Fujitsu AO G36KBTB Series Service Instruction
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Fujitsu AO G36KBTB Series Service Instruction

1 phase type room air conditioner
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SERVICE
INSTRUCTION
1 PHASE TYPE
ROOM AIR CONDITIONER
Simultaneous
operation multi type
Models Indoor unit
AUXG18KVLA
AUXG22KVLA
AUXG24KVLA
ARXG18KLLAP
ARXG22KMLA
ARXG24KMLA
RCG18KVLA
RCG22KVLA
RCG24KVLA
RCG18KVLA
RDG18KLLAP
RDG18KLLAP
RDG22KMLA
RDG24KMLA
Outdoor unit
AO*G36KBTB
AO*G45KBTB
AO*G54KBTB
ROG36KBTB
ROG45KBTB
ROG54KBTB
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Summary of Contents for Fujitsu AO G36KBTB Series

  • Page 1 1 PHASE TYPE ROOM AIR CONDITIONER Simultaneous operation multi type SERVICE INSTRUCTION Models Indoor unit Outdoor unit AO*G36KBTB AUXG18KVLA AO*G45KBTB AUXG22KVLA AUXG24KVLA AO*G54KBTB ARXG18KLLAP ARXG22KMLA ARXG24KMLA RCG18KVLA ROG36KBTB RCG22KVLA ROG45KBTB ROG54KBTB RCG24KVLA RCG18KVLA RDG18KLLAP RDG18KLLAP RDG22KMLA RDG24KMLA...

  • Page 2: Control And Functions

    1. CONTROL AND FUNCTIONS 2021.03.12 SR_CH04_SM002EG_02...

  • Page 3: Table Of Contents

    CONTENTS 1. CONTROL AND FUNCTIONS 1. Compressor frequency control..............01-1 1-1. Cooling operation ......................01-1 1-2. Heating operation ......................01-5 1-3. Dry operation ........................01-6 1-4. Compressor frequency at normal start-up ..............01-7 1-5. Compressor frequency limitation by outdoor temperature ..........01-9 2. Auto changeover operation..............01-11 3.
  • Page 4 CONTENTS (continued) 8-8. Low outdoor temperature protection................01-38 8-9. High temperature and high pressure release control ............01-38...

  • Page 6: Compressor Frequency Control

    1. Compressor frequency control 1-1. Cooling operation A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. •...
  • Page 7 • Limit of maximum speed based on outdoor temperature Outdoor temperature rises Outdoor temperature drops 36°C A zone 34°C 32°C B zone 30°C 21°C C zone 19°C 12°C D zone 10°C 2°C E zone 0°C F zone Unit: rps – Model: AOHG36KBTB Outdoor Indoor unit fan mode Model name...
  • Page 8 ¢ Slim duct type • Compressor frequency range Connected model name Minimum frequency Maximum frequency AOHG36KBTB 15 rps 98 rps AOHG45KBTB 17 rps 95 rps AOHG54KBTB 17 rps 95 rps • Limit of maximum speed based on outdoor temperature Outdoor temperature rises Outdoor temperature drops...
  • Page 9 ¢ Medium static pressure duct type • Compressor frequency range Connected model name Minimum frequency Maximum frequency AOHG36KBTB 15 rps 98 rps AOHG45KBTB 17 rps 95 rps AOHG54KBTB 17 rps 95 rps • Limit of maximum speed based on outdoor temperature Outdoor temperature rises Outdoor...

  • Page 10: Heating Operation

    1-2. Heating operation A sensor (room temperature thermistor) built in indoor unit body will usually perceive difference or variation between setting temperature and present room temperature, and controls operation fre- quency of compressor. • If the room temperature is 6.0 °C lower than a set temperature, the compressor operation frequen- cy will attain to maximum performance.

  • Page 11: Dry Operation

    1-3. Dry operation The compressor rotation frequency shall change according to the temperature, set temperature, and room temperature variation which the room temperature sensor of the indoor unit has detected as shown in the table below. Zone is defined by set temperature and room temperature. •...

