press this button to select the fan speed, HIGH or This lights up when a signal is being transmitted.
Page 45: Main/Sub Setting
SiUS341802E Main/Sub Setting 3. Main/Sub Setting BRC1E73 Situation The Main/Sub setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to Main and the other to Sub. Setting The remote controllers are factory setting to Main, so you only have to change one remote controller from Main to Sub.
Page 46: Wireless Remote Controller
Main/Sub Setting SiUS341802E Wireless Remote Controller Introduction To set the wireless remote controller, you have to set the address for: The receiver of the wireless remote controller The wireless remote controller. Setting the Address for the Receiver The address for the receiver of the wireless remote controller is factory setting to 1. To change this setting, proceed as follows: Set the wireless address switch (SS2) on the PCB according to the table below.
Page 47: Centralized Control Group No. Setting
SiUS341802E Centralized Control Group No. Setting 4. Centralized Control Group No. Setting BRC1E73 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No.
Page 48 Centralized Control Group No. Setting SiUS341802E Note: For setting group No. of Energy recovery ventilator and wiring adaptor for other air conditioners, etc., refer to the instruction manual. NOTICE Enter the group No. and installation place of the indoor unit into the installation table. Be sure to keep the installation table with the operation manual for maintenance.
Page 49: Wireless Remote Controller
SiUS341802E Centralized Control Group No. Setting Wireless Remote Controller Group No. setting by wireless remote controller for centralized control 1. When in the normal mode, press INSPECTION/TEST button for 4 seconds or more to enter field setting mode. 2. Set mode No. 00 with MODE button. 3.
Page 50: Group No. Setting Example
Centralized Control Group No. Setting SiUS341802E Group No. Setting Example Outdoor unit Outdoor unit Centralized Remote Controller Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 Group Control by Remote Controller Main...
Page 51: Service Mode
SiUS341802E Service Mode 5. Service Mode BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press and Press the Cancel hold the button. Press the Cancel Cancel button once. button for 4 seconds or more.
Page 52 Service Mode SiUS341802E Maintenance Menu Item 2 Remarks Indoor Unit Status FLOAT Float switch OPEN/CLOSE T1/T2 T1/T2 input from outside OPEN/CLOSE Suction air thermistor Heat exchanger liquid pipe thermistor Heat exchanger gas pipe thermistor Discharge air thermistor — — Outdoor Unit Status Unit No.
Page 53: Part 4 Functions And Control
SiUS341802E Part 4 Functions and Control 1. Operation Flowchart (Outdoor Unit) ............42 2. Stop Control ....................43 2.1 Stop due to Error ..................43 2.2 When System is in Stop Mode ..............43 2.3 Slave Unit Stops during Master Unit Operation.......... 43 3.
Page 54 SiUS341802E 9.7 Freeze-up Prevention................. 79 9.8 List of Swing Flap Operations ..............81 9.9 Hot Start Control (In Heating Only) ............82 9.10 Louver Control for Preventing Ceiling Dirt..........83 9.11 Heater Control (Except FXTQ-TA Models)..........84 9.12 Heater Control (FXTQ-TA Models)............. 85 9.13 3 Step Thermostat Processing (FXTQ-TA Models)........
Page 55: Operation Flowchart (Outdoor Unit)
SiUS341802E Operation Flowchart (Outdoor Unit) 1. Operation Flowchart (Outdoor Unit) For detailed description of each function in the flow below, refer to the details on related function on the following pages. Stop control (1) Stop due to error (2) When system is in stop mode (3) Slave unit stops during master unit operation Special control Standby control...
Page 56: Stop Control
Stop Control SiUS341802E 2. Stop Control Stop due to Error In order to protect compressors, if any of the abnormal state occurs, the system will stop with thermostat OFF and the error will be determined when the retry times reaches certain number. (Refer to "Error Codes and Descriptions"...
Page 57: Standby Control
SiUS341802E Standby Control 3. Standby Control Restart Standby Used to forcedly stop the compressor for a period of 2 minutes, in order to prevent the frequent ON/OFF of the compressor and equalize the pressure within the refrigerant system. In addition, the outdoor fan carry out the residual operation for a while to accelerate pressure equalizing and to suppress condensing of the refrigerant in the evaporator.
Page 58: Startup Control
Startup Control SiUS341802E 4. Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. To avoid stresses to the compressor due to oil return or else after the startup, the following control is made and the position of the four way valve is also determined.
Page 59: Startup Control In Heating
SiUS341802E Startup Control Startup Control in Heating Frequency step up 5 sec. interval +10 rps/10 sec. Frequency RXLQ72TA RXLQ96/120TA (rps) RXYQ72-120TA RXYQ144/168TA 16.4 16.4 Inverter compressor 0 Hz (M1C) PI control Initial opening Electronic expansion 0 pulse valve (main) (Y1E) Step 8 Inverter fan Step 4...
Page 60: Basic Control
Basic Control SiUS341802E 5. Basic Control Normal Operation Function of Functional Part Part Name Electric Symbol Normal Cooling Normal Heating PI control, PI control, High pressure protection, High pressure protection, Inverter compressor Low pressure protection, Low pressure protection, Td protection, Td protection, Inverter protection Inverter protection...
Page 61: Compressor Pi Control
SiUS341802E Basic Control Compressor PI Control Carries out the compressor capacity PI control to maintain Te at constant during cooling operation and Tc at constant during heating operation to ensure stable unit performance. On multi-outdoor-unit systems, this control is made according to values of the first-priority unit, which is detected with the pressure sensor.
Page 62: Operating Priority And Rotation Of Compressors
In the case of multi-outdoor-unit system, each compressor operates in Pattern 1 to Pattern 3 according to the outdoor unit rotation. M1C: Inverter compressor Pattern 1 Pattern 2 Pattern 3 Single Outdoor Unit Aurora series: RXLQ72-120TA Standard series: RXYQ72-168TA No. 1 Double Outdoor Units Aurora series: RXLQ144-240TA Standard series: RXYQ192-336TA No. 1 No.
Page 63: Compressor Step Control
SiUS341802E Basic Control Compressor Step Control Compressor operations vary with the following steps according to information in Compressor PI Control on page 48. Furthermore, the operating priority of compressors is subject to information in Operating Priority and Rotation of Compressors on page 49. Single unit installation RXLQ72TA RXYQ72-120TA...
Page 64 Basic Control SiUS341802E RXLQ96/120TA RXYQ144/168TA Step No. Step No. Step No. Step No. 16.4 24.2 55.7 128.2 RXLQ96TA upper limit 16.5 24.5 56.4 130.0 16.6 24.9 57.2 131.8 16.7 25.2 58.0 133.7 16.8 25.6 58.9 135.6 RXYQ168TA upper limit 16.9 25.9 59.7 137.5...
Page 65: Electronic Expansion Valve Pi Control
SiUS341802E Basic Control Electronic Expansion Valve PI Control Main electronic expansion valve EVM control When the outdoor unit heat exchanging is performed via the condenser (Y5S or Y6S is set to OFF), this function is used to exert PI control on the electronic expansion valve (Y1E or Y3E) so that the condenser outlet subcooled degree (SC) will become constant.
Page 66: Step Control Of Outdoor Fans
Basic Control SiUS341802E Step Control of Outdoor Fans Used to control the revolutions of outdoor fans in the steps listed in table below, according to condition changes. Standard (default) Step X Cooling Heating Step No. Cooling Heating RXLQ72TA RXLQ96TA RXLQ120TA RXYQ72TA RXYQ96TA RXYQ120TA...
Page 67: Protection Control
SiUS341802E Protection Control 6. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure.
Page 68 Protection Control SiUS341802E Heating Normal Operation < 3.17 MPa > 3.31 MPa (460 psi) (480 psi) Pc: High pressure sensor detection value for master > 3.39 MPa unit (492 psi) All units Compressor step: 1 9-step down After 10 After 10 seconds >...
Page 69: Low Pressure Protection Control
SiUS341802E Protection Control Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. Cooling Normal Operation < 0.25 MPa > 0.39 MPa (36.3 psi) (56.6 psi) Pe: Low pressure sensor detection value for master unit All compressors step: 1...
Page 70: Discharge Pipe Protection Control
Protection Control SiUS341802E Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against an error or transient increase of discharge pipe temperature. HTdi : Value of inverter compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature : Compressor body temperature : Maximum of HTdi and Ti X(˚C)(Y(˚F)): RXLQ72TA, RXYQ72-120TA...
Page 71: Compressor Body Protection Control
SiUS341802E Protection Control Compressor Body Protection Control This compressor body protection control is used to protect the compressor internal temperature against an error or transient increase of compressor body temperature. Contents The following control is performed for each compressor of single unit as well as multi units. Inverter compressor Normal operation Compressor body...
Page 72 Protection Control SiUS341802E Radiation fin temperature control Perform the following control of integrated as well as multi units for each inverter compressor. Normal operation Reduce compressor capacity When occurring 4 times within 60 Fin temperature standby minutes, the error code L4 is output. RXLQ72TAYCU Condition RXLQ72TATJU...
Page 73: Special Control
SiUS341802E Special Control 7. Special Control Pump Down Residual Operation Pc : High pressure sensor detection value Pe : Low pressure sensor detection value Ta : Outdoor air temperature Te : Low pressure equivalent saturation temperature DSH : Discharge pipe superheated degree If the liquid refrigerant stays in the evaporator at the startup of a compressor, this liquid refrigerant enters the compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance.
Page 74: Oil Return Operation
Special Control SiUS341802E Oil Return Operation In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil that has flowed out from the compressor to the system side. Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature TsA: Suction pipe temperature detected by thermistor R3T 7.2.1 Oil Return Operation in Cooling Operation...
Page 75 SiUS341802E Special Control 7.2.2 Oil Return Operation in Heating Operation Starting conditions Part Name Electric Symbol Oil return operation +1 to +6 steps from frequency to frequency when oil return is IN Inverter compressor at a constant level Inverter fan M1F, M2F Same as normal operation Electronic expansion valve (Heat...
Page 76: Defrost Operation
Special Control SiUS341802E Defrost Operation To defrost the outdoor heat exchanger while in Evaporator, the defrost operation is conducted to recover the heating capacity. Tb: Heat exchanger deicer temperature Part Name Electric Symbol Defrost operation RXLQ72TA, RXYQ72-120TA: 134 rps Inverter compressor RXLQ96/120TA, RXYQ144/168TA: 119 rps With high pressure Inverter fan...
Page 77: Outdoor Unit Rotation
SiUS341802E Special Control Outdoor Unit Rotation In the case of multi outdoor unit system, this outdoor unit rotation prevents the compressor from breaking down due to unbalanced oil level between outdoor units. Details of outdoor unit rotation In the case of multi outdoor unit system, each outdoor unit is given an operating priority for the control.
Page 78: Other Control
Other Control SiUS341802E 8. Other Control Backup Operation If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit from operating, and then conduct emergency operation only with operational compressors or outdoor units. "Emergency operation with remote controller reset" and "Emergency operation with outdoor unit PCB setting"...
Page 79: Heating Operation Prohibition
SiUS341802E Other Control Heating Operation Prohibition When outdoor air temperature is too high, outdoor unit cannot operate in heating mode because: Low pressure sensor can give pressure value above upper limit of sensor: error JC. Mechanical internal load on compressor increases. Low compression ratio can result in insufficient compressor internal oil lubrication.
Page 80: Outline Of Control (Indoor Unit)
Outline of Control (Indoor Unit) SiUS341802E 9. Outline of Control (Indoor Unit) Operation Flowchart Cooling Operation Start (Option) Turn ON Aux. electric : OFF ∗16 power supply heater Humidifier : OFF Initialize electronic expansion valve Swing flap Detect louver lock prevention condition? The previous settings of airflow LED in remote...
