LG LMXS27626S Service Manual
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LG LMXS27626S Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODEL : LMXS27626*
COLOR : STAINLESS(ST)
SMOOTH BLACK(SB)
SUPER WHITE(SW)

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Summary of Contents for LG LMXS27626S

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. COLOR : STAINLESS(ST) SMOOTH BLACK(SB) SUPER WHITE(SW) MODEL : LMXS27626*...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS ................................3 2. PARTS IDENTIFICATION ..............................4-5 3. DISASSEMBLY ................................6-18 REMOVING AND REPLACING REFRIGERATOR DOORS .....................6 DOOR ....................................7 DOOR ALIGNMENT ................................8 FAN AND FAN MOTOR(EVAPORATOR) ......................... 8 DEFROST CONTROL ASSEMBLY ........................... 8 LAMP ....................................

  • Page 3: Specifications

    1. SPECIFICATIONS 1-1 LMXS27626* 27 cu.ft. ● ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Clear Drawer Type DIMENSIONS (inches) 3 /4 X 35 3 /8 X 69 3 /4 (WXDXH) 27cu.ft. COMPRESSOR Linear NET WEIGHT (pounds) 165 kg. (364 lb) EVAPORATOR Fin Tube Type COOLING SYSTEM...
  • Page 4 - 4 -...
  • Page 5 Top Drawer Bottom Drawer - 5 -...

  • Page 6: Parts Identification

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS ................................3 2. PARTS IDENTIFICATION ..............................4-5 3. DISASSEMBLY ................................6-18 REMOVING AND REPLACING REFRIGERATOR DOORS .....................6 DOOR ....................................7 DOOR ALIGNMENT ................................8 FAN AND FAN MOTOR(EVAPORATOR) ......................... 8 DEFROST CONTROL ASSEMBLY ........................... 8 LAMP ....................................

  • Page 7: Door

    3-2 DOOR ● Door Gasket Replacement 1. Insert gasket into channel ● Mullion Removal Press gasket into channels on the four remaining 1. Remove 2 screws. sides of door. 2. Lift Mullion up carefully. ● Mullion Replacement 1. Connect wire harness. 3.

  • Page 8: Door Alignment

    3-3 Door Alignment * Ice Fan Scroll Assembly Replacement If the space between the door are uneven, 1) Remove the plastic guide on the left side, using a follow the instructions to align them. phillips screwdriver to remove the screws. Remove the Base Grillie.

  • Page 9: Lamp

    3-6 LAMP 3-7 MULTI DUCT Unplug, or disconnect power at the circuit breaker. 1. Romove the upper and If necessary, remove top shelf or shelves. lower caps with a flat screwdriver and remove 2 screws. 3-6-1 Refrigerator Compartment Lamp (Figure 3) 1) Release 2 screws.

  • Page 10: Dispenser

    3-8 MAIN PWB 1) Loosen 3 screws on the PWB cover. 5) Remove the 4) Holding the inner side of lead wire. the dispenser pull forward to remove. CAUTION: When replacing the dispenser cover make 2) Remove the PWB cover sure the lead wire does NOT come off and the water line is not pinched by the dispenser.

  • Page 11: Water Button Assmebly

    3-12 WATER BUTTON ASSMEBLY 3-14 ICEMAKER REPLACEMENT 1) Remove screws. 1) Remove 4 screws as shown. 2) Grasp the Button assembly and lift. Button Lever 2) Grasp the bottom of motor cover assembly and pull slowly. 3-13 ICE CORNER DOOR REPLACEMENT 1) Loosen the front screw as shown in the picture.

  • Page 12: Sub Pwb For Working Dispenser

    CAUTION: Make sure that the motor housing is taped to 3-16 CAP DUCT MOTOR REPLACEMENT the mold, if not positioned correctly the cover will not fit 1) Separate the Housing of the Cap Duct Motor. properly. 2) Unscrew 3 screws to disassemble the motor. 3) When replacing the motor, check the position of the door 3-15 SUB PWB FOR WORKING DISPENSER duct and the link for proper fit.
  • Page 13 3-17 HOW TO REMOVE A ICE BIN 3-18 HOW TO INSERT A ICE BIN 1) Grip the handles, as shown. 1) Insert the Ice Bin, slightly tilting to avoid touching the Icemaker. (Especially, Ice-Detecting Sensor) 2) Tilt and lift slightly as shown. 3) Remove ice bin slowly.