  • Page 12: Compressor Frequency At Normal Start-Up

    1-4. Compressor frequency at normal start-up ¢ Model: AOHG36KBTB Compressor frequency soon after starting is controlled as below. Frequency VIII Frequency VII Frequency VI Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4 Time 5 Time 6...
  • Page 13 ¢ Models: AOHG45KBTB and AOHG54KBTB Compressor frequency soon after starting is controlled as below. Frequency X Frequency IX Frequency VIII Frequency VII Frequency VI Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4 Time 5 Time 6...

  • Page 14: Compressor Frequency Limitation By Outdoor Temperature

    1-5. Compressor frequency limitation by outdoor temperature The minimum compressor frequency is limited by outdoor temperature as below. • Cooling/Dry mode K zone 52°C J zone 50°C I zone 46°C H zone 31°C G zone 21°C F zone 13°C E zone 7°C D zone °C...
  • Page 15 • Heating mode I zone 20°C H zone 16°C G zone 12°C F zone 7°C E zone 2°C D zone -7°C C zone -10°C B zone -15°C A zone Limitation of compressor Model name Outdoor temperature zone frequency A zone 58 rps B zone 52 rps...

  • Page 16: Auto Changeover Operation

    2. Auto changeover operation When the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set be- tween 18°C and 30°C in 1.0°C steps.
  • Page 17 Operation flow chart Start Ts: Setting temperarure Monitor mode Room temp. > Ts+2°C? Room temp. < Ts-2°C? Middle zone Auto change over is second or more? Operation mode before the monitor mode is cooling mode? Operation mode of Heating operation Cooling operation outdoor unit: Cooling? Thermostat remains...

  • Page 18: Fan Control

    3. Fan control Tr: Room temperature Ts: Setting temperature 3-1. Indoor fan control ¢ Compact cassette type  Fan speed Indoor fan speed is defined as below. Speed (rpm) Operation mode Fan mode AUXG18KVLA AUXG22KVLA AUXG24KVLA HIGH MED+ Heating QUIET Cool air prevention S-LOW HIGH...
  • Page 19  Dry operation During dry operation, fan speed setting can not be changed as shown in “Fan speed” above.  Heating operation Switch the airflow AUTO, and the indoor fan motor will run according to a room temperature, as be- low.
  • Page 20 • Powerful operation Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C 37°C HIGH 39°C 34°C or setting fan mode* 37°C 32°C Cool air prevention 30°C 24°C S-LOW 13 minutes later: Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C...
  • Page 21 ¢ Slim duct and Medium static pressure duct types  Fan speed Indoor fan speed is defined as below. Speed (rpm) Operation mode Fan mode ARXG22KMLA ARXG18KLLAP ARXG24KMLA HIGH 1,380 1,300 Heating 1,220 QUIET 1,140 S-LOW HIGH 1,380 1,300 1,220 Cooling/Fan QUIET 1,140...
  • Page 22  Heating operation Switch the airflow AUTO, and the indoor fan motor will run according to a room temperature, as be- low. On the other hand, if switched in HIGH—QUIET, the indoor motor will run at a constant airflow of HEAT operation modes QUIET, LOW, MED, HIGH as shown in “Fan speed”...
  • Page 23  Moisture return prevention control (cooling and dry mode) Switch the airflow AUTO at cooling mode, and the indoor fan motor will run as shown below. Compressor Indoor fan setting airflow Indoor fan speed S-LOW 30 (sec) - (01-18) - 3-1.

  • Page 24: Outdoor Fan Control

    3-2. Outdoor fan control ¢ Outdoor fan motor This outdoor unit has a DC fan motor. (Control method is different between AC and DC motors.) ¢ Fan speed  Model: AOHG36KBTB Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry...
  • Page 25  Models: AOHG45KBTB and AOHG54KBTB Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry Heating — — — S-HIGH — • When the compressor frequency increases, the outdoor fan speed also changes to the higher speed.

  • Page 26: Louver Control

    4. Louver control 4-1. Individual louver control (For Compact cassette type) To independently can be set the airflow pattern of each louver as follows: This function is given priority to overall louver control. But this function is release during the following operation.

  • Page 27: Swing Operation (For Compact Cassette Type)

    4-3. Swing operation (For Compact cassette type) • To select vertical airflow swing operation When the swing signal is received, the vertical airflow direction louver starts to swing. – Swinging range • Cooling mode/dry mode/fan mode: 1 ↔ 4 • Heating mode: 1 ↔ 4 –...

