LG LFXS32726 Series Service Manual
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LG LFXS32726 Series Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL : LFXS32726*
COLOR : STAINLESS(ST)
LFXS32736*
BLACK STAINLESS(SW)

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Summary of Contents for LG LFXS32726 Series

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MODEL : LFXS32726* COLOR : STAINLESS(ST) LFXS32736* BLACK STAINLESS(SW)

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS ................................3 2. PARTS IDENTIFICATION ..............................4 3. DISASSEMBLY ................................5-19 REMOVING AND REPLACING REFRIGERATOR DOORS ..................... 5 DOOR ....................................6 SUB PCB FOR WORKING DISPENSER ..........................7 DOOR ALIGNMENT ................................8 FAN AND FAN MOTOR ..............................8 DEFROST CONTROL ASSEMBLY ...........................

  • Page 3: Specifications

    1. SPECIFICATIONS 1-1 LFXS32726*, LFXS32736*  31.7cu.ft ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type 3 /4 1 /8 1 /4 DIMENSIONS (inches) X 37 X 70 (WXDXH) 31.7cu.ft COMPRESSOR Linear NET WEIGHT (pounds) 154kg (339lb) EVAPORATOR Fin Tube Type COOLING SYSTEM...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION NOTE Icemaker Ice Bin Ice Compartment Door - 4 -...

  • Page 5: Disassembly

    3. DISASSEMBLY 3-1 REMOVING AND REPLACING REFRIGERATOR DOORS  Removing Refrigerator Door CAUTION: Before you begin, unplug the refrigerator. Remove food and bins from doors. ▶ Left Door -FIG. 2 1. Disconnect water supply tube by pushing back on the disconnect ring (3).-FIG. 1 2.

  • Page 6: Door

    3-2 DOOR  Door Gasket Replacement 1. Insert gasket into channel  Mullion Removal Insert and press gasket into channels at doorliner. 1. Remove 2 screws. 2. Lift mullion up carefully.  Mullion Replacement 1. Connect wire harness. 3. Disconnect wire harness. 2.

  • Page 7: Sub Pcb For Working Dispenser

    - 7 -...

  • Page 8: Door Alignment

    3-4 Door Alignment * Ice Fan Assembly Replacement If the level of refrigerator doors is uneven, follow the 1) Remove the plastic guide for slides on left side by instructions below to align the doors: unscrewing phillips head screws. Turn the leveling legs (CW) to raise or (CCW) to lower the 2) Pull out the cover sensor to disassemble by using tools height of the front of the refrigerator by using flat blade shown in the figure.

  • Page 9: Refrigeraotr Light

    3-7 Refrigerator Light (Top) 3-7-2 Refrigerator Light (Side) Unplug Refrigerator, or disconnect power at the circuit 1. Unplug refrigerator power cord from electric outlet. breaker. 2. Put flat screwdriver into sevice hole and remove cover of If necessary, remove top shelf or shelves. refrigerator light.

  • Page 10: Multi Duct

    3-8 MULTI DUCT 3-7-3 Cap Decor LED LAMP(Bottom) 1. Unplug refrigerator power cord from electric outlet. 1. Remove 2 screws and guide rail. 2. Open the refrigerator door to need diassembly. 3. Put flat screwdriver into service hole, remove the cover of cap decor LED LAMP.

  • Page 11: Dispenser

    3-9 DISPENSER 3-11 ICE BUTTON ASSEMBLY 1) Remove the 1 screw holding the lever. 2) Remove the spring from the hook. 3) Push and pull on the tab to remove. 2) Holding the inner side of 1) Pull out the drain the dispenser pull Button Lever forward to remove.

  • Page 12: Icemaker Replacement

    3-14 Icemaker replacement 1) Remove 3 screws marked in the picture below. 2) Grasp the bottom of motor cover assembly and pull it out slowly to remove. 3) Disconnect wire harness from wall of compartment. - 12 - - 12 -...