Page 81 SiUS341802E Outline of Control (Indoor Unit) Program dry operation Heating Operation (option) Program ∗7 dry display Drain : OFF pump kit ∗8 Thermostat status : Operating in L mode after it stops for 6 min. Operating in L mode Swing flap? Electronic YE : expansion valve...
Page 82: Set Temperature And Control Temperature
Outline of Control (Indoor Unit) SiUS341802E Set Temperature and Control Temperature 9.2.1 Without Optional Infrared Presence/Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. • When the suction air thermistor is used for controlling (Default), the control target temperature is determined as follows to prevent insufficient heating in heating operation.
Page 83 SiUS341802E Outline of Control (Indoor Unit) 9.2.2 With Optional Infrared Presence/Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. The temperature difference for cooling ⇔ heating mode switching is 5°C (9°F). • • When using the floor temperature as the control target, the remote controller set temperature is equal to the actual control target temperature in heating operation.
Page 84: Remote Controller Thermistor
Outline of Control (Indoor Unit) SiUS341802E Remote Controller Thermistor Temperature is controlled by both the remote controller thermistor and suction air thermistor for the indoor unit. (This is however limited to when the field setting for the remote controller thermistor is set to Use.) Note: When outdoor air is introduced to the air-conditioner with mixed into indoor air, the room...
Page 85 SiUS341802E Outline of Control (Indoor Unit) Heating When heating, the hot air rises to the top of the room, resulting in the temperature being lower near the floor where the occupants are. When controlling by suction air thermistor only, the indoor unit may therefore be turned off by the thermostat before the lower part of the room reaches the set temperature.
Page 86: Thermostat Control
Outline of Control (Indoor Unit) SiUS341802E Thermostat Control 9.4.1 Without Optional Infrared Presence/Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the actual detected room temperature (∗1). Normal operation ·...
Page 87 SiUS341802E Outline of Control (Indoor Unit) 9.4.2 With Optional Infrared Presence/Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the detected temperature around people. Normal operation · Cooling operation ∆T ≤...
Page 88 Outline of Control (Indoor Unit) SiUS341802E 9.4.3 Thermostat Control with Operation Mode Set to "AUTO" When the operation mode is set to AUTO on the remote controller, the system will conduct the temperature control shown below. Furthermore, setting changes of the differential value (D) can be made referring to page 92 and later (Field Settings from Remote Controller).
Page 89: Drain Pump Control
SiUS341802E Outline of Control (Indoor Unit) Drain Pump Control 9.5.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min. • The float switch is ON in normal operation. • When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. •...
Page 90 Outline of Control (Indoor Unit) SiUS341802E 9.5.3 If the Float Switch is OFF with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. • When the float switch turns OFF, the drain pump turns ON simultaneously. •...
Page 91: Control Of Electronic Expansion Valve
SiUS341802E Outline of Control (Indoor Unit) Control of Electronic Expansion Valve Electronic expansion valves in indoor units have the functions of conducting superheated degree control in cooling operation and subcooling degree control in heating operation. However, if the indoor units receive any control command such as a protection control command or a special control command from the outdoor unit, the units will give a priority to the control command.
Page 92: Freeze-Up Prevention
Outline of Control (Indoor Unit) SiUS341802E Freeze-up Prevention Freeze-up Prevention by Off Cycle (Indoor Unit) When the temperature detected by the liquid pipe temperature thermistor of the indoor heat exchanger drops too low, the unit enters freeze-up prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below.
Page 93 SiUS341802E Outline of Control (Indoor Unit) Note: When the indoor unit is FXFQ, FXZQ or FXUQ, if the air outlet is set as dual-directional or tri- directional, the starting conditions will be changed as follows. Liquid pipe temperature ≤ 1°C (33.8°F) (for total of 15 minutes) Liquid pipe temperature ≤...
Page 94: List Of Swing Flap Operations
Outline of Control (Indoor Unit) SiUS341802E List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXFQ FXEQ FXHQ FXAQ Swing Horizontal Horizontal Horizontal Horizontal Hot start from defrost operation Airflow direction set Horizontal Horizontal Horizontal Horizontal Swing Horizontal...
Page 95: Hot Start Control (In Heating Only)
SiUS341802E Outline of Control (Indoor Unit) Hot Start Control (In Heating Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor fan is controlled to prevent cold air from blasting out and ensure startup capacity. TH2: Temperature detected with the gas thermistor Tc : High pressure equivalent saturated temperature Starting condition...
Page 96: Louver Control For Preventing Ceiling Dirt
Outline of Control (Indoor Unit) SiUS341802E 9.10 Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.
Page 97: Heater Control (Except Fxtq-Ta Models)
SiUS341802E Outline of Control (Indoor Unit) 9.11 Heater Control (Except FXTQ-TA Models) Note: Optional PCB KRP1B ... is required. The heater control is conducted in the following manner. Normal control While in heating, the heater control (ON/ Set temperature OFF) is conducted as shown on the right. 2˚C 2˚C (3.6˚F)
Page 98: Heater Control (Fxtq-Ta Models)
Outline of Control (Indoor Unit) SiUS341802E 9.12 Heater Control (FXTQ-TA Models) Note: Optional heater kit HKS... is required. For FXTQ models, heater ON/OFF output from wiring adaptor interlocks with the operation of heater kit HKS….(When the heater 1 turns ON/OFF, heater output of wiring adaptor turns ON/OFF.) Fan residual operation also interlocks with the fan residual operation of heater kit HKS….
Page 99 SiUS341802E Outline of Control (Indoor Unit) Condition A • No fan motor system error • High pressure condition: ON (∗1) • Liquid pipe temperature condition: ON (∗2) • Heater ON permission (Defrost/oil Return): 0 (∗4) & & • Not during defrost/oil return •...
Page 100 Outline of Control (Indoor Unit) SiUS341802E 9.12.2 Heat Pump Lockout Control For heating operation, users can select to use electric heater. For this, signals are sent using ABC terminal of outdoor unit PCB. When the hot-water heating signal is received from the outdoor unit PCB, heating operation is performed only with the electric heater as manual backup operation.
Page 101: Step Thermostat Processing (Fxtq-Ta Models)
SiUS341802E Outline of Control (Indoor Unit) 9.13 3 Step Thermostat Processing (FXTQ-TA Models) Outline The thermostat ON/OFF for the indoor unit is controlled in accordance with [Thermostat Step 1]. The heater ON/OFF operation during heating is controlled as follows. Thermostat step 2, 3: Auxiliary electric heater control Thermostat step 1, 2: Heat pump lockout control For more details of the heater, refer to Heater Control (FXTQ-TA Models) on page 85.
Page 102: Fan Control (Heater Residual) (Fxtq-Ta Models)
Outline of Control (Indoor Unit) SiUS341802E 9.14 Fan Control (Heater Residual) (FXTQ-TA Models) Outline If the indoor heater turned OFF from ON during heating operation, the fan will keep operating for further period of time in order to cool the heater. Detail Residual ON •...
Page 103 SiUS341802E Outline of Control (Indoor Unit) 9.15.3 Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer.
Page 104: Part 5 Field Settings And Test Operation
SiUS341802E Part 5 Field Settings and Test Operation 1. Field Settings from Remote Controller ............92 1.1 Wired Remote Controller................92 1.2 Wireless Remote Controller ............... 94 1.3 Simplified Remote Controller..............95 1.4 List of Field Settings for Indoor Unit ............96 1.5 Details of Field Settings for Indoor Unit............
Page 105: Field Settings From Remote Controller
SiUS341802E Field Settings from Remote Controller 1. Field Settings from Remote Controller Individual function of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the field setting in accordance with the following description. Wrong setting may cause error.
Page 106 Field Settings from Remote Controller SiUS341802E Press Menu/OK button. Setting confirmation screen is displayed. Select Yes and press Menu/OK button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repeat “ ”...
Page 107: Wireless Remote Controller
SiUS341802E Field Settings from Remote Controller Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button To set the field settings, you have to change: Mode No. First code No.
Page 108: Simplified Remote Controller
Field Settings from Remote Controller SiUS341802E Simplified Remote Controller Mode No. First code Unit No. Second code No. (2)(8) (7) (4) (5) (6) 1. Remove the upper part of remote controller. 2. When in the normal mode, press the BS6 button (2) (field setting) to enter the field setting mode. 3.
Page 109: List Of Field Settings For Indoor Unit
SiUS341802E Field Settings from Remote Controller List of Field Settings for Indoor Unit : Factory setting Mode First Second Code No. Code Setting Contents (∗2) Approx. Approx. Ultra long life 10,000 5,000 Filter sign setting filter hrs. hrs. (Setting for display time to clean air filter) Approx.
Page 110 Field Settings from Remote Controller SiUS341802E Mode First Second Code No. Code Setting Contents (∗2) Setting of airflow rate Standard High ceiling 1 High ceiling 2 — Airflow direction setting F (4 directions) T (3 directions) — (Set when a blocking pad kit has been installed.) (2 directions) All direction Swing pattern settings...
Page 111 SiUS341802E Field Settings from Remote Controller Applicable Range of Field Setting Ceiling mounted cassette type 4-way blow One way Slim Ceiling mounted Ceiling Wall Floor Concealed ceiling blow ceiling duct type suspended mounted standing floor handling Round suspended cassette mounted type type type...
Page 112: Details Of Field Settings For Indoor Unit
Field Settings from Remote Controller SiUS341802E Details of Field Settings for Indoor Unit Filter Sign Setting If switching the filter sign ON time, set as given in the table below. First Code Second Standard Long Life Ultra Long Life Mode No. Contents Code No.
Page 113 SiUS341802E Field Settings from Remote Controller (˚F) (˚C) 96.8 93.2 In cooling 89.6 Suction air Remote controller Suction air thermistor thermistor thermistor Suction air Suction air Remote controller 82.4 thermistor thermistor thermistor 78.8 75.2 71.6 (˚C) 62.6 66.2 69.8 73.4 80.6 84.2 87.8 91.4 98.6 (˚F)
Page 114 Field Settings from Remote Controller SiUS341802E Filter Cleaning Sign Whether or not to display "Filter Cleaning" after operation of certain duration can be selected. Mode No. First Code No. Second Code No. Contents Displayed 10 (20) Not displayed ∗ Filter cleaning sign is not displayed when an Auto-clean Panel is connected. Time for Absence Area Detection (For units with an infrared presence/floor sensor only) By selecting the energy-saving operation mode in the absence, the target temperature is shifted to the energy-...
Page 115 SiUS341802E Field Settings from Remote Controller Auxiliary Electric Heater ON/OFF Temperature Thermostat Set temperature Thermostat Toff + S (∗1) Ton + S (∗1) Note: ∗1. S value varies automatically based on the room temperature trend. FXFQ-T, FXMQ-PB Second Code No. Mode No.
Page 116 Field Settings from Remote Controller SiUS341802E Setting the Airflow Rate when Heating The fan revolution is changed to maintain the sufficient distance for warm air to reach during the heating operation. The setting should be changed depending on the installation condition of the unit. Second Code No.
Page 117 SiUS341802E Field Settings from Remote Controller Setting the Rate of Human Detection (For units with the infrared presence/floor sensor only) Set the sensitivity of the infrared presence sensor. • The infrared presence sensor can be disabled by selecting the Second code No. 04. (Note) When the infrared presence sensor is disabled, the remote controller menu does not display some functions such as the automatic draft reduction, energy-saving operation in absence and halt in absence.
Page 118 Field Settings from Remote Controller SiUS341802E Compensating the Floor Temperature (For units with the infrared presence/floor sensor only) Offset the detected value of the infrared floor sensor with a certain temperature. This setting should be used to have the actual floor temperature detected when, for example, the unit is installed close to a wall. Mode No.