  • Page 28: Timer Operation Control

    5. Timer operation control 5-1. Wireless remote control On/Off timer Program timer Sleep timer Weekly timer ○ ○ ○ — ¢ On/Off timer • Off timer: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 29 ¢ Sleep timer If the sleep timer is set, the room temperature is monitored and the operation is stopped auto- matically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time on. •...

  • Page 30: Wired Remote Control

    5-2. Wired remote control Temperature set On/Off timer Program timer Sleep timer Weekly timer back timer ○ ○ ○ ○ ○ ¢ On/Off timer • Off timer: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 31 ¢ Sleep timer If the sleep timer is set, the room temperature is monitored and the operation is stopped auto- matically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time on. •...
  • Page 32 ¢ Temperature set back timer • The SET BACK timer only changes the set temperature for 7 days, it cannot be used to start or stop air conditioner operation. • The SET BACK timer can be set to operate up to two times per day but only one temperature setting can be used.

  • Page 33: Defrost Operation Control

    6. Defrost operation control Tn: Outdoor unit heat exchanger temperature Ta: Outdoor temperature Tn10: Temperature at 10 minutes after compressor start Tnb: Temperature before 5 minutes Triggering condition • The defrost operation starts when outdoor unit heat exchanger temperature sensor detects the temperature lower than the values shown below.

  • Page 34: Defrost Operation In Heating Operation Stopped

    6-1. Defrost operation in heating operation stopped If the outdoor unit is frosted when stopping the heating operation, it stops after performing the auto- matic defrosting operation. In this time, if the indoor unit operation lamp flashes slowly (6 sec on/2 sec off), the outdoor unit al- low the heat exchanger to defrost, and then stop.

  • Page 35: Various Control

    7. Various control 7-1. Auto restart When the power was interrupted by a power failure etc. during operation, the operation contents at that time are memorized and when the power is recovered, operation is automatically started with the memorized operation contents. Operation contents memorized when the power is interrupted Operation mode Setting temperature...

  • Page 36: Compressor Preheating

    7-5. Compressor preheating By preheating the compressor, warm airflow is quickly discharged when the operation is started. • Triggering condition 1 – Outdoor temperature ≤ 20°C When outdoor temperature reaches 26°C, compressor preheating stops. – 30 minutes after compressor stopped •...

  • Page 37: Drain Pump Control

    7-8. Drain pump control ¢ Drain control for dehumidification operation  During cooling or dry mode • On the main unit, when the compressor starts, the drain pump unit starts simultaneously. When the sub unit receives the signal from the main unit, the drain pump of the sub unit starts simultaneously.

  • Page 38: Prevention To Restart For 3 Minutes (3 Minutes St)

     During heating mode or fan mode and when operation is stopped • Triggering condition Drain pump is turned on at the same time that the float switch is turned on. • Operation details When the float switch turns on continuously for 3 minutes, "failure indication" operates. There- after, even if the float switch turns off, the "failure indication"...

  • Page 39: Outdoor Unit Low Noise Operation

    7-12. Outdoor unit low noise operation The compressor frequency and outdoor unit fan speed are limited to reduce the operation noise by external input. Compressor Outdoor fan speed frequency Low noise mode Low noise mode Cooling/Dry Level 1 Heating AOHG36KBTB Cooling/Dry Level 2 Heating...

  • Page 40: Various Protections

    8. Various protections 8-1. Discharge gas temperature over-rise prevention control The discharge gas temperature sensor (discharge thermistor: outdoor unit side) detects the dis- charge gas temperature. • When the discharge temperature becomes higher than the trigger condition, the compressor fre- quency is decreased as the table below, and it continues to decrease until the discharge tempera- ture becomes lower than the trigger condition.

  • Page 41: Current Release Control

    8-3. Current release control The compressor frequency is controlled so that the outdoor unit input current does not exceeds cur- rent limit value set according to the outdoor temperature. The compressor frequency returns according to the operation mode, when the current becomes low- er than the release value.

  • Page 42: Indoor Unit Fan Motor Over Temperature Protection

    8-5. Indoor unit fan motor over temperature protection ¢ Compact cassette type When satisfy the following conditions, the protection works. • After the 90 seconds from the fan operation, detect less than 300 rpm for 10 seconds. • IPM trip protection works. •...

