Bosch B26FT70SNS Repair Manual
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Bosch B26FT70SNS Repair Manual

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Summary of Contents for Bosch B26FT70SNS

  • Page 1 Repair Manual B26FT70SNS...

  • Page 2: Table Of Contents

    C O N T E N T S 1. WARNINGS AND PRECAUTIONS FOR SAFETY ------------------------------------------------ 2. EXTERNAL VIEW 2-1. External Size -------------------------------------------------------------------------------------------- 2-2. Name of Each Parts ------------------------------------------------------------------------------------ 2-3. Cold Air Circulation ------------------------------------------------------------------------------------ 3. SPECIFICATION ------------------------------------------------------------------------------------------- 4. OPERATION AND FUNCTIONS 4-1.
  • Page 3 C O N T E N T S 9. COOLING CYCLE HEAVY REPAIR 9-1. Summary of Heavy Repair ------------------------------------------------------------------------ 9-2. Precaution during Heavy Repair ----------------------------------------------------------------- 9-3. Practical Work for Heavy Repair ----------------------------------------------------------------- 9-4. Standard Regulations for Heavy Repair -------------------------------------------------------- 9-5. Brazing Reference Drawing ----------------------------------------------------------------------- 10-1.

  • Page 4: Warnings And Precautions For Safety

    1. WARNINGS AND PRECAUTIONS FOR SAFETY Please observe the following safety precautions in order to use safely and correctly the refrigerator and to prevent accident and danger during repair. 1. Be care of an electric shock. Disconnect power cord from wall outlet and wait for more than three minutes before replacing PCB parts.

  • Page 5: External View

    2. EXTERNAL VIEWS 2-1. External Size...

  • Page 6: Name Of Each Parts

    2-2. Name of Each Parts REFRIGERATOR COMPARMENT FREEZER COMPARTMENT 1. ICE CUBES STORAGE CASE 8. WATER/ICE DISPENSER 14. CASE F 2. SHELF R SM 9. POCKET SM 15. CASE F DRAW 3. REFRIGERATOR LAMP 10. POCKET GALLON 16. FREEZER LAMP 4.

  • Page 7: Cold Air Circulation

    2-3. Cold Air Circulation Refrigerator Compartment Freezer Compartment...

  • Page 8: Specification

    3. SPECIFICATION Item Specification Model Name B20CS50SN* Total 734.5Li (25.94 ft Gross Volume Freezer 216.7 Li (7.65 ft (Li) Refrigerator 517.8Li (18.28ft External Dimension 914mm * 858.4mm *1773.2mm(w/o Handle) (Width * Depth * Height) Rated Voltage 115~120V (60Hz) Weight 145kg Model VEGZ 6H Motor Type...
  • Page 9 Item Specification Model Name RFS-702ETU Defrost PBN-43B Freezer PT-38 Refrigerator PBN-43B Ice Maker PT-38 PBN-43B Vita Box PBN-43B Sheath F AS AC115V / 200W Sheath R AS AC115V / 200W R Motor AS(In URT) AC115V / 10W R Motor AS(Behind EVA) AC115V / 7W R Return Duct AS AC115 / 7W...

  • Page 10: Operation And Functions

    4. OPERATION AND FUNCTIONS 4-1. Display INPUT CONTROL OBJECT Front PCB button Freezer Set , Fridge Set Qucik ice , Light/Filter FCP C-LED Water, Crushed ice, Cube ice Alarm/Lock CONTENTS REMARKS Water Crushed ice Cube ice Alarm/Lock Quick ice Light/Filter Temperature adjustment button Temperature adjustment button for freezer compartment.
  • Page 11 CONTENTS REMARKS 3. “Fridge Set” button. 1) Temperature control of Fridge compartment 2) 8 step mode of successive temperature mode. 3) Initial mode by power input : “39℉” ※Whenever Touch button, setting is repeated in the order of (39℉) → (37℉) → (35℉) → (35℉) → (47℉) → (45℉) → (43℉) →. (41℉) 4) When super mode(3th press) is chosen, the icon (Super Fridge) is ON, and the icon is off when released.
  • Page 12 CONTENTS REMARKS 9. “Alarm/Lock” button 1) When the alarm sounds, touch “Alarm/Lock” will stop alarming sounds. 2) This button stops operation of different button ① If you touch “Alarm/Lock” button for 2sec, “Alarm/Lock” icon is on. ② Press this button to lock out this case and to keep temperature and function setting.