Page 119 SiUS341802E Field Settings from Remote Controller Thermostat Switching Differential value during thermostat ON/OFF control can be changed. Mode No. First Code No. Second Code No. Contents 1°C (1.8°F) 12(22) 0.5°C (0.9°F) Airflow Setting when Heating Thermostat is OFF This setting is used to set airflow when heating thermostat is OFF. ∗...
Page 120 Field Settings from Remote Controller SiUS341802E Setting of Airflow Rate Make the following setting according to the ceiling height. The second code No. is set to 01 at the factory. FXHQ, FXAQ Mode No. First Code No. Second Code No. Contents Standard 13 (23)
Page 121 SiUS341802E Field Settings from Remote Controller Operation of Downward Flow Flap (for FXEQ model) When only the front-flow is used, sets yes/no of the swing flap operation of down-flow Model No. First Code No. Second Code No. Contents Equipped 13 (23) Not equipped Setting of Airflow Direction Adjustment Range Make the following airflow direction setting according to the respective purpose.
Page 122 Field Settings from Remote Controller SiUS341802E FXSQ-TA model Mode No. First Code No. Second Code No. Contents 30 Pa (0.12 inWG) (∗1) (∗2) 40 Pa (0.16 inWG) (∗1) (∗2) 50 Pa (0.20 inWG) 60 Pa (0.24 inWG) 70 Pa (0.28 inWG) 80 Pa (0.32 inWG) 13 (23) 90 Pa (0.36 inWG)
Page 123 Second Code No. Contents Not individual 15 (25) Individual Display of Contact Center (For BRC1E73 only) You can turn OFF the display of "DAIKIN Contact Center" as "Contact for Service Display." Mode No. First Code No. Second Code No. Contents Displayed...
Page 124 Field Settings from Remote Controller SiUS341802E Key-lock Pattern Settings (For BRC1E73 only) Setting of key-lock pattern for the remote controller Mode No. First Code No. Second Code No. Contents No operation allowed (Cancel procedure is displayed.) No operation allowed (Cancel procedure is not displayed.) No menu operation is allowed.
Page 125: List Of Field Settings For Outdoor-Air Processing Unit
SiUS341802E Field Settings from Remote Controller List of Field Settings for Outdoor-Air Processing Unit : Factory setting First Second Code No. Mode Setting Contents Code Filter contamination 2500 hr 1250 hr — — — — — — — — — —...
Page 126 Field Settings from Remote Controller SiUS341802E How to Select Operation Mode Whether operation by remote controller will be possible or not for turning ON/OFF, controlling temperature or setting operation mode is selected and decided by the operation mode given on the right edge of the table below. Example ON by remote OFF by remote...
Page 127: Field Setting From Outdoor Unit
SiUS341802E Field Setting from Outdoor Unit 2. Field Setting from Outdoor Unit To continue the configuration of the VRV IV heat pump system, it is required to give some input to the logic board of the unit. This chapter will describe how manual input is possible by operating the BS buttons/DIP switches on the logic board and reading the feedback from the 7 segment displays.
Page 128 Field Setting from Outdoor Unit SiUS341802E 2.1.2 When Mounting a Spare PCB Caution: After replacement with spare PCB, be sure to make settings shown in the table on the following page. The procedure for making settings of spare PCB is different from that used for factory settings described above.
Page 129 SiUS341802E Field Setting from Outdoor Unit The figure below shows the required position of the DIP switches on spare PCB for RXLQ-TA and RXYQ-TA. Change DIP switches at time of power disconnected. Application model The setting method ( represents the position of switches) RXLQ72TA Set DS2-2 to ON.
Page 130: Accessing The Bs Buttons On The Logic Board
Field Setting from Outdoor Unit SiUS341802E Accessing the BS Buttons on the Logic Board It is not required to open the complete electronic component box to access the BS buttons on the logic board and read out the 7 segment display(s). To access you can remove the front plate (see figure).
Page 131: Operating The Bs Buttons And Dip Switches On The Logic Board
SiUS341802E Field Setting from Outdoor Unit Operating the BS Buttons and DIP Switches on the Logic Board Operating the BS buttons By operating the BS buttons it is possible to: • Perform special actions (testrun, etc). • Perform field settings (demand operation, low noise, etc). Below procedure explains how to operate the BS buttons to reach the required mode in the menu, select the correct setting and modify the value of the setting.
Page 132 Field Setting from Outdoor Unit SiUS341802E Accessing modes BS1 is used to change the mode you want to access. • Access mode 1 Press BS1 once. Segment indication changes to: • Access mode 2 Press BS1 for at least 5 seconds. Segment indication changes to: INFORMATION If you get confused in the middle of the process, press BS1.
Page 133: Connecting Of The Optional Pc Configurator Cable To The Outdoor Unit
SiUS341802E Field Setting from Outdoor Unit Example: Checking the content of parameter [2-18] (to define the high static pressure setting of the outdoor unit fan). Mode: 2 Setting: 18 • Make sure the segment indication is as during normal operation (default situation when shipped from factory). •...
Page 134: Monitoring Function And Field Settings
Field Setting from Outdoor Unit SiUS341802E Monitoring Function and Field Settings The operation of the outdoor unit can further be defined by changing some field settings. Next to making field settings it is also possible to confirm the current operation parameters of the unit. The setting can also be performed via the PC configuration software.
Page 135 SiUS341802E Field Setting from Outdoor Unit [1-5]: shows the current Te target parameter position. [1-6]: shows the current Tc target parameter position [1-10]: shows the total number of connected indoor units It can be convenient to check if the total number of indoor units which are installed match the total number of indoor units which are recognized by the system.
Page 136 Field Setting from Outdoor Unit SiUS341802E [2-1]: Cool/heat unified address Address for cool/heat unified operation. When multiple heat pump systems need to change over together between cooling and heating (example multiple systems serve indoor units in landscape area). Per zone the optional PCB DTA104A61/62 needs to be installed.
Page 137 SiUS341802E Field Setting from Outdoor Unit [2-8]: Te target temperature during cooling operation Value Te target [2-8] 0 (default) Auto 6°C (42.8°F) 7°C (44.6°F) 8°C (46.4°F) 9°C (48.2°F) 10°C (50°F) 11°C (51.8°F) [2-9]: Tc target temperature during heating operation Value Tc target [2-9] 0 (default)
Page 138 Field Setting from Outdoor Unit SiUS341802E [2-20]: Manual additional refrigerant charge In order to add the additional refrigerant charge amount in a manual way (without automatic refrigerant charging functionality), following setting should be applied. Default value: 0 To activate this function: 1 To stop the manual additional refrigerant charge operation (when the required additional refrigerant amount is charged), press BS3.
Page 139 SiUS341802E Field Setting from Outdoor Unit [2-27]: Night-time low noise operation stop time Value Start time automatic night-time low noise [2-27] operation (approximately) 6:00 AM 7:00 AM 3 (default) 8:00 AM This setting is used in conjunction with setting [2-22]. [2-28]: Power transistor check mode To evaluate the output of the power transistors.
Page 140 Field Setting from Outdoor Unit SiUS341802E Next time graph shows the different steps during the power transistor check mode. Switching sequence during power transistor check mode: Disconnect UVW from compressor before performing the power transistor check. Step 2: Voltage Mode 2-28 Check 4 output Magnectic...
Page 141 SiUS341802E Field Setting from Outdoor Unit When operation parameters return to normal range, the capacity priority is switched OFF, enable to reduce airflow rate depending on night-time low noise operation is still required (end time for night-time low noise operation is not reached or external input night-time low noise operation is still closed). If capacity priority is set in Operation capacity priority setting, the fan...
Page 142 Field Setting from Outdoor Unit SiUS341802E [2-32]: Forced, all time, power consumption limitation operation (no external control adaptor is required to perform power consumption limitation) If the system always needs to be running under power consumption limitation conditions, this setting activates and defines the level power consumption limitation that will be applied continuously.
Page 143 SiUS341802E Field Setting from Outdoor Unit [2-35]: Height difference setting Default value: 1 In case the outdoor unit is installed in the lowest position (indoor units are installed on a higher position than outdoor units) and the height difference between the highest indoor unit and the outdoor unit exceeds 40 m (131 ft), the setting [2-35] should be changed to 0.
Page 144 Field Setting from Outdoor Unit SiUS341802E Automatic lockout When this setting is made, the auto-backup function will automatically be activated. This will allow the auxiliary or secondary heat source to be automatically energized in the event of a system failure related to outdoor units.
Page 145 SiUS341802E Field Setting from Outdoor Unit [2-38]: Emergency operation “Master” To disable permanent compressor operation: in case of single module or “Master” unit of a multi outdoor system, this setting allows: Default value: 0. Compressor operation enabled. Field setting: Set 1 or 3: compressor in this “Master” module is disabled permanent. [2-39]: Emergency operation “Slave 1”...
Page 146 Field Setting from Outdoor Unit SiUS341802E [2-60]: Gas furnace setting Default value: 0. When a gas furnace is connected, the setting [2-60] has to be changed to 1. [2-78]: Heat pump lockout temperature Heat pump is locked out when the outdoor air temperature is smaller than the heat pump lockout temperature.
Page 147 SiUS341802E Field Setting from Outdoor Unit [2-89]: Intermittent fan drive setting To prevent snow accumulation on the fan grille, fan is turned on intermittently when outdoor air temperature is low. Value Intermittent fan Fan OFF time Fan ON time Fan speed [2-89] drive setting (min)
Page 148 Field Setting from Outdoor Unit SiUS341802E [2-97]: Auxiliary heater maximum allowable temperature Auxiliary heater is allowed to energize when the outdoor air temperature is smaller than the auxiliary heater maximum allowable temperature. Value Auxiliary heater maximum allowable [2-97] temperature –17.7°C (0°F) –15°C (5°F) –12.2°C (10°F) –9.4°C (15°F)
Page 149: Setting Of Night-Time Low Noise Operation And Demand Operation
SiUS341802E Field Setting from Outdoor Unit Setting of Night-time Low Noise Operation and Demand Operation Setting of Night-time Low Noise Operation By connecting the external contact input to the low noise input of the outdoor unit external control adaptor (optional), you can lower operating noise. Setting Content Level 1...
Page 150 Field Setting from Outdoor Unit SiUS341802E Image of operation in the case of A Operation If capacity priority is set in sound Capacity priority setting, the fan speed will be increased according to the load of air conditioning when load is heavier. Operation sound Rated during low noise...
Page 151 SiUS341802E Field Setting from Outdoor Unit Setting of Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition.
Page 152 Field Setting from Outdoor Unit SiUS341802E B. When the Normal demand operation is carried out. (Use of the external control adaptor for outdoor unit is not required.) 1. While in setting mode 2, set the item 2-32 (Setting of alternate demand) to ON. 2.
Page 153 SiUS341802E Field Setting from Outdoor Unit Image of operation in the case of A and B The power Power consumption consumption can be set with the Demand 1 level setting. (70 % of rated power Rated consumption has been set at factory.) 70 % The power consumption set with...
Page 154: Test Operation
Test Operation SiUS341802E 3. Test Operation Checks before Test Operation Before carrying out a test operation, proceed as follows: Step Action Make sure the voltage at the primary side of the safety breaker is: 187 - 253 V (-TATJU) 416 - 508 V (-TAYDU) 518 - 632 V (-TAYCU) Fully open the liquid and the gas stop valve.
Page 155: Part 6 Service Diagnosis
SiUS341802E Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............145 1.1 Indoor Unit Overall ................... 145 1.2 With Optional Infrared Presence/Floor Sensor......... 148 1.3 Wired Remote Controller................149 1.4 Wireless Remote Controller ..............150 1.5 Error Codes and Descriptions ..............152 1.6 Error Codes - Sub Codes .................