  • Page 13: Cap Duct Motor Replacement

    3-15 CAP DUCT MOTOR REPLACEMENT 1) Separate the Housing of the Cap Duct Motor. 2) Unscrew 3 screws to disassemble the motor. 3) When replacing the motor, check the position of the door duct and the link for proper fit. Duct Door Link Cap Duct Motor...

  • Page 14: How To Remove A Ice Bin

    3-16 HOW TO REMOVE ICE BIN 3-17 HOW TO PLACE ICE BIN IN POSITION 1) Grip the handles, as shown in the picture. 1) Insert the Ice Bin, slightly tilting it to avoid touching the Icemaker. (Especially, Ice-Detecting Sensor) Note) Before remove ice bin, put on clean golves for 2) Lift the lower part slightly.

  • Page 15: Pull Out Drawer

    3-18 PULL OUT DRAWER Top Drawer 1. Use a flat blade screwdriver to push the tab in on the left rail and push the tab on the right rail in with your finger. Once the tabs have been pushed in, you can lift the tray up and out. 2.

  • Page 16: How To Remove And Reinstall The Pullout Drawer

    3-19 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-19-1 Follow Steps to Remove Step 1) Open the freezer door. Step 2) Remove the lower basket. Step 3) Remove the two screws from the guide rails (one Step 4) Removal of the freezer door is done by l ifting clear of the rail support.
  • Page 17 3-19-2 Follow Steps to Reinstall Step 1) Insert both side of supporter cover tv into connector Step 2) Assemble a bar and gear ice with screw. rails, and then screw them. Push the otherside of the gear to inside of the bar.

  • Page 18: Water Valve Disassembly Method

    3-20 WATER VALVE DISASSEMBLY METHOD 3-21 FAN AND FAN MOTOR DISASSEMBLY METHOD 1) Turn off the water to unit. Remove the waterline from the 1) Remove screws for the Drain Pipe Assembly and the 1 valve. connected to the Motor Cover. MOTOR COVER 2) Separate the Fan Assembly and Motor, turn counter 2) Remove cover and 1 screw from the valve.

  • Page 19: Caution : Sealed System Repair

    CAUTION : Sealed System Repair 3-22 Before making a sealed system repair : Start with the power cord unplugged from the outlet. Plug in the power cord and between 6 and 12 seconds after it has been pugged in, unplug it from the power source. this will allow both sides of the 3 way valve to be opened to allow for proper evacuation.

  • Page 20: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2 Compressor protection logic Since linear Comp conducts linear reciprocating motion, 4-1-1 Role we have protection logic for compressor, motor and PCB The compressor intakes low temperature and low pressure as the below. gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas.

  • Page 21: Circuit Diagram

    5. CIRCUIT DIAGRAM - 21 -...

  • Page 22: Troubleshootintg

    6. TROUBLESHOOTING - 22 -...
  • Page 23 - 23 -...

  • Page 24: Pcb Picture

    7. PCB Picture 7-1. Main PCB ( P/N : EBR78940625) ( P/ P P N / / : EBR78940625) CON7 CON201 CON6 CON3 CON2 CON1 CON5 7-2. Display PCB ( P/N : EBR79159702) CON802 CON102 CON101 CON3 CON103...
  • Page 25 7-3. Sub PCB (P/N : EBR76468402)