  • Page 43: High Pressure Protection

    8-7. High pressure protection Pressure switch: Off (Open: Higher than 4.2 MPa) Trigger condition Compressor stop Pressure switch: On (Close: Lower than 3.2 MPa) Release condition (3 minutes after compressor stop) Compressor restart 8-8. Low outdoor temperature protection When the outdoor temperature sensor detects lower than the trigger condition below, the compres- sor is stopped.
  • Page 44 AIR CONDITIONER 1 phase type Simultaneous operation multi type 2 . TROUBLE SHOOTING...
  • Page 45 2 ERROR DISPLAY 2-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY Check the Error LED display on the Indoor unit (IR Receiver *Option ) 1. Check ECONOMY (Green) LED Blinking, it means the Error on the system. (Not brinking: No Error) 2.
  • Page 46 2-2 TROUBLESHOOTING WITH ERROR CODE Indicate or Display: Trouble shooting 1 OUTDOOR UNIT Error Method: Error code : 11 Outdoor unit : No indication Serial communication error (Serial Reverse Transfer Error) Detective details: Detective Actuators: When the indoor unit cannot receive the serial signal from Outdoor unit Outdoor unit Main PCB more than 2minutes after power ON, or the indoor unit cannot receive Outdoor unit fan motor...
  • Page 47 Indicate or Display: Trouble shooting 2 Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 11 Serial communication error (Serial Forward Transfer Error) : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: When the outdoor unit cannot properly receive the serial signal from Indoor unit Controller PCB...
  • Page 48 Indicate or Display: Trouble shooting 3 Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 12 Wired Remote Controller Communication Error : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: Upon receiving the signal more than 1 time from Wired Remote or other Indoor Indoor unit Controller PCB unit, but the same signal has not been received more than 1 minute...
  • Page 49 Indicate or Display: Trouble shooting 5 Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 18 External communication error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: After receiving a signal from the external I/O PCB, External communication error the same a signal has not been received for 15sec Forecast of Cause :...
  • Page 50 Trouble shooting 6 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 23 Combination error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Indoor unit The outdoor unit receives the serial signal of applied refrigerant information from Indoor unit.
  • Page 51 Trouble shooting 7 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 26 Indoor unit address setting error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: When the address number set by auto setting and manual setting are Wired remote controller ( 2-Wire ) mixed in one RC group.
  • Page 52 Trouble shooting 8 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : Mode Error L1 L2 Connection unit number error (Indoor Error code : 29 unit in Wired remote controller system) : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Wired remote controller ( 2-Wire )
  • Page 53 Trouble shooting 9 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : Mode Error L1 L2 Error code : 32 Indoor unit PCB model information error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: When power is on and there is some below case.
  • Page 54 Trouble shooting 10 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 33 Indoor unit motor electricity consumption detection error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Indoor unit fan motor When the voltage value or the current value of the motor go beyond the limits.
  • Page 55 Trouble shooting 11 Indicate or Display: INDOOR UNIT Error Method: Error code : 35 Outdoor unit : No indication Manual auto switch Error Detective Actuators: Detective details: Indoor unit Controller PCB When the Manual Auto Switch becomes ON Indicator PCB for consecutive 60 or more seconds.
  • Page 56 Trouble shooting 12 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 39 Indoor unit power supply error for fan motor : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Indoor unit Power Supply PCB...
  • Page 57 Trouble shooting 13 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Indoor unit Communication circuit Error code : 3A (wired remote controller) error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Indoor unit Controller PCB circuit...
  • Page 58 Trouble shooting 14 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 41 Indoor Room Thermistor Error : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: Indoor unit Controller PCB Circuit Indoor unit thermistor is open or short is detected always.
  • Page 59 Trouble shooting 15 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 42 Indoor Heat Ex. Thermistor Error : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: Indoor unit Controller PCB Circuit Indoor unit thermistor is open or short is detected always.