Page 156 SiUS341802E 2.34 Electronic Expansion Valve Coil Abnormality........... 219 2.35 Discharge Pipe Temperature Abnormality ..........220 2.36 Wet Alarm....................222 2.37 Refrigerant Overcharged................223 2.38 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB).................... 224 2.39 Outdoor Fan Motor Signal Abnormality ............ 225 2.40 Outdoor Fan PCB Abnormality..............
Page 157 SiUS341802E 3.5 Refrigerant Overcharge Check..............291 3.6 Refrigerant Shortage Check..............292 3.7 Vacuuming and Dehydration Procedure ..........293 3.8 Thermistor Check ..................294 3.9 Pressure Sensor Check ................297 3.10 Broken Wire Check of the Relay Wires ............ 298 3.11 Fan Motor Connector Check (Power Supply Cable) ........ 299 3.12 Fan Motor Connector Check (Signal Cable) ..........
Page 158: Symptom-Based Troubleshooting
Symptom-based Troubleshooting SiUS341802E 1. Symptom-based Troubleshooting Indoor Unit Overall Symptom Supposed Cause Countermeasure The system does not start operation at all. Blowout of fuse(s) Turn Off the power supply and then replace the fuse(s). Cutout of breaker(s) • If the knob of any breaker is in its OFF position, turn ON the power supply.
Page 159 SiUS341802E Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure COOL/HEAT The remote controller displays This remote controller has no option Use a remote controller with option to select cooling operation. to select cooling operation. selection is UNDER CENTRALIZED disabled. CONTROL. The remote controller displays COOL/HEAT selection is made Use the COOL/HEAT selection using the COOL/HEAT selection...
Page 160 Symptom-based Troubleshooting SiUS341802E Symptom Supposed Cause Countermeasure 11 The system Indoor unit These are operating sounds of the Normal operation. produces Immediately after turning ON electronic expansion valve of the This sound becomes low after a sounds. the power supply, indoor unit indoor unit.
Page 161: With Optional Infrared Presence/Floor Sensor
SiUS341802E Symptom-based Troubleshooting With Optional Infrared Presence/Floor Sensor Condition Measure 1 "Louver operation different from setting" or "No downward Refer to the following table. airflow in heating operation" 2 Individual airflow direction setting different from the actual · Check the "Louver operation different from setting" error airflow direction diagnosis.
Page 162: Wired Remote Controller
Symptom-based Troubleshooting SiUS341802E Wired Remote Controller The following will be displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Screen Operation lamp (1) Check if it is an error or warning.
Page 163: Wireless Remote Controller
SiUS341802E Symptom-based Troubleshooting Wireless Remote Controller If the unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit blinks. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
Page 164 Symptom-based Troubleshooting SiUS341802E The lower digit of the code changes as shown below. 0 1 2 3 4 5 6 7 8 9 A H C J E F "UP" button "DOWN" button Continuous beep : Both upper and lower digits match. (Error code is confirmed.) 2 short beeps : The upper digit matches but the lower digit does not.
Page 165: Error Codes And Descriptions
SiUS341802E Symptom-based Troubleshooting Error Codes and Descriptions k: ON h: OFF l: Blink Error code Operation Error contents Reference lamp page Indoor Unit External protection device abnormality Indoor unit PCB abnormality Drain level control system abnormality Indoor fan motor lock, overload Indoor fan motor abnormality Overload/overcurrent/lock of indoor fan motor Blower motor not running...
Page 166 Symptom-based Troubleshooting SiUS341802E k: ON h: OFF l: Blink Error code Operation Error contents Reference lamp page Outdoor Unit Subcooling heat exchanger gas pipe thermistor (R6T) abnormality Receiver gas purge thermistor (R13T) abnormality High pressure sensor abnormality Low pressure sensor abnormality Inverter PCB abnormality Momentary power failure during test operation Reactor temperature rise abnormality...
Page 167: Error Codes - Sub Codes
SiUS341802E Symptom-based Troubleshooting Error Codes - Sub Codes If an error code like the one shown below is displayed when the navigation remote controller (BRC1E series) is in use, make a detailed diagnosis or a diagnosis of the relevant unit. 1.6.1 Indoor Unit Troubleshooting Error code...
Page 168 Symptom-based Troubleshooting SiUS341802E 1.6.2 Outdoor Unit Troubleshooting Error code Description of error Description of diagnosis E1 - 01 Outdoor unit PCB error Refer to the E1 flowchart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left. E1 - 02 Defective outdoor unit PCB E2 - 01...
Page 169 SiUS341802E Symptom-based Troubleshooting Troubleshooting Error code Description of error Description of diagnosis E7 - 01 Fan motor M1F lock (Master) E7 - 02 Fan motor M2F lock (Master) Fan motor M1F momentary overcurrent E7 - 05 (Master) Fan motor M2F momentary overcurrent E7 - 06 (Master) E7 - 09...
Page 170 Symptom-based Troubleshooting SiUS341802E Troubleshooting Error code Description of error Description of diagnosis E9 - 01 Electronic expansion valve coil (Y1E) error (Master) E9 - 03 Electronic expansion valve coil (Y2E) error (Master) E9 - 04 Electronic expansion valve coil (Y3E) error (Master) Electronic expansion valve coil (Y1E) error E9 - 05 (Slave 1)
Page 171 SiUS341802E Symptom-based Troubleshooting Troubleshooting Error code Description of error Description of diagnosis F3 - 01 Discharge pipe high temperature error (Master) F3 - 03 Discharge pipe high temperature error (Slave 1) F3 - 05 Discharge pipe high temperature error (Slave 2) Refer to the F3 flowchart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left.
Page 172 Symptom-based Troubleshooting SiUS341802E Troubleshooting Error code Description of error Description of diagnosis Defective discharge pipe thermistor (R21T): J3 - 16 Open (Master) Defective discharge pipe thermistor (R21T): J3 - 17 Short (Master) Defective discharge pipe thermistor (R21T): J3 - 22 Open (Slave 1) Defective discharge pipe thermistor (R21T): J3 - 23...
Page 173 SiUS341802E Symptom-based Troubleshooting Troubleshooting Error code Description of error Description of diagnosis Defective heat exchanger deicer thermistor J6 - 01 (R11T) (Master) Defective heat exchanger deicer thermistor J6 - 02 (R11T) (Slave 1) Defective heat exchanger deicer thermistor J6 - 03 (R11T) (Slave 2) Defective heat exchanger gas upper thermistor J6 - 08...
Page 174 Symptom-based Troubleshooting SiUS341802E Troubleshooting Error code Description of error Description of diagnosis Defective heat exchanger liquid upper J8 - 01 thermistor (R4T) (Master) Defective heat exchanger liquid upper J8 - 02 thermistor (R4T) (Slave 1) Defective heat exchanger liquid upper J8 - 03 thermistor (R4T) (Slave 2) Defective heat exchanger liquid lower...
Page 175 SiUS341802E Symptom-based Troubleshooting Troubleshooting Error code Description of error Description of diagnosis L1 - 01 IPM error: Inverter compressor M1C (Master) Defective current sensor 1: Inverter compressor L1 - 02 M1C (Master) Defective current sensor 2: Inverter compressor L1 - 03 M1C (Master) L1 - 04 IGBT error: Inverter compressor M1C (Master)
Page 176 Symptom-based Troubleshooting SiUS341802E Troubleshooting Error code Description of error Description of diagnosis Momentary power failure during test operation L2 - 01 (Master) Momentary power failure during test operation L2 - 02 (Slave 1) Refer to the L2 flowchart of each manual and make a diagnosis Momentary power failure during test operation L2 - 03 of the relevant unit based on the Error code shown to the left.
Page 177 SiUS341802E Symptom-based Troubleshooting Troubleshooting Error code Description of error Description of diagnosis Transmission error (Between outdoor units, LC - 14 inverter PCB) (Master) Transmission error (Between outdoor units, LC - 15 inverter PCB) (Slave 1) Transmission error (Between outdoor units, LC - 16 inverter PCB) (Slave 2) Transmission error (Between outdoor units, fan...
Page 178 Symptom-based Troubleshooting SiUS341802E Troubleshooting Error code Description of error Description of diagnosis PJ - 04 Incorrect type of inverter PCB (Master) PJ - 05 Incorrect type of inverter PCB (Slave 1) PJ - 06 Incorrect type of inverter PCB (Slave 2) PJ - 09 Incorrect type of fan PCB (Master): M1F Refer to the PJ flowchart of each manual and make a diagnosis...
Page 179 SiUS341802E Symptom-based Troubleshooting Troubleshooting Error code Description of error Description of diagnosis Transmission error between indoor and outdoor U4 - 01 units Refer to the U4 flowchart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left. Transmission error between indoor unit and U4 - 03 system...
Page 180: Troubleshooting By Error Code
Troubleshooting by Error Code SiUS341802E 2. Troubleshooting by Error Code External Protection Device Abnormality 2.1.1 External Protection Device Abnormality (All Indoor Unit Models) Error Code Applicable All indoor unit models Models Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals with the remote controller set to...
Page 181 SiUS341802E Troubleshooting by Error Code 2.1.2 External Protection Device Abnormality (FXTQ-TA Only) A0-01 Error Code Applicable FXTQ-TA Models Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals. Conditions Supposed Actuation of external protection device...
Page 182: Indoor Unit Pcb Abnormality
Troubleshooting by Error Code SiUS341802E Indoor Unit PCB Abnormality Error Code Applicable All indoor unit models Models Method of Error Check data from EEPROM. Detection Error Decision When data could not be correctly received from the EEPROM Conditions EEPROM : Type of nonvolatile memory. Maintains memory contents even when the power supply is turned OFF.
Page 183: Drain Level Control System Abnormality
SiUS341802E Troubleshooting by Error Code Drain Level Control System Abnormality Error Code Applicable FXFQ, FXZQ, FXUQ, FXEQ, FXDQ, FXSQ-TA, FXMQ-PB Models Method of Error By float switch OFF detection Detection Error Decision When rise of water level is not a condition and the float switch goes OFF. Conditions Supposed 208~230 V power supply is not provided...
Page 184 Troubleshooting by Error Code SiUS341802E The drain pump works when Check the drain piping for the power supply is reset for clogging or upward slope, etc. the indoor unit. voltage of drain pump terminals (∗2) is in accordance to the Replace the indoor unit main criteria (∗3) (within 5 PCB (A1P).
Page 185: Indoor Fan Motor Lock, Overload
SiUS341802E Troubleshooting by Error Code Indoor Fan Motor Lock, Overload Error Code Applicable FXFQ, FXZQ-TA, FXUQ, FXEQ, FXSQ05-48TA, FXMQ07-12PB, FXAQ Models Method of Error Abnormal fan revolutions are detected by a signal output from the fan motor. Detection Error Decision When the fan revolutions do not increase Conditions Supposed...
Page 186 Troubleshooting by Error Code SiUS341802E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply, and then wait for a period of 10 minutes. there any Remove the foreign matter.
Page 187 SiUS341802E Troubleshooting by Error Code ∗1: Check the following connectors. Notes: Model Connector FXFQ-T X20A, Relay connector FXFQ09-30P X20A, Relay connector FXFQ36/48P X20A FXZQ-TA X20A, Relay connector FXUQ-A X20A, Relay connector FXEQ-P X20A FXSQ05-48TA FXMQ07-12PB FXAQ-P X20A ∗2. Resistance measuring points and judgment criteria. 1 —...
Page 188: Indoor Fan Motor Abnormality
Troubleshooting by Error Code SiUS341802E Indoor Fan Motor Abnormality 2.5.1 Indoor Fan Motor Abnormality (FXDQ, FXHQ Models) Error Code Applicable FXDQ, FXHQ Models Method of Error This error is detected if there is no revolutions detection signal output from the fan motor. Detection Error Decision When no revolutions can be detected even at the maximum output voltage to the fan...