  • Page 14: 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 top drawer Step 4) Removal of the freezer door is done by lifting clear Step 3) Remove the two screws from the guide rails (one of the rail support.
  • Page 15 3-19-2 Follow Steps to Reinstall Step 1) Insert both side of supporter cover tv into connector rails, and then screw them. Step 2) ① Assemble a bar and gear ice with screw. ② Push the otherside of the gear to inside of the bar. Step 3) Put gear ice assembled with the bar by screw into connector rail’s hole.
  • Page 16 Step 5) The rail system will align itself by pushing the rails all the way into the freezer section. Pull the rails back out to full extension. Step 6) Reinstall the freezer door by inserting the rail tabs into the guide rail. * Assemble them like as pictures Step 7) Reinstall the two screws into the guide rails Step 8) Reinstall the top drawer, and close the freezer...

  • Page 17: 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 Figure 63 Figure 59...

  • Page 18: Top Drawer

    3-22 TOP DRAWER To remove the freezer drawer, pull the drawer open to full extension. Remove the drawer and Ice Bin lifting the basket from To remove the freezer drawer, pull the drawer open to full extension. Remove the drawer and Ice Bin lifting the basket from the rail system.

  • Page 19: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 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 20: Circuit Diagram

    5. CIRCUIT DIAGRAM...

  • Page 21: Troubleshooting

    6. TROUBLESHOOTING 6-1 Error Code Summary WARNING: When checking Resistance values, make sure to turn off the power, and wait for the voltage to discharge. NOTE) Within 3 hours after the error : Press the Ice Plus button and Freezer button simultaneously 3 hours after the error : All errors, except for "E rt", "E SS", "E IS(except for Icing sensor)", "E gF", "E It"...

  • Page 22: Pcb Picture

    7. PCB Picture 7-1. Main PCB ( P/N : EBR747964**) CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 7-2. Display PCB ( P/N : EBR786319**) CON101 CON102 CON103CON105 - 22 -...
  • Page 23 7. PCB Picture 7-3. Sub PCB ( P/N : EBR60070711/33) - 23 -...