  • Page 26: Troubleshooting

    8. Trouble Shooting 8-1. Freezer Sensor Error (E FS) Symptom Check Point 1. E FS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin & 18 Other Normal CON7...
  • Page 27 Freezer Sensor Error (E FS) Change the Reconnect or Sensor Is the Connector disconnected Check the Temperature and repair the or loose between Main PCB and resistance refer to the table. connector sensor? No problem? CON7 Change the Sensor Check the Sensor resistance. Is resistance 0Ω...
  • Page 28 8-2. Refrigerator Sensor Error (E rS) Symptom Check Point 1. E rS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin & 16 Other Normal CON7 Resistance [Ω]...
  • Page 29 Refrigerator Sensor Error (E rS) Change the Reconnect or Sensor Is the Connector disconnected repair the Check the Temperature and or loose between Main PCB and connector resistance refer to the table. sensor? No problem? CON7 Change the Sensor Check the Sensor resistance. Is resistance 0Ω...
  • Page 30 8-3. Icing Sensor Error (E IS) Symptom Check Point 1. E IS 1. Check f or a loose connection 2. Check Sensor Resistance CON7 CON201 CON5 CON6 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON5 Open pin & 12 Other Normal CON5 Resistance [Ω]...
  • Page 31 Icing Sensor Error (E IS) Change the Reconnect or Sensor Is the Connector disconnected Check the Temperature and repair the or loose between Main PCB and resistance refer to the table. connector sensor? No problem? CON5 Change the Sensor Check the Sensor resistance. Is resistance 0Ω...
  • Page 32 8-4. Defrost Sensor Error (F dS) Symptom Check Point 1. F dS 1. Check f or a loose connection 2. Check Sensor Resistance Defrost Controller CON7 CON201 CON6 CON7 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin & 20 Other Normal CON7...
  • Page 33 Defrost Sensor Error (F dS) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB, Is resistance normal? connector Def rost controller and Sensor? CON7 Check the Temperature and resistance ref er to the table. No problem? CON7 Resistance [Ω]...
  • Page 34 8-5. Defrost Sensor Error (r dS) Symptom Check Point 1. r dS 1. Check f or a loose connection 2. Check Sensor Resistance Defrost Controller CON7 CON201 CON6 CON7 CON3 CON2 CON1 CON5 Resistance [Ω] Short CON7 Open pin & 14 Other Normal CON7...
  • Page 35 Defrost Sensor Error (r dS) Reconnect or Is the Connector disconnected Check the Sensor resistance. repair the or loose between Main PCB, Is resistance normal? connector Def rost controller and Sensor? CON7 Check the Temperature and resistance ref er to the table. No problem? CON7 Resistance [Ω]...
  • Page 36 8-6. Defrost Heater Error (F dH) Symptom Check Point 1. F dH 1. Check the door gasket 2. Check the def rost control parts 3. Check the PCB output voltage 4. Check def rost heater Defrost Control Parts Defrost Heater #2 Defrost Defrost Heater #1...
  • Page 37 Defrost Error (F dH) Input test mode 3. (Push the test button 3 time) 1. Check the Replace the Check the door gasket. oulet voltage. door gasket. Check the input voltage into heater. Is door gasket damaged? 2. Replace Is input voltage f ollow below table? Main PCB.
  • Page 38 Reconnect Replace Is the connector properly Is the resistance of def rost sensor def rost connected? f ollow below table? sensor Replace Fuse-M Is the resistance of Fuse-M less than 0.2Ω? Defrost Sensor Fuse-M Explain to customer Such error message may be displayed when the gasket contact of the door is poor, or if too much hot f ood is inserted into the ref rigerator.
  • Page 39 8-7. Defrost Heater Error (r dH) Symptom Check Point 1. r dH 1. Check the door gasket 2. Check the def rost control parts 3. Check the PCB output voltage 4. Check def rost heater Defrost Control Parts Defrost Heater Fuse-M Defrost Sensor...