Page 189 SiUS341802E Troubleshooting by Error Code 2.5.2 Indoor Fan Motor Abnormality (FXSQ54TA, FXMQ15-54PB Models) Error Code Applicable FXSQ54TA, FXMQ15-54PB Models Method of Error Error from the current flow on the fan PCB Detection Error from the rotation speed of the fan motor in operation Error from the position signal of the fan motor Error from the current flow on the fan PCB when the fan motor starting operation Error Decision...
Page 190 Troubleshooting by Error Code SiUS341802E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power and wait for 10 minutes. There is a Remove the foreign matter. foreign matter around the fan.
Page 191 SiUS341802E Troubleshooting by Error Code resistance among U, V, and W Replace the indoor fan motor (M1F). are unbalanced or short circuited. Remove the signal connector from the fan motor and check the resistance (∗2). Between Vcc and GND terminals, and Replace the indoor fan motor (M1F).
Page 192: Overload/Overcurrent/Lock Of Indoor Fan Motor
Troubleshooting by Error Code SiUS341802E Overload/Overcurrent/Lock of Indoor Fan Motor Error Code Applicable FXMQ-M Models Method of Error This error is detected by detecting that the individual power supply for the fan turns OFF. Detection Error Decision When it is not detected that the individual power supply for the indoor fan turns ON while in Conditions operation.
Page 193: Blower Motor Not Running
SiUS341802E Troubleshooting by Error Code Blower Motor Not Running Error Code Applicable FXTQ-TA Models Outline Error is issued if the indoor unit determines that the indoor fan motor cannot rotate, regardless of the rotation command from indoor unit. Error Decision Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor.
Page 194: Indoor Fan Motor Status Abnormality
Troubleshooting by Error Code SiUS341802E Indoor Fan Motor Status Abnormality A6-20 Error Code Applicable FXTQ-TA Models Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Power Limit or Temp Limit status, it will be deemed a MOTOR LIMIT Conditions abnormal operation.
Page 195: Low Indoor Airflow
SiUS341802E Troubleshooting by Error Code Low Indoor Airflow A6-21 Error Code Applicable FXTQ-TA Models Outline Error is issued if the indoor unit determines that the indoor fan motor rotation is insufficient, regardless of the rotation command from indoor unit. Error Decision Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor.
Page 196: Swing Flap Motor Abnormality
Troubleshooting by Error Code SiUS341802E 2.10 Swing Flap Motor Abnormality Error Code Applicable FXFQ, FXZQ, FXUQ, FXEQ, FXHQ, FXAQ Models Method of Error Utilizes ON/OFF of the limit switch when the motor turns. Detection Error Decision When ON/OFF of the micro-switch for positioning cannot be reversed even though the swing flap Conditions motor is energized for a specified amount of time (about 30 seconds).
Page 197 SiUS341802E Troubleshooting by Error Code The relay cable has no Replace the power supply continuity. relay cable. When the airflow direction flap-cam mechanism is disconnected Replace the defective from the swing motor, swing motor. (∗2) operation is normal when turned ON again.
Page 198: Power Supply Voltage Abnormality
Troubleshooting by Error Code SiUS341802E 2.11 Power Supply Voltage Abnormality Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Error is detected by checking the input voltage of fan motor. Detection Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more. Conditions Supposed Defective power supply voltage...
Page 199: Blower Motor Stops For Over/Under Voltage
SiUS341802E Troubleshooting by Error Code 2.12 Blower Motor Stops for Over/Under Voltage Error Code Applicable FXTQ-TA Models Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Over/Under Voltage status, it will be deemed a MOTOR VOLTS abnormal Conditions operation.
Page 200: Electronic Expansion Valve Coil Abnormality, Dust Clogging
Troubleshooting by Error Code SiUS341802E 2.13 Electronic Expansion Valve Coil Abnormality, Dust Clogging Error Code Applicable All indoor unit models Models Method of Error Check coil condition of electronic expansion valve by using microcomputer. Detection Check dust clogging condition of electronic expansion valve main body by using microcomputer. Error Decision Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
Page 201: Drain Level Above Limit
SiUS341802E Troubleshooting by Error Code 2.14 Drain Level above Limit Error Code Applicable FXFQ, FXZQ, FXUQ, FXEQ, FXDQ, FXSQ-TA, FXMQ-PB Models Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is not in Detection operation.
Page 202: Capacity Determination Device Abnormality
Troubleshooting by Error Code SiUS341802E 2.15 Capacity Determination Device Abnormality Error Code Applicable All indoor unit models Models Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.
Page 203: Transmission Abnormality Between Indoor Unit Pcb And Fan Pcb
SiUS341802E Troubleshooting by Error Code 2.16 Transmission Abnormality between Indoor Unit PCB and Fan PCB Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Transmission conditions between the indoor unit main PCB (A1P) and fan PCB (A2P) are checked via microcomputer. Detection Error Decision When normal transmission is not conducted for certain duration.
Page 204 Troubleshooting by Error Code SiUS341802E ∗1. Pull out and insert the connector once and check it is absolutely connected. Notes: ∗2. Method to check transmission part of indoor unit main PCB. (1) Turn OFF the power and remove the connector X70A of indoor unit PCB (A1P). (2) Short circuit X70A.
Page 205: Blower Motor Communication Error
SiUS341802E Troubleshooting by Error Code 2.17 Blower Motor Communication Error C1-07 Error Code Applicable FXTQ-TA Models Outline Error is issued if transmission abnormalities occur between indoor unit and fan motor. Error Decision If the response message from the fan motor is an abnormal message, and determined as such by Conditions the indoor unit, the indoor unit will execute a retry.
Page 206: Thermistor Abnormality
Troubleshooting by Error Code SiUS341802E 2.18 Thermistor Abnormality C4, C5, C9, CA Error Code Applicable C4, C5: All indoor units C9: except FXTQ-TA models Models CA: FXMQ-PB models only Method of Error The error is detected by temperature detected by thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running.
Page 207: Combination Error Between Indoor Unit Pcb And Fan Pcb
SiUS341802E Troubleshooting by Error Code 2.19 Combination Error between Indoor Unit PCB and Fan PCB Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Check the condition of transmission with fan PCB (A2P) using indoor unit main PCB (A1P). Detection Error Decision When the communication data of fan PCB (A2P) is determined as incorrect.
Page 208: Blower Motor Hp Mismatch
Troubleshooting by Error Code SiUS341802E 2.20 Blower Motor HP Mismatch C6-01 Error Code Applicable FXTQ-TA Models Outline Error is issued if the manufacturer ID and output of the connected fan motor do not match those recognized by the indoor unit. Error Decision Gathers information on the manufacturer ID and output of the fan motor when initializing the fan Conditions...
Page 209: Indoor Blower Does Not Have Required Parameters To Function
SiUS341802E Troubleshooting by Error Code 2.21 Indoor Blower Does Not Have Required Parameters to Function C6-02 Error Code Applicable FXTQ-TA Models Outline Indoor units perform required settings for control on the fan motor, but if the minimum required settings are not made then information indicating as such will be included among the periodic control status information.
Page 210: Remote Sensor Abnormality
Troubleshooting by Error Code SiUS341802E 2.22 Remote Sensor Abnormality Error Code Applicable FXTQ-TA Models Method of Error The error is detected by remote sensor temperature. Detection Error Decision The remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed Defective indoor unit thermistor (R1T) for room temperature...
Page 211: Humidity Sensor System Abnormality
SiUS341802E Troubleshooting by Error Code 2.23 Humidity Sensor System Abnormality Error Code Applicable FXFQ Models Method of Error Even if an error occurs, operation still continues. Detection Error is detected according to the moisture (output voltage) detected by the moisture sensor. Error Decision When the moisture sensor is disconnected or short circuited Conditions...
Page 212: Infrared Presence/Floor Sensor Error
Troubleshooting by Error Code SiUS341802E 2.24 Infrared Presence/Floor Sensor Error Error Code Applicable FXFQ-T, FXUQ-P Models Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart. Error Decision Error is detected based on sensor output signals Conditions Supposed...
Page 213 SiUS341802E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 1 Infrared presence sensor error (Error code CE-01) Is the connection of the connector on infrared presence Connect the connector correctly. sensor PCB (A4P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 214 Troubleshooting by Error Code SiUS341802E Troubleshooting Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the connector on infrared floor sensor PCB Connect the connector correctly. (A3P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 215 SiUS341802E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the connector on infrared floor sensor PCB Connect the connector correctly. (A3P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 216 Troubleshooting by Error Code SiUS341802E Troubleshooting Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the connector on infrared floor sensor PCB Connect the connector correctly. (A3P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 217: Remote Controller Thermistor Abnormality
SiUS341802E Troubleshooting by Error Code 2.25 Remote Controller Thermistor Abnormality Error Code Applicable All indoor unit models Models Method of Error Error detection is carried out by temperature detected by the remote controller thermistor. Detection Error Decision The remote controller thermistor becomes disconnected or shorted while the unit is running. Conditions Supposed Defective remote controller thermistor...
Page 218: Outdoor Unit Pcb Abnormality
Troubleshooting by Error Code SiUS341802E 2.26 Outdoor Unit PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error Abnormality is detected under the communication conditions in the hardware section between the Detection indoor unit and outdoor unit. Error Decision When the communication conditions in the hardware section between the indoor unit and the Conditions...
Page 219: Detection Of Ground Leakage By Leak Detection Circuit
SiUS341802E Troubleshooting by Error Code 2.27 Detection of Ground Leakage by Leak Detection Circuit Error Code Sub code: 01-03 Applicable All outdoor unit models Models Method of Error Detect leakage current in the ground leakage detection circuit and detect error on the outdoor unit Detection main PCB.
Page 220: Missing Of Ground Leakage Detection Core
Troubleshooting by Error Code SiUS341802E 2.28 Missing of Ground Leakage Detection Core Error Code Sub code: 06-08 Applicable All outdoor unit models Models Method of Error Error is detected according to whether or not there is continuity across the connector X101A Detection for leakage detection circuit (Q1LD).
Page 221: Actuation Of High Pressure Switch
SiUS341802E Troubleshooting by Error Code 2.29 Actuation of High Pressure Switch Error Code Applicable All outdoor unit models Models Method of Error Detect continuity across the high pressure switch in the protection device circuit. Detection Error Decision When part of the protection device circuit opens. Conditions (Reference) Operating pressure of the high pressure switch: Operating pressure: 4.0 MPa (580 psi)
Page 222 Troubleshooting by Error Code SiUS341802E Service Checker CHECK 12 Compare the high pressure value checked with the Service Checker and the actual value measured by pressure sensor (∗1). Check if the high pressure value and the actual value Replace the outdoor unit measured by main PCB (A1P).
Page 223: Actuation Of Low Pressure Sensor
SiUS341802E Troubleshooting by Error Code 2.30 Actuation of Low Pressure Sensor Error Code Applicable All outdoor unit models Models Method of Error Make judgement of pressure detected by the low pressure sensor with the outdoor unit main PCB. Detection Error Decision When low pressure caused a drop while the compressor is in operation: Operating pressure: 0.07 MPa (10.2 psi) Conditions...
Page 224: Inverter Compressor Motor Lock
Troubleshooting by Error Code SiUS341802E 2.31 Inverter Compressor Motor Lock Error Code Applicable All outdoor unit models Models Method of Error Outdoor unit PCB takes the position signal from UVW line connected between the inverter and compressor, and the error is detected when any abnormality is observed in the phase-current Detection waveform.