  • Page 13: Control Of Vita Fresh

    4. OPERATION AND FUNCTIONS 4-2. Control of Vita Fresh INPUT CONTROL OBJECT Vita Sensor Vita Damper RT Sensor R-ice Fan Compressor CONTENTS REMARKS 1. Vita Sensor on/off Setting Value of Vita Fresh Room 1) Normal operation or refrigeration operation of Ice maker room RT-S 59℉(15℃) ↓...

  • Page 14: Defrost Mode

    4-4. Defrost Mode INPUT CONTROL OBJECT 1. Comp 2. F/R-ICE/C Fan 1. Defrosting Cycle 3. FD/RD Heater CONTENTS REMARKS 1. Defrost Mode Heater Heater Defrosting Defrosting 1) Comp, F/R-ICE/C Fan : OFF R/Vita Damper : CLOSE FD/RD Heater : ON 2) Time limit 30 seconds : Heater is ON regardless of D-sensor temperature right after defrosting start...
  • Page 15 CONTENTS REMARKS 4. Flow Chart of Defrosting Start Start Comp. operating time is over 2 hours? Total time is over 60 hours? Comp. operating time is over 20 hours? Comp. continuing Operating Time for 8 hours? Comp. operating time is over 6 hours? Any error ? Defrosting start...

  • Page 16: Forced Defrosting Mode

    4-5. Forced Defrosting Mode INPUT CONTROL OBJECT 1. Comp 2. F/R-ICE/C Fan 1. Defrosting Cycle 3. FD/RD Heater CONTENTS REMARKS 1. A/S Defrosting Mode (Heater defrost → Pause → Fan Delay) Heater Heater Defrosting Defrosting 1) Comp, F/R-ICE/C Fan : OFF R/Vita Damper : CLOSE FD/RD-Heater : ON 2) Time limit...

  • Page 17: Dv Heater, Water Tank Heater, Dispenser Heater And Flap Heater Control

    4-7. DV Heater, Water Tank Heater, Dispenser Heater and Flap Heater Control INPUT CONTROL OBJECT 1. Comp DV Heater Water Tank Heater 2. R-Sensor, RT-Sensor Dispenser Heater Flap Heater CONTENTS REMARKS 1. They are linked with comp by Fridge set Fridge set 35℉...

  • Page 18: Control Of Interior Lights

    4-10. Control of Interior Lights INPUT CONTROL OBJECT 1. Refrigerator door switch Lamp 2. Freezer door switch 3. Water, Crushed ice, Cube ice switch CONTENTS REMARKS 1. Control Refrigerator Compartment Lights. R-Lights turn ON/OFF by R-door switch ON/OFF (※ For 20 minutes after sensing door open, the lights turn off automatically through door close is not sensed.) 2.

  • Page 19: Compensation Of R-Sensor On/Off Temp

    4-12. Compensation of R-sensor ON/OFF Temp. INPUT CONTROL OBJECT Resistance of R-sensor Main PCB ON/OFF Temp. of Refrigerator CONTENTS REMARKS Compensation of R-sensor ON/OFF temp. (down) In case temperature of refrigerator compartment is weak or insufficient, take the following action. R-SENSOR (31.4㏀) (2㏀)

  • Page 20: Control Flow & Time Chart

    4-13. Control flow & Time chart. INPUT CONTROL OBJECT Dispenser Lamp Dispenser S/V Valve Water/Crushed ice/Cube ice Gear Motor Cube S/V Water(Dis) S/V CONTENTS REMARKS 1. Control flow & time chart ① Crushed Ice ② Cube Ice ③ Water Delay time : A = 0.5sec , B =0. 5sec , C = 2.0sec , D = 5.0sec , E=0.3sec, F=0sec...

  • Page 21: Error Display

    4-14. Error Display INPUT CONTROL OBJECT Temperature Control Buttons 88 Display CLED CONTENTS REMARKS 1. How to start 1) Under “Lock” mode, press “Quick ice” button 5 times while touch “Freezer Set” and “Fridge Set” button at the same time. 2) The front C-LED displays as the right diagram shows ( [Ex.] Time Display of 0003 signifies 3 minutes of power on time.) 3) Press “Freezer Set”...
  • Page 22 CONTENTS REMARKS 5. Control way of Error (if any) 1) “F1” error Cause : F-sensor disconnection or short Check point : Measure the resistance between both terminals after separating CN14 of the Main PCB. If F-sensor is disconnected or shorted , change the F-sensor in the freezer compartment. How to reset : If F-sensor is normal, the error is terminal temperature.
  • Page 23 CONTENTS REMARKS 8) “C1” error Cause : in case comp. works for over 3 hours when FD-S or RD-S temp. is over 23 ℉ Check point : Refrigerant leakage. 9) Door error (“dF” “dR” on display) Cause : in case it senses that door is open for more than 1 hour. Check point : F/R door is opened or not.