  • Page 40 Defrost Error (r dH) Input test mode 3. (Push the test button 3 time) 1. Check the Replace the Check the door gasket. input voltage. door gasket. Check the def rost control parts. Is door gasket damaged? 2. Replace Is input voltage f ollow below table? Main PCB.
  • Page 41 Reconnect Replace Is the connector properly Is the resistance of def rost sensor def rost connected? f ollow below table? sensor Replace Fuse-M Defrost Is the resistance of Fuse-M less Sensor than 0.2Ω? Fuse-M Explain to customer Such error message may be displayed when the gasket contact of the door is poor, or if too much hot f ood is inserted into the ref rigerator.
  • Page 42 8-8. Refrigerator Fan Error (E rF) Symptom Check Point 1. E rF 1. Check the air f low 2. Check the PCB Fan motor voltage Duct CON7 CON201 CON6 CON6 CON3 CON2 CON1 CON5...
  • Page 43 Refrigerator Fan Error (Er rF) Reset the unit and Replace Input Test1 Mode. Check the Fan Motor voltage Main PCB (Push the button 1 time) Is Fan Motor voltage 11.4~12.6 V? Go to 3 Open the freezer door and Check the air flow.
  • Page 44 8-9. Freezer Fan Error (E FF) Symptom Check Point 1. E FF 1. Check the air f low 2. Check the Fan Motor 2. Check the PCB Fan motor voltage Fan Motor CON7 CON201 CON6 CON7 CON3 CON2 CON1 CON5 TEST MODE 1 Voltage [V] CON7...
  • Page 45 Freezer Fan Error (Er FF) Reset the unit and Replace Input Test1 Mode. Check the Fan Motor voltage Main PCB (Push the button 1 time) Is Fan Motor voltage 11.4~12.6 V? Go to 3 Open the freezer door and Check the air flow.
  • Page 46 8-10. Icing Fan Error (E IF) Symptom Check Point 1. E IF 1. Check the air f low 2. Check the Connector 2. Check the PCB Fan motor voltage Air Flow Connector CON7 CON201 CON7 CON6 CON3 CON2 CON1 CON5 TEST MODE 1 Voltage [V] CON7...
  • Page 47 Freezer Fan Error (Er IF) Reset the unit and Input Test1 Mode. Replace (Push the button 1 time) Check the Fan Motor voltage Main PCB Is Fan Motor voltage 11.4~12.6 V? Go to 3 Open the freezer door and Check the air flow.
  • Page 48 8-11. Condenser Fan Error (E CF) Symptom Check Point 1. E CF 1. Check the air f low 2. Check the Connector 2. Check the PCB Fan motor voltage Fan Motor CON7 CON201 CON6 CON7 CON3 CON2 CON1 CON5 TEST MODE 1 Voltage [V] CON7 11.4~12.6V...
  • Page 49 Condenser Fan Error (Er CF) Reset the unit and Input Test1 Mode. Replace (Push the button 1 time) Check the Fan Motor voltage Main PCB Is Fan Motor voltage 11.4~12.6 V? Go to 3 Check the fan rotating. Does fan rotate? Change the Check the Fan Motor voltage motor...
  • Page 50 8-12. Communication Error (E CO) Symptom Check Point 1. E CO 1. Check the loose connection 2. Check the Hinge connection CON7 CON201 CON6 CON5 CON3 CON101 CON2 CON1 CON5 Voltage [V] CON101 11.4~12.6V pin& 2 CON101 Not 0V, 5V pin&...
  • Page 51 Communication Error (E CO) Change the Main PCB Check the voltage. Is CON101 2 pin & 4 voltage 0V or 5V? Check the loose connection Voltage CON101 CON101 pin & 4 0V, 5V Check the Check the voltage. Hinge (loose Is CON101 1 pin &...
  • Page 52 8-13. Cube mode doesn’t work Symptom Check Point 1. Cube mode 1. Check the loose connection doesn’t work 2. Check the resistance CON1 CON2 Ice Maker Geared Motor Dispenser Motor...
  • Page 53 LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V Geared Motor 31.1 ~ 42.1 CON2 pin & Dispenser Motor 9.9 ~ 12.1 0~2V B(NEUTRAL) Pushing Pushing 9~12V CON1 pin & 0~2V Pushing...
  • Page 54 Cube mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 31.1 ~ 42.1Ω? Check the loose connection Geared Motor Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 31.1 ~ 42.1 CON2 Replace...