Page 225 SiUS341802E Troubleshooting by Error Code The insulation resistance of the relevant Replace the compressor. compressor is low (< 100 kΩ) Power OFF The relevant compressor has a wiring disconnection in it. Restart the compressor, and then check for the Quit work. operation.
Page 226: Compressor Damage Alarm
Troubleshooting by Error Code SiUS341802E 2.32 Compressor Damage Alarm Error Code Applicable All outdoor unit models Models Method of Error Determine the symptom to be error by detecting the revolutions of the compressor and pressure Detection values detected by the high and low pressure sensors, and further making a comparison between a theoretical current value of the compressor calculated from parameters detected and an actual current value detected by the power transistor.
Page 227 SiUS341802E Troubleshooting by Error Code the high pressure and low pressure checked by the service checker the Replace the outdoor unit main same as the actual measured PCB (A1P). values of the high and low pressure sensors? CHECK 4 Replace the inverter PCB. Is the power transistor normal? RXLQ-TATJU,...
Page 228: Outdoor Fan Motor Abnormality
Troubleshooting by Error Code SiUS341802E 2.33 Outdoor Fan Motor Abnormality 2.33.1 Outdoor Fan Motor Abnormality (208/230 V Models, 460 V Models) Error Code Applicable RXLQ72-120TATJU, RXLQ72-120TAYDU Models Method of Error Detects according to the value of current flowing through the inverter PCB (or fan PCB in case Detection of M2F).
Page 229 SiUS341802E Troubleshooting by Error Code There is no continuity across the fuse Replace the fan PCB (A4P, A5P). (F101U) on the fan PCB. fan cannot be rotated by hand Replace the relevant fan motor. when disconnecting the connector from the fan motor.
Page 230 Troubleshooting by Error Code SiUS341802E 2.33.2 Outdoor Fan Motor Abnormality (575 V Models) Error Code Applicable RXLQ72-120TAYCU, RXYQ72-168TAYCU Models Method of Error Detects according to the value of current flowing through the fan PCB. Detection Error Decision Overcurrent is detected from the fan PCB (Detecting overcurrent 4 times will shut down the Conditions system).
Page 231 SiUS341802E Troubleshooting by Error Code fan cannot be rotated by hand Replace the relevant fan motor. when disconnecting the connector from the fan motor. Resistance between the fan motor power supply cable Replace the relevant fan motor. terminal and the motor frame (metallic part) is not more than 1 MΩ.
Page 232: Electronic Expansion Valve Coil Abnormality
Troubleshooting by Error Code SiUS341802E 2.34 Electronic Expansion Valve Coil Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to whether or not there is continuity across the electronic expansion valve coils (Y1E-Y7E). Detection Error Decision When no current flows through common (COM[+]) at the time of turning ON the power supply.
Page 233: Discharge Pipe Temperature Abnormality
SiUS341802E Troubleshooting by Error Code 2.35 Discharge Pipe Temperature Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with the discharge pipe or compressor body thermistor. Detection Error Decision When discharge pipe temperature becomes abnormally high (i.e., 135°C (275°F) or more) Conditions When discharge pipe temperature sharply rises (remains at 120°C (248°F) or more for a period of consecutive 10 minutes)
Page 234 Troubleshooting by Error Code SiUS341802E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Reset the system operation, and then restart it. CHECK 11 Are the characteristics of the discharge pipe and Replace the relevant thermistor.
Page 235: Wet Alarm
SiUS341802E Troubleshooting by Error Code 2.36 Wet Alarm Error Code Applicable All outdoor unit models Models Method of Error In cooling operation, detect the condition under which liquid refrigerant returns to the compressor, according to the temperature and pressure of each part. Detection Error Decision When the following wet state continues for a period of 90 minutes, an alert is issued.
Page 236: Refrigerant Overcharged
Troubleshooting by Error Code SiUS341802E 2.37 Refrigerant Overcharged Error Code Applicable All outdoor unit models Models Method of Error Detect overcharged refrigerant according to outdoor air temperature, heat exchanger deicer Detection temperature, and liquid pipe temperature during check operation. Error Decision When the amount of refrigerant, which is calculated using outdoor air temperature, heat exchanger Conditions deicer temperature, and liquid pipe temperature during check operation, exceeds the regular...
Page 237: Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb)
SiUS341802E Troubleshooting by Error Code 2.38 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB) Error Code Applicable All outdoor unit models Models Method of Error Check for the transmission conditions of the harnesses between the PCBs using microcomputer. Detection Error Decision Normal transmission between the PCBs is disabled while the compressor stops running.
Page 238: Outdoor Fan Motor Signal Abnormality
Troubleshooting by Error Code SiUS341802E 2.39 Outdoor Fan Motor Signal Abnormality Error Code Applicable RXLQ72-120TATJU, RXLQ72-120TAYDU Models Method of Error Detect of abnormal signal from fan motor. Detection Error Decision An abnormal signal is detected at startup of the fan motor operation. Conditions Supposed Abnormal signal from fan motor (Circuit failure)
Page 239: Outdoor Fan Pcb Abnormality
SiUS341802E Troubleshooting by Error Code 2.40 Outdoor Fan PCB Abnormality Error Code Applicable RXLQ72-120TAYCU, RXYQ72-168TAYCU Models Method of Error Detect with current sensor value. Detection Error Decision When the current sensor shows abnormality. Conditions Supposed Defective fan PCB (A5P, A6P) Causes Troubleshooting Be sure to turn off the power switch before connecting or disconnecting...
Page 240: Thermistor Abnormality
Troubleshooting by Error Code SiUS341802E 2.41 Thermistor Abnormality H9, J3, J5, J6, J7, J8, J9 Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with individual thermistors. Detection Error Decision The system is in operation and the thermistor causes wiring disconnection or short circuit in it. Conditions Supposed Defective connection of thermistor...
Page 241 SiUS341802E Troubleshooting by Error Code ∗1. Error codes and thermistors Note: Error Applicable Thermistor Electric symbol Connector Code Outdoor air thermistor X18A Discharge pipe (M1C) thermistor R21T X19A (Group connector) Compressor body thermistor R14T X15A Compressor suction thermistor R12T (Group connector) X29A Suction pipe thermistor R10T...
Page 242: High Pressure Sensor Abnormality
Troubleshooting by Error Code SiUS341802E 2.42 High Pressure Sensor Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with the high pressure sensor. Detection Error Decision The high pressure sensor is short circuit or open circuit. Conditions (Pressure range: 0-4.3 MPa (0-624 psi)) Supposed...
Page 243: Low Pressure Sensor Abnormality
SiUS341802E Troubleshooting by Error Code 2.43 Low Pressure Sensor Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with the low pressure sensor. Detection Error Decision The low pressure sensor is short circuit or open circuit. Conditions (Pressure range: 0-1.7 MPa (0-247 psi)) Supposed...
Page 244: Inverter Pcb Abnormality
Troubleshooting by Error Code SiUS341802E 2.44 Inverter PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to current value detected during the output of waveform before compressor Detection startup Detect according to current value detected with the current sensor during synchronous operation for startup Error Decision When overcurrent (OCP) flows during the output of waveform...
Page 245 SiUS341802E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply once, and then turn it ON again. Return to normal? The error could have resulted from external factors other than failures (e.g.
Page 246: Momentary Power Failure During Test Operation
Troubleshooting by Error Code SiUS341802E 2.45 Momentary Power Failure during Test Operation Error Code Applicable All outdoor unit models Models Method of Error Momentary power failure is detected by the PCB. Detection Error Decision Judgement is made by AC power frequency detection circuit on the outdoor unit main PCB Conditions Supposed Defective wiring...
Page 247: Reactor Temperature Rise Abnormality
SiUS341802E Troubleshooting by Error Code 2.46 Reactor Temperature Rise Abnormality Error Code Applicable RXLQ72TATJU Models Method of Error Detect according to the value detected with the reactor surface thermistor. Detection Error Decision When the temperature detected with the reactor surface thermistor is more than the specified Conditions temperature.
Page 248: Inverter Radiation Fin Temperature Rise Abnormality
Troubleshooting by Error Code SiUS341802E 2.47 Inverter Radiation Fin Temperature Rise Abnormality 2.47.1 Inverter Radiation Fin Temperature Rise Abnormality (Inverter PCB) Error Code Sub code: 01-03 Applicable All outdoor unit models Models Method of Error Detect temperature of power module of the inverter PCB. Detection Error Decision Thermistor located inside the power module of the inverter PCB for compressor and fan motor.
Page 249 SiUS341802E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for the cooling conditions of cooling tube used to cool the inverter. (1) Is the cooling tube plate fixed with screws? (2) Error code U0 is displayed on the Error History...
Page 250 Troubleshooting by Error Code SiUS341802E 2.47.2 Inverter Radiation Fin Temperature Rise Abnormality (Fan PCB) Error Code Sub code: 06, 07, 18-21 Applicable RXLQ72-120TAYCU, RXYQ72-168TAYCU Models Method of Error Fan PCB radiation fin temperature is detected by the thermistor located inside the fan PCB circuit. Detection Error Decision Detected temperature exceeds a certain level.
Page 251 SiUS341802E Troubleshooting by Error Code 2.47.3 Inverter Radiation Fin Temperature Rise Abnormality (Diode Bridge) Error Code Sub code: 12-14 Applicable RXLQ96/120TATJU, RXLQ96/120TAYDU Models Method of Error Diode bridge radiation fin temperature is detected by the thermistor. Detection Error Decision Detected temperature exceeds a certain level. Conditions Supposed Insulation sheet (blue) improperly fixed on the heat sink...
Page 252: Inverter Compressor Instantaneous Overcurrent
Troubleshooting by Error Code SiUS341802E 2.48 Inverter Compressor Instantaneous Overcurrent Error Code Applicable All outdoor unit models Models Method of Error Detect current flowing through the power transistor. Detection Error Decision When instantaneously overcurrent flows through the power transistor. Conditions Supposed Defective compressor coil (such as wiring disconnection or insulation failure) Causes...
Page 253 SiUS341802E Troubleshooting by Error Code Power OFF CHECK 4 Is the power Replace the inverter transistor normal? PCB. RXLQ-TATJU, RXLQ-TAYDU: A3P RXLQ-TAYCU, RXYQ-TAYCU: A4P Restarting the system results in the Continue operation. recurrence of the The error could have error. resulted from causes such as instantaneous power failure.
Page 254: Inverter Compressor Overcurrent
Troubleshooting by Error Code SiUS341802E 2.49 Inverter Compressor Overcurrent Error Code Applicable All outdoor unit models Models Method of Error Detect current flowing through the power transistor. Detection Error Decision When the secondary-side inverter current exceeds. Conditions Supposed Compressor overloaded Causes Wiring disconnection in compressor coil Disconnection of compressor wiring...
Page 255 SiUS341802E Troubleshooting by Error Code Power OFF CHECK 4 Is the power Replace the inverter transistor normal? PCB. RXLQ-TATJU, RXLQ-TAYDU: A3P RXLQ-TAYCU, RXYQ-TAYCU: A4P Restarting the system results in the Continue operation. recurrence of the The error could have error. resulted from causes such as instantaneous power failure.
Page 256: Inverter Compressor Startup Abnormality
Troubleshooting by Error Code SiUS341802E 2.50 Inverter Compressor Startup Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect error according to the signal waveform of compressor. Detection Error Decision When compressor startup operation has not been completed. Conditions Supposed The stop valve is not opened...
Page 257 SiUS341802E Troubleshooting by Error Code Refrigerant is melting (No power Eliminate the melting state of applied for a period of 6 refrigerant. hours or more) Is the insulation resistance of the Replace the compressor. relevant compressor 100 kΩ or more? There is wiring disconnection in Replace the compressor.