  • Page 24: Summary Of Function

    4-15. Summary of Function INPUT CONTROL OBJECT Each button CONTENTS REMARKS 1. All the modes are started “Lock” mode (except “Water Filter Reset” mode) 2. Element A/S Function Temp Display change “Quick ice” button for 15 seconds Forced Defrosting “Freezer Set” + “Fridge Set” 5 times Reset water filter “Light/Filter”...

  • Page 25: Filter Information & Function To Adjust The Amount Of Water

    4-16. Filter information & Function to adjust the amount of water INPUT CONTROL OBJECT Temperature Control Buttons 88 Display CLED CONTENTS REMARKS Filter information 1. Filter Exchange Information : Record a real-time from the point of power input. - The filter is normal for 6 months after the first installation. - When the time comes to change or reset, press the Light/Filter button for 3 seconds.

  • Page 26: Compensation Of F/R-Compartment Temperature

    4-17. Compensation of F/R-Compartment temperature. INPUT CONTROL OBJECT Front PCB button ON/OFF Temp. of Freezer Set , Refrigerator Set Freezer & Refrigerator Compartment Super Freeze , Super Cool Dispenser , Lock CONTENTS REMARKS 1. How to start 1) Freezer Compartment : Under “Lock” mode, press “Light/Filter” button 5 times while pressing “Quick ice”...

  • Page 27: Wiring Diagram

    5. WIRING DIAGRAM...

  • Page 28: Component Locate View

    6. COMPONENT LOCATE VIEW 6-1. Refrigerator Compartment R LAMP R SENSOR R DR *R SWITCH R DR *L SWITCH WATER FILTER ICE MAKER VITA FRESH ROOM MEAT KEEPER FRONT CONTROL PANEL...

  • Page 29: Freezer Compartment

    6-2. Freezer Compartment F DRAW CASE F CASE ICE TRAY R D SENSOR R FAN F TEMP FUSE F FAN R TEMP FUSE F D SENSOR F LAMP F SENSOR R DEFROST F DEFROST F DR SWITCH HEATER HEATER EVAPORATOR...

  • Page 30: Automatic Ice Maker Compartment

    6-3. Automatic Ice Maker Compartment AUTOMATIC ICE COLD AIR MAKER OUTLET SOLENOID ICE MAKER VALVE SENSOR GEARED MOTOR 6-4. Machine Compartment POWER CORD COMPRESSOR INVERTER DRYER TRAY DRIP CONTROL BOX C FAN MOTOR WATER VALVE CONDENSER...

  • Page 31: How To Check Each Parts

    7. HOW TO CHECK EACH PARTS 7-1. Hose Ice Maker Tube Assembly 1) Disassembling Procedure DISASSEMBLING PROCEDURE DISASSEMBLING PROCEDURE ▷Remove 2 screws at the Cove ▷Pull forward Ice Storage Case Guide Cab W/Tube A. ▷Disassemble insulator & ▷ Pull forward Ice Maker Cover Guide Cab W/Tube A ▷Disconnect housing on the backside ▷Pull forward Hose Ice Maker Tube As.

  • Page 32: Geared Motor Assembly

    7-2. Geared Motor Assembly 1) Disassembling Procedure DISASSEMBLING PROCEDURE DISASSEMBLING PROCEDURE ▷Disassemble Ice Maker. ▷Unscrew (2 ea).and pull forward Geared Motor ▷Check Solenoid Valve and Geared Motor. 2) How to Check Geared Motor Assembly PARTS SPEC. HOW TO CHECK CRITERION ▷SPEC.

  • Page 33: Dispenser Solenoid Valve

    7-3. Dispenser Solenoid Valve 1) Disassembling Procedure DISASSEMBLING PROCEDURE DISASSEMBLING PROCEDURE ▷Separate 2 terminals from Sol Valve and ▷Unscrew (1ea) to remove F-PCB Panel. Housings from Cover Ice Flap. ▷ Separate 2 housings from Front PCB. ▷Unscrew (2ea) to remove Sol Valve. (Do not hold only wires to pull out.) ▷Unscrew (2ea) to remove Box Dispenser Shut.