  • Page 60 Trouble shooting 16 Indicate or Display: Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 51 Indoor Unit Fan Motor Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Indoor unit Power Supply PCB When the fan motor speed is less than 1/3 of the target fan speed for 56 seconds.
  • Page 61 Indicate or Display: Trouble shooting 17 Outdoor unit : INDOOR UNIT Error Method: Mode Error L1 L2 Error code : 53 Drain Pump Error : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: Indoor unit Controller PCB Circuit When Float switch is ON for more than 3 minutes.
  • Page 62 Trouble shooting 18 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor unit : Mode Error L1 L2 Outdoor unit main PCB model Error code : 62 information error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Access to EEPROM failed due to some cause after outdoor unit started.
  • Page 63 Trouble shooting 19 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 63 Inverter error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Outdoor unit Inverter PCB Error information received from Outdoor unit Inverter PCB Forecast of Cause : 1.
  • Page 64 Indicate or Display: Trouble shooting 20 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 64 PFC circuit error Detective Actuators: Detective details: When inverter output DC voltage is higher than 420V for over 3 seconds, Outdoor unit Main PCB the compressor stops.
  • Page 65 Trouble shooting 21 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 65 Trip terminal L error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Outdoor unit Main PCB When the signal from FO terminal of IPM is "L"(=0V) while the compressor stops.
  • Page 66 Trouble shooting 22 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 71 Discharge Thermistor Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Discharge temperature thermistor Discharge temperature thermistor short or open detected Forecast of Cause : 1.
  • Page 67 Trouble shooting 23 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 72 Compressor Temp. Thermistor Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Compressor temperature thermistor Compressor temperature thermistor short or open detected Forecast of Cause :...
  • Page 68 Trouble shooting 24 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 73 Heat Ex. Outlet / Middle Temp. Thermistor Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Heat exchanger Outlet / Middle temperature...
  • Page 69 Trouble shooting 25 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 74 Outdoor Thermistor Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Outdoor temperature thermistor Outdoor temperature thermistor short or open detected Forecast of Cause : 1.
  • Page 70 Trouble shooting 26 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 77 Heat Sink Thermistor Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Heat sink temperature thermistor Heat sink temperature thermistor short or open detected Forecast of Cause :...
  • Page 71 Trouble shooting 27 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 84 Current sensor error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: When Input Current Sensor has detected 1A or less, Outdoor unit Inverter PCB while Inverter Compressor is operating at higher than 50rps, after 1minute upon starting the Compressor.
  • Page 72 Trouble shooting 28-1 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 86 Pressure sensor error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: High pressure switch When the power was turned on, "high pressure switch : open"...
  • Page 73 Trouble shooting 28-2 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 86 Pressure sensor error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: 30 seconds or more after power-on, when pressure sensor detection Outdoor unit Main PCB value detects the condition below continuously for 30 seconds or more.
  • Page 74 Trouble shooting 29 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 94 Trip detection : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: "Protection stop by overcurrent generation after inverter compressor start Outdoor unit Inverter PCB processing completed'' generated consecutively 10 times.
  • Page 75 Trouble shooting 30 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor unit : Mode Error L1 L2 Compressor rotor position Error code : 95 detection error : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: Outdoor unit Inverter PCB "Protection stop by "overcurrent generation at inverter compressor starting"...
  • Page 76 Indicate or Display: Trouble shooting 31 Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 97 Outdoor Unit Fan Motor Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: When outdoor fan rotation speed is less than 100rpm in 20 seconds Outdoor unit Inverter PCB after fan motor starts, fan motor stops.
  • Page 77 Indicate or Display: Trouble shooting 32 Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : 99 4-Way Valve Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: When the indoor heat exchanger temperature is compared with Indoor Unit Controller PCB Circuit the room temperature, and either following condition is detected Heat Exchanger Temperature Thermistor...