Page 258: Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb
Troubleshooting by Error Code SiUS341802E 2.51 Transmission Error between Inverter PCB and Outdoor Unit Main PCB Error Code Applicable All outdoor unit models Models Method of Error Check for the transmission conditions between the inverter PCB and the outdoor unit main PCB Detection using a microcomputer.
Page 259 SiUS341802E Troubleshooting by Error Code microcomputer normal monitor indication This is not the LC error. lamp (green) on the outdoor unit main PCB (A1P) Recheck the error code. is blinking. microcomputer The fuse of normal monitor indication Replace the inverter PCB (∗2). the noise filter PCB has lamp (green) on the outdoor blown out.
Page 260: Power Supply Voltage Imbalance
Troubleshooting by Error Code SiUS341802E 2.52 Power Supply Voltage Imbalance Error Code Applicable All outdoor unit models Models Method of Error Detect voltage imbalance through PCB. Detection Error Decision When power supply voltage imbalance exceeds approximately 12 V. Conditions Error is not decided while the unit operation is continued. P1 will be displayed by pressing the inspection button.
Page 261 Explanation to users Be sure to explain user that “power supply Hand the “Notice of Inspection Results” to user to ask voltage imbalance” will occur and Daikin him/her to rectify the imbalance. accepts no responsibility for the imbalance. ∗1. Make measurement of voltage at the power supply terminal block (X1M).
Page 262: Reactor Surface Thermistor Abnormality
Troubleshooting by Error Code SiUS341802E 2.53 Reactor Surface Thermistor Abnormality Error Code Applicable RXLQ72TATJU Models Method of Error Detect according to the value detected with the reactor surface thermistors. Detection Error Decision When the system is in operation and the thermistor disconnection or short circuit is detected. Conditions Supposed Defective connection of thermistor...
Page 263: Inverter Radiation Fin Temperature Abnormality
SiUS341802E Troubleshooting by Error Code 2.54 Inverter Radiation Fin Temperature Abnormality 2.54.1 Inverter Radiation Fin Temperature Abnormality (Inverter PCB) Error Code Sub code: 09-11 Applicable All outdoor unit models Models Method of Error Detect the resistance of the following thermistors while the compressor stops running: Radiation fin thermistor.
Page 264 Troubleshooting by Error Code SiUS341802E 2.54.2 Inverter Radiation Fin Temperature Abnormality (Fan PCB) Error Code Sub code: 02, 03, 15-18 Applicable All outdoor unit models Models Method of Error Detects the resistance of the thermistor located inside the fan PCB circuit while the fan motor is not Detection in operation: Error Decision...
Page 265: Field Setting After Replacing Outdoor Unit Main Pcb Abnormality Or Combination Of Pcb Abnormality
SiUS341802E Troubleshooting by Error Code 2.55 Field Setting after Replacing Outdoor Unit Main PCB Abnormality or Combination of PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error This error is detected according to communications with the inverter PCB. Detection Error Decision Make judgement according to communication data on whether or not the type of the inverter PCB is...
Page 266: Refrigerant Shortage
Troubleshooting by Error Code SiUS341802E 2.56 Refrigerant Shortage Error Code Applicable All outdoor unit models Models Method of Error Detect refrigerant shortage according to a low pressure level or a difference in heat exchanging Detection temperature from the suction pipe. Error Decision Low pressure becomes 0.1 MPa (14.5 psi) or less.
Page 267: Reverse Phase, Open Phase
SiUS341802E Troubleshooting by Error Code 2.57 Reverse Phase, Open Phase 2.57.1 Reverse Phase, Open Phase (Except RXLQ72TAYDU) Error Code Applicable RXLQ72-120TATJU, RXLQ96/120TAYDU, RXLQ72-120TAYCU, RXYQ72-168TAYCU Models Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or Detection reverse phase are judged.
Page 268 Troubleshooting by Error Code SiUS341802E 2.57.2 Reverse Phase, Open Phase (RXLQ72TAYDU) Error Code Applicable RXLQ72TAYDU Models Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or Detection reverse phase are judged. Error Decision When a power supply is reverse phase, or T phase is open phase.
Page 269: Power Supply Insufficient Or Instantaneous Abnormality
SiUS341802E Troubleshooting by Error Code 2.58 Power Supply Insufficient or Instantaneous Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect the voltage of capacitor of the main circuit in the inverter PCB. Detection Error Decision When the voltage in the DC circuit (between diode module and power module) falls below 190 VDC Conditions (for 208/230 V models), 380 VDC (for 460 V models) or 560 VDC (for 575 V models).
Page 270 Troubleshooting by Error Code SiUS341802E The insulation resistance of the fan Replace the fan motor. motor is not more than If the motor gets severely 1 MΩ. damaged, the inverter PCB should also be replaced. CHECK 4 Is the power Replace the inverter PCB.
Page 271: Check Operation Not Executed
SiUS341802E Troubleshooting by Error Code 2.59 Check Operation not Executed Error Code Applicable All outdoor unit models Models Method of Error Check operation is executed or not executed Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed Check operation is not executed.
Page 272: Transmission Error Between Indoor Units And Outdoor Units
Troubleshooting by Error Code SiUS341802E 2.60 Transmission Error between Indoor Units and Outdoor Units Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
Page 273 SiUS341802E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for details of error in monitor mode. U4-01 Refer to troubleshooting U4-03 (Indoor unit system transmission error) Has the indoor or...
Page 274 Troubleshooting by Error Code SiUS341802E U4-03 Indication after launch test Check controller indoor units : operation? (1) Some error about thermistor, or fan motor, electronic expansion valve, or defective PCB. (2) Test operation was interrupted by button BS1 Operate all indoor units. "Mode".
Page 275: Transmission Error Between Remote Controller And Indoor Unit
SiUS341802E Troubleshooting by Error Code 2.61 Transmission Error between Remote Controller and Indoor Unit Error Code Applicable All indoor unit models Models Method of Error Microcomputer checks if transmission between indoor unit and remote controller is normal. Detection Error Decision Transmission is not carried out normally for a certain amount of time Conditions Supposed...
Page 276: Transmission Error Between Outdoor Units
Troubleshooting by Error Code SiUS341802E 2.62 Transmission Error between Outdoor Units Error Code Applicable All outdoor unit models Models Method of Error Microcomputer checks if transmission between outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions Supposed Connection error of transmission wirings between outdoor unit and external control adaptor for...
Page 277 SiUS341802E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Ensure the sub code or the lamp display of monitor mode, and then go to the following: U7-01 Error code Sub code...
Page 278 Troubleshooting by Error Code SiUS341802E Diagnosis Flowchart-1 U7-01 Error code Sub code (Transmission error when the external control adaptor is mounted) there any wiring disconnection or wiring error in the transmission Modify the transmission wirings wirings to the external to the external control adaptor for control adaptor for outdoor unit.
Page 279 SiUS341802E Troubleshooting by Error Code Diagnosis Flowchart-2 U7-02 Error code Sub code (Transmission error when the external control adaptor for outdoor unit is mounted) Unified Cool/ Heat Set Cool/Heat selection selection for the external control adaptor for outdoor unit to “IND.” Cool/Heat selection for the external control adaptor...
Page 280 Troubleshooting by Error Code SiUS341802E Diagnosis Flowchart-3 U7-03 Error code Sub code (Transmission error between master and slave 1) multi transmission wirings to multi slave 1 have Replace the outdoor unit main caused wiring disconnection in them or are being PCB (A1P) for multi slave 1.
Page 281 SiUS341802E Troubleshooting by Error Code Diagnosis Flowchart-6 U7-06 Error code Sub code (Manual address setting error for slave 1, 2) One of outdoor unit multi transmission wirings has Replace the outdoor unit main caused wiring disconnection in it PCB (A1P). or been disconnected.
Page 282: Transmission Error Between Main And Sub Remote Controllers
Troubleshooting by Error Code SiUS341802E 2.63 Transmission Error between Main and Sub Remote Controllers Error Code Applicable All indoor unit models Models Method of Error In case of controlling with 2 remote controller, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub remote controller) is normal.
Page 283: Transmission Error Between Indoor And Outdoor Units In The Same System
SiUS341802E Troubleshooting by Error Code 2.64 Transmission Error between Indoor and Outdoor Units in the Same System Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Detect the error signal for the other indoor unit within the circuit by outdoor unit PCB. Detection Error Decision When the error decision is made on any other indoor unit within the system concerned...
Page 284: Improper Combination Of Indoor And Outdoor Units, Indoor Units And Remote Controller
Troubleshooting by Error Code SiUS341802E 2.65 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error A difference occurs in data by the type of refrigerant between indoor and outdoor units. Detection The number of indoor units connected is out of the allowable range.
Page 285 SiUS341802E Troubleshooting by Error Code Diagnosis Flowchart-1 UA-17 Error code Sub code number of indoor Is the units connected to the model of indoor Replace the outdoor unit main same system is not unit FXTQ? PCB (A1P). more than 64. Incorrect electric heater capacity setting...
Page 286 Troubleshooting by Error Code SiUS341802E Diagnosis Flowchart-3 UA-20 Error code Sub code Multi connection? Replace the outdoor unit main PCB (A1P). Was the different model outdoor unit PCB Replace the outdoor unit main PCB of outdoor unit is replaced with a spare (A1P).
Page 287 SiUS341802E Troubleshooting by Error Code Diagnosis Flowchart-5 UA-29 Error code Sub code Is there any branch selector Incorrect system setup. unit connected? Check if system is heat pump or heat recovery. Was the outdoor unit PCB Replace the outdoor unit main PCB replaced with a spare (A1P).
Page 288 Troubleshooting by Error Code SiUS341802E Diagnosis Flowchart-6 UA-35 Error code Sub code Is the multi combination of Correct the multi combination of outdoor units outdoor units. proper? Was the outdoor unit PCB Replace the outdoor unit main PCB replaced with a spare (A1P).
Page 289: Incorrect Electric Heater Capacity Setting
SiUS341802E Troubleshooting by Error Code 2.66 Incorrect Electric Heater Capacity Setting UA-17 Error Code Applicable FXTQ-TA Models Outline After attaching optional electric heater, if the electric heater capacity setting (11(21)-5) is made mistakenly for heaters not featured in the lineup, heating via unintended levels of airflow will be prevented.
Page 290: Address Duplication Of Centralized Control Equipment
Troubleshooting by Error Code SiUS341802E 2.67 Address Duplication of Centralized Control Equipment Error Code Applicable All indoor unit models Models Centralized control equipment Method of Error The principal indoor unit detects the same address as that of its own on any other indoor unit. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected.
Page 291: Transmission Error Between Centralized Control Equipment And Indoor Unit
SiUS341802E Troubleshooting by Error Code 2.68 Transmission Error between Centralized Control Equipment and Indoor Unit Error Code Applicable All indoor unit models Schedule timer Central remote controller Models Method of Error Microcomputer checks if transmission between indoor unit and centralized control equipment is normal.
Page 292 Troubleshooting by Error Code SiUS341802E Check transmission wiring between centralized control Correct the wiring. equipment for any broken wire. CHECK 15 Check the transmission wiring between main centralized control Correct the wiring. equipment for any broken wire. CHECK 15 the main centralized control Correct the connection of the equipment setting connector...
Page 293: System Not Set Yet
SiUS341802E Troubleshooting by Error Code 2.69 System Not Set Yet Error Code Applicable All indoor unit models Models All outdoor unit models Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that Detection of indoor units that have made changes in temperature.
Page 294: System Abnormality, Refrigerant System Address Undefined
Troubleshooting by Error Code SiUS341802E 2.70 System Abnormality, Refrigerant System Address Undefined Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Detect an indoor unit with no auto address setting. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected. Conditions Supposed Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor...
Page 295 SiUS341802E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Does an error electricity occur even after being introduced 12 minutes elapses for the first time after from the time when Normal installation or after an...