  • Page 55 8-14. Crush mode doesn’t work Symptom Check Point 1. Crush mode 1. Check the loose connection doesn’t work 2. Check the resistance CON1 CON2 Ice Maker Geared Motor Dispenser Motor...
  • Page 56 LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V Geared Motor 31.1 ~ 42.1 CON2 pin & Dispenser Motor 9.9 ~ 12.1 0~2V B(NEUTRAL) Pushing Pushing 9~12V CON1 pin & 0~2V Pushing...
  • Page 57 Crush mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 31.1 ~ 42.1Ω? Check the loose connection Geared Motor Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Resistance [Ω] Geared Motor 31.1 ~ 42.1 CON2 Replace...
  • Page 58 8-15. Water mode doesn’t work Symptom Check Point 1. Water mode 1. Check the loose connection doesn’t work 2. Check the resistance valve CON2 Water Valve Pilot Valve CON2 Voltage [V] LEVER S/W Pushing 112~115V CON2 pin & 0~2V B(NEUTRAL) Pushing Pushing 112~115V...
  • Page 59 Water mode doesn't work Replace Check the loose connection Check the resistance value. P/ Valve Is Pilot Valve resistance 360~420Ω? Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Pilot Valve Resistance [Ω] Pilot Valve 360~420 CON2 LEVER S/W Voltage [V]...
  • Page 60 8-16. Freezer room lamp doesn’t work Symptom Check Point 1. Freezer room lamp 1. Check the f reezer door switch doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp LED Lamp CON7 LED Lamp CON201 CON6 CON3 CON2 CON1...
  • Page 61 Freezer room lamp doesn’t work Explain to Change the The Switch senses if the door is open Check the LED Lamp voltage customer LED Lamp or close. Is voltage 11.4 ~ 12.6V? When the door open, lamp On LED Lamp When the door Close, lamp Off LED Lamp Change the...
  • Page 62 8-17. Refrigerator room lamp doesn’t work Symptom Check Point 1. Ref rigerator room 1. Check the door S/W resistance lamp doesn’t work 2. Check the LED Lamp CON7 CON201 CON6 LED Lamp CON3 CON2 CON1 CON5 CON6 LED Lamp Door S/W Resistance [Ω] Normal Door S/W...
  • Page 63 Refrigerator room lamp doesn’t work Explain to Change the The Switch senses if the door is Check the LED Lamp voltage customer LED Lamp open or close. Is voltage 11.4 ~ 12.6 V? When the door open, lamp On When the door Close, lamp Off LED Lamp Change the Check the door S/W resistance.
  • Page 64 8-18. Poor cooling in Fresh food section Symptom Check Point 1. Poor cooling in Fresh 1. Check the sensor resistance f ood section 2. Check the air f low 3. Check the air Temperature 4. Check the R-Fan motor voltage CON7 CON201 Duct...
  • Page 65 Poor cooling in Fresh food section Check the Compressor Check the air temperature. and sealed Is it cold? system Check the sensor resistance. CON7 Go to 8 Replace Main PCB Check the Fan Motor voltage Is Fan Motor voltage 11.4~12.6 V? 2 Reset the unit and Change the Input Test1 Mode.
  • Page 66 8-19. Poor cooling in Fresh food section Symptom Check Point 1. Poor cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air f low 3. Check the air Temperature 4.Check the Fan motor sticky 4. Check the Fan motor voltage CON7 CON201 Duct...
  • Page 67 Poor cooling in Freezer compartment Check the Compressor Check the air temperature. and sealed Is it cold? system Check the sensor resistance. Change the Fan motor Check the Fan motor. Rotate fan using hand. It feel sticky? Fan Motor 2 Reset the unit and Input Test1 Mode.
  • Page 68 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage 11.4~12.6 V? Change the Check the Fan Motor voltage motor Is Fan Feed Back voltage 0V, 5V? Replace Check the Fan Motor voltage Main PCB Is Fan PWM voltage 0V, 5V? Explain to customer...