  • Page 34: Main Pcb

    7-4. Main PCB ■ Model : FRS-702ETU MICOM Item Check Point Remark Compensation for * Used when making R-temp. down weak refrigeration to compensate for weak refrigeration →Making R-temp without changing FCP temp. setting. cooler ※Cutting of J1 ⇒ down by 1.5 ℃ J1,J2 ※Cutting of J1, J2 ⇒...

  • Page 35: Ice Maker

    7-5. Ice Maker 1) Disassembling procedure Disassembling procedure Disassembling procedure ▷ Remove Window R Lamp ▷Disassemble Housing(4ea). and 2 screws on top inner surface of R room. ▷Unscrew (1 ea) on side inner left surface ▷ Disassemble Base F Lamp & PCB housing.. of Box Ice Maker.
  • Page 36 2) How to check ice maker Parts How to check Criterion Ice Maker Switch Ice Maker AS ▷ GOOD : PLATE operated up and down 1 time by rotation of the CAM when pushing the button ▷ DEFECTIVE : all situations except upper PLATE LEVER ICE...

  • Page 37: Trouble Diagnosis

    8. TROUBLE DIAGNOSIS 8-1. Faulty Start (F/R lights OFF , F-PCB Power OFF) Start Power input to Main PCB is ok? Check power connection from machine compartment to CN1 of Main PCB. Main PCB Fuse is disconnected? Change the fuse (AC250V 4A) (on the Main PCB) Voltage...
  • Page 38 8-2. Freezer Compartment 8-2-1. Freezing failure . (Foods are not frozen / cold.) Start Any error code on Front PCB? Refer to error display in operation and function Does Comp. work? OLP/PTC is OK? Change the Comp. Change OLP/PTC Change the F-Fan &...
  • Page 39 Removing and replacing Freezer parts 1) Disassembling F Door procedure (1) Remove foods. (2) Remove F Draw Case & F Case in freezer compartment. Pull up F Draw Case and remove Push lock(both side) and pull forward F Door and Pull up F Case remove F Door AS and remove...
  • Page 40 Removing and replacing Freezer parts 3) Disassembling F Louver AS procedure * Remove Screws (2ea) of F-Louver A. * Pull forward top of F Louver. * Remov e the scre w cap (2ea) on the F-Louver A with a flat tip driver. * Disassemble housing * Separate F Louver AS.
  • Page 41 Removing and replacing Freezer parts 5) Disassembling R Fan AS procedure * Remove screws(2ea) of Eva. * Remove screws(3ea) of Fixture R * Remove Housing R Fan AS. Motor B. * Pull forward R Fan AS. * Separate R Fan AS. 6) Disassembling EVA AS &...
  • Page 42 8-2-2. Ice Formation on F-Louver Start Dews are formed on the Gasket has a gap Remove the gap. gasket surface inside between cabinet ? F-compartment ? Door is hanged Reassemble the door. down ? Door is open and closed too frequently ? Explain not to open doors too frequently.
  • Page 43 8-2-3. Disconnection / breaking of Freezer Lights Ass’y Start Power of F-Lamp Is OK ? (DC12V) Check the power connection? (From Main PCB to F-Lamp) Freezer Lamp Ass’y Is brocken? Change the Lamp Ass’y. Connection of F door switch is OK ? Repair the F-door switch.
  • Page 44 8-3. Refrigerator Compartment 8-3-1. Refrigeration failure (Foods does not get cool or cold soon.) Start ※ Refer to the Error Display Any error mode on Front PCB? Solve error code problem, if any. Change R-Fan R-Fan motor the R-Fan motor. works ok ? is ok? Wiring connection...
  • Page 45 Removing and replacing Refrigerator parts 1) Disassembling R Door procedure * Disconnect housing and water * Remove Scr ews (1ea) of clip and remove the clip. hose. * Remove Bolt(1ea) of H inge *T and * Pull u p the door a nd rem ove the remove the Hinge *T.
  • Page 46 Removing and replacing Refrigerator parts 2) Disassembling Multi-Duct procedure Insulator C * Remove tape. * Open Insulator C * Separ ate C over Multi D uct with Insulator. * Separate Damper for Vita F resh Room. * Separate Insulator C. * Separate Damper for R Room.
  • Page 47 8-3-2. Disconnection / Breaking of Refrigerator Lights Wires Start Power of F-Lamp Is OK ? (DC12V) Check the power connection? (From Main PCB to R-Lamp) R Lamp Ass’y Is brocken? Change the Lamp Ass’y. Connection of R door switch is OK ? Repair the R-door switch.
  • Page 48 8-3-3. Dews on Refrigerator Compartment Start Dews are formed Gasket has on the gasket inside Repair to eliminate the gap. Any gap ? R-compartment? Door is Reassemble the doors. hanged down ? Door is open too long ? Explain not to open doors too long.
  • Page 49 8-4. Operation Noise of Refrigerator 8-4-1. Comp. operation Noise Start Refrigerator is leveled ? Level the refrigerator by adjusting wheels. ☞ Refer to User’s Guide and SVC Manual. Front cover or door gasket is assembled wrong ? Set it right. Rubber absorber comp is distorted or aged ? Change the Rubber absorber.
  • Page 50 8-4-2. Refrigerant Flow Sound Start Water flowing or hiss sounds from the refrigerator ? Attach an absorber gum on the capillary tube. Refrigerant sound of hiss or sizzling sound when comp. starts ? Apply a gum on the accumulator. Refrigerant sound of hiss or sizzling when comp.
  • Page 51 Troubleshooting of Evaporator Sound 1. Hiss Sound from Capillary Tube 1) “I” tube is used to connect the “I” tube capillary tube and evaporator. (2 welding points : ①, ②) 2) When such a sound is made, attach a absorber on the tube including 2 welding points.
  • Page 52 8-4-3. Fan Noise Start Fan is damaged or transformed ? Change the fan. Fan is touching the surround ? Set it right not to touch. Fan-motor assembly is moving or shaking ? Set it right not to move. Motor has its own noise or vibration when working ? Change the motor assembly.
  • Page 53 8-4-4. Pipe Noise Start Pipes are touching in the machine compartment ? Separate the touching pipes, if any. Tray drip makes noise by Condenser shaking ? Apply cushion material between Comp. base and Tray drip. Pipe itself is shaking much ? Move or change the points of vibration absorber rubbers on the pipes to reduce the shaking.
  • Page 54 8-5. Door 8-5-1. Door Opening Alarm Continues though the door is closed. Start Check if F & R Lamp is ON. Door switch is pushed well ? Attach a thin pad on the door liner or change the door assembly. Door switch is soaked with water or there is water in the switch ?