Page 296: Check
Check SiUS341802E 3. Check High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. ←Check to be sure the stop valve is open. Stop valve closed Local High pipe ←Conduct visual checks for pipe conditions. pressure Bent or crashed pipe resistance...
Page 297: Low Pressure Check
SiUS341802E Check Low Pressure Check CHECK 2 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. [In cooling] Defective low pressure ←Is the pressure value checked with the Service Checker sensor Defective (∗1.) corresponding to the measurement value of the pressure sensor? compressor Defective ←Are the voltage characteristics normal?
Page 298: Superheat Operation Check
Check SiUS341802E Superheat Operation Check CHECK 3 Identify the defective points referring to the failure factor analysis (FTA) as follows. Hot gas circuit clogging Defective hot Defective solenoid ← Are the coil resistance and insulation normal? gas bypass valve coil control Defective solenoid valve body...
Page 299: Power Transistor Check
SiUS341802E Check Power Transistor Check CHECK 4 Perform the following procedures prior to check. (1) Power OFF. (2) Remove all the wiring connected to the PCB where power transistors are mounted on. Preparation ∗ Prepare the analog type of multimeter. Multimeter For the digital type of multimeter, those with diode check function are available for the...
Page 300 Check SiUS341802E RXLQ96/120TATJU Point of Measurement and Judgement Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...
Page 301 SiUS341802E Check RXLQ72TAYDU Point of Measurement and Judgement Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...
Page 302 Check SiUS341802E RXLQ96/120TAYDU Point of Measurement and Judgement Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...
Page 303 SiUS341802E Check RXLQ72-120TAYCU, RXYQ72-168TAYCU Point of Measurement and Judgement Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...
Page 304: Refrigerant Overcharge Check
Check SiUS341802E Refrigerant Overcharge Check CHECK 6 In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgement, refer to the information below. Diagnosis of overcharge of refrigerant 1.
Page 305: Refrigerant Shortage Check
SiUS341802E Check Refrigerant Shortage Check CHECK 7 In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgement, refer to the information below. Diagnosis of shortage of refrigerant 1.
Page 306: Vacuuming And Dehydration Procedure
Check SiUS341802E Vacuuming and Dehydration Procedure CHECK 8 Conduct vacuuming and dehydration in the piping system following the procedure for described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for ...
Page 307: Thermistor Check
SiUS341802E Check Thermistor Check CHECK 11 Thermistor type of indoor units Indoor heat exchanger Indoor heat exchanger Suction air thermistor Discharge air thermistor (liquid) thermistor (gas) thermistor Model FXFQ-T Type C – Type J FXFQ-P Type D – FXZQ-TA Type A –...
Page 308 Check SiUS341802E Thermistor temperature Resistance (kΩ) (°C) (°F) Type A Type B Type C Type D –30 –22 363.8 361.7719 – 336.7 –25 –13 266.8 265.4704 – 253.1 –20 –4 197.8 196.9198 – 191.2 –15 148.2 147.5687 – 144.1 –10 112.0 111.6578 111.8...
Page 309 SiUS341802E Check Thermistor temperature Resistance (kΩ) (°C) (°F) Type E Type H Type J Type L Type M –30 –22 362.4862 3257.371 359.8518 363.8 350.6 –25 –13 265.9943 2429.222 265.0699 266.8 257.4 –20 –4 197.3083 1827.883 197.1476 197.8 191.0 –15 147.8597 1387.099 147.7348...
Page 310: Pressure Sensor Check
Check SiUS341802E Pressure Sensor Check CHECK 12 4.15 4.15 Detected Pressure (MPa) = × V – × 0.5 (psi) (kg/cm (MPa) (MPa) = × V – × 0.5 51.0 5.0 1 MPa = 145 psi : High pressure (MPa) 45.9 : Low pressure (MPa) High Pressure (P : Output Voltage (High Side) (VDC)
Page 311: Broken Wire Check Of The Relay Wires
SiUS341802E Check 3.10 Broken Wire Check of the Relay Wires CHECK 15 1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires On the system shown below, turn OFF the power supply to all equipment, short circuit between the outdoor-outdoor unit terminal F1 and F2 in the "Outdoor Unit A" that is farthest from the central remote controller, and then conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the central remote controller using a multimeter.
Page 312: Fan Motor Connector Check (Power Supply Cable)
Check SiUS341802E 3.11 Fan Motor Connector Check (Power Supply Cable) CHECK 16 (1) Turn OFF the power supply. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.
Page 313: Electronic Expansion Valve Coil Check
SiUS341802E Check 3.13 Electronic Expansion Valve Coil Check Measure the connector pin-to-pin resistance and make sure that the resistance value is within the CHECK 18 range listed in the table below. Determine the type according to the connector wire color and measure the resistance. Outdoor unit (Y1E, Y3E, Y4E) White 1 Yellow 2...
Page 314 Check SiUS341802E FXZQ-M, FXMQ-PB, FXAQ-P Judgement criteria Measuring points White 1 300 Ω White-Orange 150 Ω White-Red Yellow 2 300 Ω Yellow-Blue 150 Ω Yellow-Brown Orange 3 Blue 4 Red 5 Brown 6 FXDQ-M, FXMQ-M, FXHQ-M, FXLQ-M, FXNQ-M, FXMQ-MF Blue Brown Orange Measuring points...
Page 315: Part 7 Appendix
SiUS341802E Part 7 Appendix 1. Wiring Diagrams..................303 1.1 Outdoor Unit ..................... 303 1.2 Indoor Unit....................308 1.3 Air Treatment Equipment ................. 316 Appendix...
Page 316: Wiring Diagrams
Wiring Diagrams SiUS341802E 1. Wiring Diagrams Outdoor Unit RXLQ72TATJU Appendix...
Page 317 SiUS341802E Wiring Diagrams RXLQ96/120TATJU Appendix...
Page 318 Wiring Diagrams SiUS341802E RXLQ72TAYDU Appendix...
Page 319 SiUS341802E Wiring Diagrams RXLQ96/120TAYDU Appendix...
Page 320 Wiring Diagrams SiUS341802E RXLQ72/96/120TAYCU, RXYQ72/96/120/144/168TAYCU Appendix...
Page 321: Indoor Unit
SiUS341802E Wiring Diagrams Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU INDOOR UNIT PRINTED CIRCUIT BOARD PRINTED CIRCUIT BOARD POWER SUPPLY R2T R3T (NOTE 8) PRINTED CIRCUIT BOARD (INFRARED FLOOR SENSOR) t˚ t˚ INPUT FROM OUTSIDE(NOTE 3) 208/230V PRINTED CIRCUIT BOARD NE V1R TRANSMISSION WIRING(NOTE 2) 60Hz C105 (INFRARED PRESENCE SENSOR)
Page 322 Wiring Diagrams SiUS341802E FXFQ09/12/18/24/30/36/48PVJU INDOOR UNIT PRINTED CIRCUIT BOARD PRINTED CIRCUIT BOARD C105 CAPACITOR FUSE ( B , 5A, 250V) t˚ t˚ POWER SUPPLY LIGHT EMITTING DIODE X18A X17A X15A (SERVICE MONITOR GREEN) C105 208/230V MAGNETIC RELAY (M1P) 60Hz MOTOR (INDOOR FAN) NOTE)6 MOTOR (DRAIN PUMP) X27A...
Page 323 SiUS341802E Wiring Diagrams FXZQ07/09/12/15/18MVJU9 PRINTED CIRCUIT BOARD BS BUTTON (ON/OFF) CAPACITOR (M1F) PILOT LAMP FUSE ( B , 5A, 250V) (ON-RED) POWER SUPPLY t˚ t˚ t˚ PILOT LAMP PILOT LAMP NOTE)6 (SERVICE MONITOR GREEN) (TIMER-GREEN) MAGNETIC RELAY (M1P) PILOT LAMP 208/230V INPUT FROM OUTSIDE X23A...
Page 324 Wiring Diagrams SiUS341802E FXEQ07/09/12/15/18/24PVJU 3D098557A FXDQ07/09/12/18/24MVJU PRINTED CIRCUIT BOARD CAPACITOR (M1F) FUSE (F5A/250V) LIGHT EMITTING DIODE (SERVICE MONITOR GREEN) MAGNETIC RELAY (M1P) MOTOR (INDOOR FAN) MOTOR (DRAIN PUMP) t˚ t˚ t˚ NOTE)7 THERMAL PROTECTOR (M1F EMBEDDED) POWER SUPPLY THERMISTOR (AIR) NOTE)5 INPUT FROM X13A...
Page 325 SiUS341802E Wiring Diagrams FXSQ05/07/09/12/15/18/24/30/36/48/54TAVJU 3D110467A FXMQ07/09/12/15/18/24/30/36/48/54PBVJU INDOOR UNIT THERMISTOR (GAS) PRINTED CIRCUIT THERMISTOR R3T R4T (DISCHARGE AIR) BOARD THERMISTOR NTC PRINTED CIRCUIT t˚ t˚ t˚ t˚ BOARD (FAN) (CURRENT LIMITING) NOTE)5 POWER /YLW X25A PRINTED CIRCUIT FLOAT SWITCH SUPPLY X16A X18A X17A X13A...
Page 326 Wiring Diagrams SiUS341802E FXMQ72/96MVJU INDOOR UNIT THERMISTOR (AIR) PRINTED CIRCUIT BOARD R2T•R3T THERMISTOR (COIL) EL. COMPO. BOX C1•C2 CAPACITOR (M1F•2F) SELECTOR SWITCH POWER SUPPLY SS C1 C2 (STATIC PRESSURE) FUSE ( B , 5A, 250V) X18A LIGHT EMITTING DIODE TRANSFORMER (208V/230V 25VA) 208/230V (SERVICE MONITOR-GREEN) TERMINAL BLOCK (POWER)
Page 327 SiUS341802E Wiring Diagrams FXAQ07/09/12/18/24PVJU RECEIVER/DISPLAY UNIT (WIRELESS REMOTE CONTROLLER) GRN/YLW t˚ t˚ t˚ POWER SUPPLY 1~ 208/230V X14A X18A X19A 60Hz X27A NE V1R X24A (NOTE)7 (NOTES) : TERMINAL INPUT FROM OUTSIDE (NOTE)4 : FIELD WIRING X35A X38A X15A TRANSMISSION WIRING : CONNECTOR X30A (NOTE)7...
Page 328 Wiring Diagrams SiUS341802E FXTQ09/12/18/24/30/36/42/48/54/60TAVJUA(D) (SEE NOTE 4) 208/230 GROUND LUG HEATER KIT (SEE NOTE 5) DISCONNECT SWITCH WIRING INSTALLING AUX ALARM (ALARM) (SEE NOTE 6) (SEE NOTE 1) (SEE NOTE 1) 24VAC 24VAC RELAY IN (ACC-IN) HEATER KIT RELAY OUT OUTPUT (ACC-OUT) TB10...
Page 329: Air Treatment Equipment
SiUS341802E Wiring Diagrams Air Treatment Equipment 1.3.1 Outdoor-Air Processing Unit FXMQ48/72/96MFVJU Appendix...
Page 330 Wiring Diagrams SiUS341802E 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Appendix...
Page 331 SiUS341802E Wiring Diagrams VAM1200GVJU Appendix...
Page 332 Revision History Month / Year Version Revised contents 04 / 2018 SiUS341802E First edition...
Page 333 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

Daikin Aurora Series Service Manual

Part 1 General Information

Part 2 Refrigerant Circuit

Part 3 Remote Controller

Part 4 Functions and Control

Part 5 Field Settings and Test Operation

Part 6 Service Diagnosis

Part 7 Appendix

Quick Links

Troubleshooting

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Summary of Contents for Daikin Aurora Series