  • Page 78 Trouble shooting 33 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : A1 Discharge Temp. Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: °C "Protection stop by "discharge temperature during compressor Discharge temperature thermistor...
  • Page 79 Trouble shooting 34 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : A3 Compressor Temp. Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: °C "Protection stop by "compressor temperature during compressor Compressor temperature thermistor...
  • Page 80 Trouble shooting 35 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : A5 Low pressure Error : Light OFF : Light ON n : n times blinking Detective Actuators: Detective details: Pressure sensor "Protection stop by suction pressure 0.02MPa continued for 5 minutes"...
  • Page 81 Trouble shooting 36 Indicate or Display: Outdoor unit : OUTDOOR UNIT Error Method: Mode Error L1 L2 Error code : AC Heat sink Temp. Error : Light OFF : Light ON n : n times blinking Detective details: Detective Actuators: Outdoor unit Inverter PCB "Protection stop by "heat sink temp.
  • Page 82 2-3 TROUBLESHOOTING WITH NO ERROR CODE Forecast of Cause: Trouble shooting 37 1. Power Supply failure 2. External cause Indoor Unit - No Power 3. Electrical Components defective Check Point 1 : Check Installation Condition Isn’t the breaker down? Check loose or removed connection cable. >>If abnormal condition is found, correct it by referring to Installation Manual or Data &...
  • Page 83 Forecast of Cause: Trouble shooting 38 1.Power Supply failure 2. External cause Outdoor unit - No Power 3.Electrical Components defective Check Point 1 : Check Installation Condition Isn’t the breaker down? Check loose or removed connection cable. >>If abnormal condition is found, correct it by referring to Installation Manual or Data &...
  • Page 84 Trouble shooting 39 Forecast of Cause: 1. Setting/ Connection failure 2. External cause No Operation (Power is ON) 3. Electrical Component defective Check Point 1 : Check indoor and outdoor installation condition Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control. Or, check if there is an open cable connection.
  • Page 85 Forecast of Cause: Trouble shooting 40 1. Indoor Unit error 2. Outdoor Unit error No Cooling / No Heating 3. Effect by Surrounding environment 4. Connection Pipe / Connection Wire failure 5. Refrigeration cycle failure Check Point 1 : Check Indoor Unit Does Indoor unit FAN run on HIGH FAN? Is Air Filter dirty? Is Heat Exchanger clogged?
  • Page 86 Forecast of Cause : Trouble shooting 41 1. Abnormal installation (Indoor/ Outdoor) Abnormal Noise 2. Fan failure (Indoor/ Outdoor) 3. Compressor failure (Outdoor) Diagnosis method when Abnormal Noise is occurred Abnormal noise is coming from Indoor Unit. Abnormal noise is coming from Outdoor Unit. (Check and correct followings) (Check and correct followings) Is Main unit installed in stable condition?
  • Page 87 2-4 SERVICE PARTS INFORMATION SERVICE PARTS INFORMATION 1 Compressor Diagnosis method of Compressor ( If Outdoor Unit LED displays Error, refer to Trouble shooting ) Abnormal noise Stops soon after starting up Does not start up Is there open or loose connection Check if vibration noise by Is there open or loose connection cable?
  • Page 88 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check Connection Check terminal connection of Compressor (loose or incorrect wiring) Terminal cover opened Inverter PCB W(C) U(R) (BLACK) (RED) W400 W401 W402 V(S) (WHITE) BLACK WHITE Compressor Check Point 2 : Check Winding Resistance Check winding resistance of each terminal If the resistance value is 0 or infinite, replace Compressor.
  • Page 89 SERVICE PARTS INFORMATION 3 Outdoor unit Electronic Expansion Valve ( EEV ) Check Point 1 : Check Connections Check connection of connector ( Loose connector or open cable ) EXPANSION VALVE COIL BLUE ORANGE YELLOW WHITE Check Point 2 : Check Coil of EEV Check Point 3 : Check Noise at start up Remove connector, check each winding Turn on Power and check operation noise.
  • Page 90 SERVICE PARTS INFORMATION 4 Indoor unit fan motor Check Point 1 : Check rotation of Fan Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor) >>If Fan or Bearing is abnormal, replace it. Check Point 2 : Check resistance of Indoor unit Fan Motor Refer to below.
  • Page 91 SERVICE PARTS INFORMATION 8 Thermistor Check Point : Check Thermistor resistance value Remove connector and check Thermistor resistance value. Resistance Value [ k ] Temperature [°C] Thermistor A Thermistor B Thermistor C Thermistor D 1013.1 95.6 224.3 94.3 531.6 50.3 115.2 49.6 292.9...
  • Page 92 3-3-17,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan May. 2020 Printed in Japan...

This manual is also suitable for:

Ao g45kbtb seriesAo g54kbtb seriesAuxg18kvlaAuxg22kvlaAuxg24kvlaArxg18kllap ... Show all

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