  • Page 24: Trouble Shooting

    8. Trouble Shooting 8-1. Freezer Sensor Error (E FS) Symptom Check Point 1. E FS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 pin ~ 16 Open Other Normal...
  • Page 25 Freezer Sensor Error (E FS) Reconnect or Is the Connector disconnected repair the Check the Sensor resistance. or loose between Main PCB and connector Is resistance normal? sensor? Check the Temperature and resistance refer to the table. No problem? CON7 CON7 pin ~ 16 Resistance [Ω]...
  • Page 26 8-2. Refrigerator Sensor Error (E rS) Symptom Check Point 1. E rS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 pin ~ 14 Open Other Normal CON7 pin ~ 14 Resistance [Ω]...
  • Page 27 Refrigerator Sensor Error (E rS) Reconnect or Is the Connector disconnected repair the Check the Sensor resistance. or loose between Main PCB and connector Is resistance normal? sensor? Check the Temperature and resistance refer to the table. No problem? CON7 CON7 pin ~ 14 Resistance [Ω]...
  • Page 28 8-3. Icing Sensor Error (E IS) Symptom Check Point 1. E IS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] CON5 Short pin ~ 17 Open Other Normal CON5 pin ~ 17 Resistance [Ω]...
  • Page 29 Icing Sensor Error (E IS) Reconnect or Is the Connector disconnected repair the Check the Sensor resistance. or loose between Main PCB and connector Is resistance normal? sensor? Check the Temperature and resistance refer to the table. No problem? CON5 CON5 pin ~ 17 Resistance [Ω]...
  • Page 30 8-4. Defrost Sensor Error (F dS) Symptom Check Point 1. F dS 1. Check for a loose connection 2. Check Sensor Resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance [Ω] Short CON7 pin ~ 18 Open Other Normal CON7 pin ~ 18 Resistance [Ω]...
  • Page 31 Defrost Sensor Error (F dS) Reconnect or Is the Connector disconnected repair the Check the Sensor resistance. or loose between Main PCB, connector Is resistance normal? Defrost controller and Sensor? Check the Temperature and resistance refer to the table. No problem? CON7 CON7 pin ~ 18...
  • Page 32 8-5. Ice Maker Motor Error (E It) Symptom Check Point 1. E It 1. Check the Ice maker rotation 2. Check the motor voltage CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 - 32 -...
  • Page 33 Ice Maker Motor Error (E It) Change the Explain to Main PCB Input Ice Maker test mode(Push customer Check the ice maker forward status The ice maker test button),check The voltage (1)~(2) point 0V? The Ice Tray,Ice maker motor Rotate? Change the Check the ice maker reverse status Main PCB...
  • Page 34 8-6. Defrost Heater Error (F dH) Symptom Check Point 1. F dH 1. Check the door gasket 2. Check the Defrost control part 3. Check the PCB output voltage CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Resistance Part [Ω] FUSE-M Defrost Heater 34~42...
  • Page 35 Defrost Heater Error (F dH) Input Test 3 Mode Replace the Replace (Push the button 3 times) Check the Door gasket . Door gasket Main PCB Check the Heater Voltage. Is door gasket damaged? Is voltage 112~116V? CON3 Change TEST MODE 3 Voltage [V] Defrost Check the Defrost control part.
  • Page 36 8-7. Freezer Fan Error (E FF) Symptom Check Point 1. E FF 1. Check the air flow 2. Check the Fan Motor 3. Check the PCB Fan motor voltage CON2 CON3 Fan Motor CON5 CON1 CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 pin ~ 12...
  • Page 37 Freezer Fan Error (E FF) Reset the unit and Replace Input Test1 Mode. Main PCB Check the Fan Motor voltage (Push the button 1 time) Is Fan Motor voltage 8~12V? CON7 TEST MODE 1 Voltage [V] Go to 3 Open the freezer door and Check CON7 the air flow.
  • Page 38 8-8. Icing Fan Error (E IF) Symptom Check Point 1. E IF 1. Check the air flow 2. Check the Connector 3. Check the PCB Fan motor voltage CON2 CON3 CON5 CON1 Fan Motor CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 8~12V...
  • Page 39 Freezer Fan Error (E IF) Reset the unit and Replace Input Test1 Mode. Main PCB Check the Fan Motor voltage (Push the button 1 time) Is Fan Motor voltage 8~12V? CON7 TEST MODE 1 Voltage [V] Go to 3 Open the freezer door and Check CON7 the air flow.
  • Page 40 8-9. Icing Fan Error (E rF) Symptom Check Point 1. E rF 1. Check the air flow 2. Check the Connector 3. Check the PCB Fan motor voltage CON2 CON3 CON5 CON1 Fan Motor CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON6 8~12V...
  • Page 41 Freezer Fan Error (E rF) Reset the unit and Replace Input Test1 Mode. Main PCB Check the Fan Motor voltage (Push the button 1 time) Is Fan Motor voltage 8~12V? CON6 TEST MODE 1 Voltage [V] Go to 3 Open the freezer door and Check CON6 the air flow.
  • Page 42 8-10. Condenser Fan Error (E CF) Symptom Check Point 1. E CF 1. Check the air flow 2. Check the Connector 3. Check the PCB Fan motor voltage CON2 CON3 Fan Motor CON5 CON1 CON6 CON201 CON7 CON4 TEST MODE 1 Voltage [V] CON7 8~12V...