  • Page 69: Reference

    9. Reference 9-1 TEST MODE and Removing TPA 1. How to make TEST MODE If you push the test button on the Main PCB, the refrigerator will be enter the TEST MODE. * 1 time : Comp / Damper / All FAN on (All things displayed) Refrigerator Freezer...
  • Page 70 9-2 TEMPERATRUE CHART - FREEZER AND ICING SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 73.29 kΩ 4.09 V -30°F (-35°C) 53.63 kΩ 3.84 V -30°F (-21°C) 39.66 kΩ 3.55 V 29.62 kΩ -13°F (-25°C) 3.23 V 22.33 kΩ -4°F (-20°C) 2.89 V 16.99 kΩ...
  • Page 71 9-3 TEMPERATRUE CHART - REFRIGERATOR AND DEFROST SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 225.1 kΩ 4.48 V 169.8 kΩ -30°F (-35°C) 4.33 V 129.3 kΩ -30°F (-21°C) 4.16 V 99.30 kΩ -13°F (-25°C) 3.95 V 76.96 kΩ -4°F (-20°C) 3.734 V 60.13 kΩ...
  • Page 72 9-4 How to check the Fan-Error After sending a signal to the fan, the MICOM checks the BLDC fan motor s lock status. If there is no feedback signal from the BLDC fan, the fan motor stops for 10 seconds and then is powered again for 15 seconds.

  • Page 73: Component Testing Information

    10. COMPONENT TESTING INFORMATION 10-1 Defrost Controller Assembly Function The controller assembly is made up of two different kinds of parts. The fuse and the sensor. To determine if these parts are defective, check for resistance. The fuse will cut power to the defrost heater at very high temperatures.
  • Page 74 10-2 Sheath Heater (Freezer Room) Function Sheath heater is the part for defrost. All heating wire is connected to only one line. So we can decide part is defective or not when we check the resistance. How to Measure Set a ohmmeter connect to The housing pins. Measure the pins connected to Sheath Heater.
  • Page 75 10-3 L-cord Heater (Freezer Room) Function L-cord Heater is the part for defrost. All heating wire is connected to only one line. So we can decide part is defective or not when we check the resistance. How to Measure Set a ohmmeter connect to The housing pins. Measure the pins connected to Sheath Heater.
  • Page 76 10-4 Sheath Heater (Refrigerator Room) Function Sheath heater is the part for defrost. All heating wire is connected to only one line. So we can decide part is defective or not when we check the resistance. How to Measure Set a ohmmeter connect to The housing pins. Measure the pins connected to Sheath Heater.
  • Page 77 10-5 Door Switch 10-5-1 Door Switch,R Check Voltage between pin 13 and 14 disconnection CON5 1.Check Reed S/W 2.Check Harness disconnection 3.If No.1,2 ok ,change PCB Check the Reed S/W resistance -.No Magnet Magnet Center Magnet Center Switch Center Switch Center Good position Bad position -.Magnet Near the Switch...
  • Page 78 Push Hook Push Hook Push second Push first - 78 -...
  • Page 79 10-5-2 Door Switch,F The Switch senses if the door is open or close. .When the door open, lamp On .When the door Close, lamp Off close Door and check the lamp Through the gap Check Voltage between pin 21 and 22 disconnection CON7 1.Check Reed S/W...
  • Page 80 Push First push Second push - 80 -...
  • Page 81 10-6 Dispenser DC Motor Function - Dispenser DC Motor : When customer push the dispenser button, Pull duct door How to Measure Dispensor DC Motor Standard Dispenser DC Motor Test Points Result 9.9 ~ 12.1 Ω (1) to (2) - 81 -...
  • Page 82 10-7 AC Motor ASSEMBLY Function The motor in the door pushed the ice into the dispenser. How to < In-door Motor > < In-door Motor > Measure Separate the Separate the housing. housing. Measure the Measure the resistance between resistance between (1) and (2) (1) and (3) Check the resistance between connectors (In-door motor 1, 2) and...
  • Page 83 10-8 Damper Function The damper supplies cold air from the freezer to the chill room using the damper plate. The chill room is colder when the damper plate is open. When the damper is closed the chill rooms temperature will rise. How to Measure <...
  • Page 84 10-9 Flow Sensor Function Flow Sensor (in machine room) Count the water quantity from city water to water filter in refrigerator How to Measure Flow Sensor (in machine room) Standard Test Points Result 4 ~ 30 k Ω Red wire to Black wire - 84 -...