  • Page 55: Cooling Cycle Heavy Repair 9-1. Summary Of Heavy Repair

    9. COOLING CYCLE HEAVY REPAIR 9-1. Summary of Heavy Repair Process Contents Tools Remove * Cut charging pipe ends (Comp. & Dryer) and refrigerant * Nipper, side cutters discharge refrigerant from dryer and compressor. Residuals * Confirm refrigerant (R-134a or R-600a) and oil for compressor and dryer.

  • Page 56: Precaution During Heavy Repair

    9-2. Precautions During Heavy Repair Items Precautions Use of tools. 1) Use special parts and tools for R-134a or R-600a 1) Remove retained refrigerant more than 5 minutes after turning off a refrigerator. (If not, oil will leak inside.) Removal of retained 2) Remove retained refrigerant by cutting first high pressure side refrigerant.

  • Page 57: Practical Work For Heavy Repair

    9-3. Practical Work for Heavy Repair Items Precautions 1. Removal of residual refrigerant. 1) Remove residual refrigerant more than 5 minutes later after turning off the refrigerator. ( If not, compressor oil may leak inside.) 2) Remove retained refrigerant slowly by cutting first high pressure side (dryer part) with a nipper and then cut low pressure side.
  • Page 58 Items Precautions * Pipe Connection Connect a red hose to the high pressure side and a blue hose 3.Vacuum degassing. to the low pressure side. * Vacuum Sequence Open ①,② valves and evacuate for 40 minutes. Close valve ①. ※ KEYPOINTING 1) If power is applied during vacuum degassing, vacuum degassing shall be more effective.

  • Page 59: Standard Regulations For Heavy Repair

    Items Precautions 4.Refrigerant charging. 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch a charging pipe with a pinch-off plier after completion of charging. 6) Braze the end of a pinched charging pipe with copper brazer and take a gas leakage test on the welded parts.

  • Page 60: Brazing Reference Drawing

    9-5. Brazing Reference Drawings. ▶ Welding Point Copper Welding (Ag 5%) 7 Points Silver Welding (Ag 35%) 3 Points ▶ Flow of Refrigeration Cycle High...
  • Page 61 10-1. Dispenser Water Flow...
  • Page 62 For additional assistance, please contact our Technical Support Team at 800 444-9091. Visit QuickFinder at http://portal.mch.bshg.com/portal. BSH Home Appliances Corporation 58300000149620 ARA EN B 5551 McFadden Ave., Huntington Beach, CA 92649 April 2011...

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