  • Page 85: Compressor Troubleshooting

    11. Compressor Troubleshooting Test Mode Comp Ref. Display & sound Refer FLD090LANA(A-Inverter) TEST1 Forced Starting TDC (Full Stroke) Display ON, Buzz 1 time Troubleshooting LED blinks LED blinks Reset Replace 8 times 8 times the PCB - Simple Check Sequence ※...
  • Page 86 11-1 Check A - There is PC Board located in the PCB case. The control driver is PC board for the compressor. - This step shows the source voltage of the driver PC board. Step1. Open PCB Cover Step2. Check Driver PCB LED Lamp * Driver PCB located in machine room.
  • Page 87 11-2 Check B Measures depending on the trip and the number of LED blinks Protection Logic B1. LED blinks once with FCT0 trip (FCT0 fault). Blink OFF Blink OFF Purpose: To determine failure in motor voltage and current detection When the compressor connection is unstable (approx. for 25 - 28 seconds after the power is turned on), check the voltage values of point A (motor voltage), point B (motor voltage) and Point C (motor current).
  • Page 88 Measures depending on the trip and the number of LED blinks Protection Logic B3. LED blinks 6 times with current strip (current trip). Blink Blink Blink Blink Blink Blink Purpose: To prevent overcurrent (overload prevention) Cause: Abnormal environmental conditions such as high ambient temperature (43 or above) or machine room shielding, failure in condenser fan, compressor, or PCB (damaged IPM element), lack of the oil in the cylinder, defective cylinder or piston, outlet clogging, or foreign substance inside compressor...
  • Page 89 Measures depending on the trip and the number of LED blinks Protection Logic B4. LED blinks 7 times with IPM fault trip (IPM fault). Blink Blink Blink Blink Blink Blink Blink Purpose: To prevent over-current due to IPM short-circuit or failure Cause: IPM short-circuit or failure Multi Logic: Restart every 20 seconds after the compressor is turned off.
  • Page 90 11-3 Check C Checking Compressor and Harness Check Process 1. Check the harness connection Step 1. Power off 2. Check the compressor. Step 2. Check the resistance (point A). Step 3. Check the harness (INF ohm). Step 4. Check the resistance (point B). Step 5.
  • Page 91 11-4 Check D D1. Activate Protection logic Cycle check with protection logic - We have to check Condenser fan and Freezer fan before performing Check D - Current trip and stroke trip can be activated by other problems then the driver or compressor. → When process line on compressor is opened, and refrigerant is not expelled High Pressure because it has accumulated in condenser.
  • Page 92 Compressor Troubleshooting WARNING HIGH VOLTAGE Step 1) Open PCB cover Step 2) Check for blinking frequency of LED and PCB LED Lamp When compressor is normal, it does not blink : Refer to the next page to find out what actions to take according to how many times LED blink - 92 -...
  • Page 93 LED operating condition Cause Service guideline 1. Please check, Whether connector of compressor is attached PCB Parts rightly or not. after defect or LED two - time repetiton (Stroke Trip) power off Compressor 2. After the first action, Connector You check on normal miss operation of ·...
  • Page 94 11-5 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY No Cooling. • Is the power cord unplugged from the outlet? • Plug into the outlet. • Check if the power switch is set to OFF. • Set the switch to ON. •...
  • Page 95 11-6 REFRIGERATION CYCLE Troubleshooting Chart ▼ TEMPERATURE STATE OF STATE OF THE OF THE CAUSE REMARKS THE UNIT EVAPORATOR COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher than • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard ambient to a leak.
  • Page 96 11-6-2 SEALED SYSTEM DIAGNOSIS “Not Cooling” Complaint All components operating, No airflow problems, Not frosted up as a defrost problem problem has been isolated to sealed system area Frost Partial None Pattern? Equalization Equalization Test Test Very Fast Very Slow Very Slow Very Fast Fast...

  • Page 97: Icemaker Operating Method And Trouble Shooting

    12. ICEMAKER OPERATING METHOD AND TROUBLE SHOOTING 12-1 Icemaker’s Basic Operating Method Power On Power On • Adjusts EJECTOR to Start Position with power on. Start Position Icemaking • Walls until water becomes cold after starting the Mode icemaking operation. Full Ice •...

  • Page 98: Desciption Of Function & Circuit Of Micom

    12-2 Trouble Shooting Ice & Water system Issues 12-2-1 Icemaker not making ice or not making enough ice (Environmental Diagnosis) ▶Icemaker can’t make ices itself. Basically, water, temperature and time are needed. - Water : If no Water, then no Ice. - Temperature : The compartment, where the icemaker is located, has to be at least 1°F so that icemaker dumps ices to the bin.
  • Page 99 13. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM - 99 - - 99 -...
  • Page 100 - 100 - - 100 -...
  • Page 101 13-1-9 CONTROL OF FREEZER FAN MOTOR 1. Freezer fan motor has high and standar speed. 2. When refrigerator is overloaded, fan motor runs in high speed as powered-up Standard speeds is used for general purposes. 3. To improve cooling speed, the RPM of freezer fan motor changs from normal speed to high. 13-1-10 Cooling Fan Motor 1.
  • Page 102 13-1-14 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time Betwee 7~50 hours. 2. Defrosting stops if the sensor temperature reaches 41°F(5°C) or more. If the sensor doesn’t reach 41°F(5°C) in 1 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function) 3.
  • Page 103 15. EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION : Use the part number to order part, not the position number. 405J 603C 603E 626A 624E 207B 158C 624G 402A 624C 500P 503D 409D 158A 103B 610F 271B 409F 103A 282G 282H...
  • Page 104 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 145G 145C 145I 145K 131A 249M 136C 136B 249L 145F 133C 145M 132Q 136E 145J 133C 134A 205D 145H 132P 150B 150D 237C 150C 136A 253D...
  • Page 105 REFRIGERATOR PARTS CAUTION: Use the part number to order part, not the position number. 141H 142B 141A 143A 142A 142D 141B 141F 141H 141H 141A 141A 141B 141B 141F 141F 255B 255A 154D 255A 177C 132P 132P 133E 161B 133E 151B 161C 161A...
  • Page 106 DOOR PARTS CAUTION: Use the part number to order part, not the position number. 205F 500C 180A 241A 241C 231B 233B 233A 231A 241K 212G 235A 241B 241K 241E 241K 241E 312B 205E 243D 243C 262C 243A 262C 244A 244A 624A 405M 262E...
  • Page 107 DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 276A 276G 276F 276I 405A 276B 275A 278C 279A 278D 279K 402C 279L 501D 279B 281A 501A 279C...
  • Page 108 VALVE & WATER TUBE PARTS CAUTION: Use the part number to order part, not the position number. 617A 625A 616G 616G 623B 616J 623B 616J 603C 627B 627A 619A...
  • Page 109 ICE MAKER & ICE BIN PARTS CAUTION: Use the part number to order part, not the position number. 630J 630J 600B 600F 600I 600G 630F 600H 630B 630C 611A 607A 600A 630A 630H 630D 630E 630Q 630G...
  • Page 110 P/No. MFL68488629 SEP., 2017 Printed in Korea...

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