  • Page 43 Condenser Fan Error (E CF) Reset the unit and Replace Input Test1 Mode. Check the Fan Motor voltage Main PCB (Push the button 1 time) Is Fan Motor voltage 8~12V? CON7 TEST MODE 1 Voltage [V] Go to 3 Check the fan rotating. CON7 Does fan rotate? 8~12V...
  • Page 44 8-11. Communication Error (E CO) Symptom Check Point 1. E CO 1. Check the loose connection 2. Check the Hinge connection CON2 CON3 CON5 CON1 CON5 CON6 CON201 CON7 Display CON4 CON101 Voltage [V] CON101 pin ~ 6 CON101 Not 0V, 5V pin ~ 5 CON101 Not 0V, 5V...
  • Page 45 Communication Error (E CO) Change the Main PCB Check the voltage. Is CON101 5 pin ~ 3 voltage 0V or 5V? Check the loose connection Voltage Housing CON101 pin ~ 3 0V, 5V Check the Hinge (loose Check the voltage. connection) Is CON101 5 pin ~ 6...
  • Page 46 8-12. Cube mode doesn’t work Symptom Check Point 1. Cube mode 1. Check the loose connection doesn’t work 2. Check the resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 CON1 CON2 (BK) (WH) Ice Maker Geared Motor Dispenser Motor - 46 -...
  • Page 47 8-12. Cube mode doesn’t work LEVER S/W Voltage [V] Resistance [Ω] CON2 Pushing 112~115V Geared Motor 31.1 ~ 42.1 pin ~ 12 0~2V Dispenser Motor Pushing 9.9 ~ 12.1 Pushing 9~12V CON3 5 pin ~ CON1 13 0~2V Pushing - 47 -...
  • Page 48 Cube mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 144~ 176Ω? Check the loose connection Check the voltage. Change the (while pushing the lever S/W) Geared Motor Is voltage correct? Resistance [Ω] CON2 Geared Motor 31.1 ~ 42.1 (BK) (WH)
  • Page 49 8-13. Crush mode doesn’t work Symptom Check Point 1. Crush mode 1. Check the loose connection doesn’t work 2. Check the resistance CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 CON1 CON2 (SB) (WH) Ice Maker Geared Motor Dispenser Motor - 49 -...
  • Page 50 8-13. Crush mode doesn’t work LEVER S/W Voltage [V] Resistance [Ω] Pushing 112~115V CON2 Geared Motor 31.1 ~ 42.1 pin ~ 4 0~2V Dispenser Motor Pushing 9.9 ~ 12.1 Pushing 9~12V CON3 5 pin ~ CON1 13 0~2V Pushing - 50 -...
  • Page 51 Crush mode doesn't work Replace Geared Motor Check the resistance value. Is Geared Motor resistance 87 ~ 107Ω? Check the loose connection Check the voltage. Change the (while pushing the lever S/W) Geared Motor Is voltage correct? Resistance [Ω] CON2 Geared Motor 31.1 ~ 42.1 (SB)
  • Page 52 8-14. Water mode doesn’t work Symptom Check Point 1. Water mode 1. Check the loose connection doesn’t work 2. Check the resistance valve (PR) (BL) CON2 LEVER S/W Voltage [V] CON2 Pushing 112~115V pin ~11 0~2V Pushing Resistance [Ω] Pilot Valve 360~420 Water valve 360~420...
  • Page 53 Water mode doesn't work Replace Check the loose connection Water Valve Check the resistance value. Is Water Valve resistance 360~420 Ω? Change the Check the voltage. (while pushing the lever S/W) Is voltage correct? Water Valve Resistance [Ω] CON2 Water valve 360~420 LEVER S/W Voltage [V]...
  • Page 54 8-15. Refrigerator room lamp doesn’t work Symptom Check Point 1. Refrigerator room 1. Check the Refrigerator door switch sticky lamp doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp CON2 CON3 CON5 CON1 CON6 CON201 CON7 CON4 Door S/W CON6...
  • Page 55 Refrigerator room lamp doesn’t work Change the Check the LED Lamp voltage. Change the Check the Refrigerator door switch. Is it 0~2V? (While door closed) Door S/W Door S/W Does it feel sticky? Change the Check the door S/W resistance. Door S/W 5 Check the LED Lamp voltage.
  • Page 56 8-16. Freezer room lamp doesn’t work Symptom Check Point 1. Freezer room lamp 1. Check the Freezer door switch sticky doesn’t work 2. Check the door S/W resistance 3. Check the LED Lamp CON2 CON3 CON5 CON1 CON6 CON201 F room LED PCB CON4 Door S/W CON6...
  • Page 57 Freezer room lamp doesn’t work Change the Change the Check the Freezer door switch. LED Lamp Door S/W Check the LED Lamp voltage Does it feel sticky? Is voltage 12V? (While door open) Change the Check the door S/W resistance. Door S/W Is it correct compared with table? Explain to customer...
  • Page 58 8-17. Poor cooling in Fresh food section Symptom Check Point 1. Poor cooling in 1. Check the sensor resistance Fresh food section 2. Check the air flow 3. Check the air Temperature 4. Check the R-Damper motor voltage CON2 CON3 Duct CON5 CON1...
  • Page 59 Poor cooling in Fresh food section Check the Compressor Check the air temperature. and sealed Is it cold? system Check the sensor resistance. Go to 7 Check the Fan Motor voltage Replace CON7 Is Fan Motor voltage 8~12V? Main PCB pin ~ 14 Resistance [Ω] 23ºF / -5ºC...
  • Page 60 8-18. Poor cooling in Freezer compartment Symptom Check Point 1. Poor cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air flow 3. Check the air Temperature 4.Check the Fan motor sticky 5. Check the Fan motor voltage CON2 CON3 Duct CON5...
  • Page 61 Poor cooling in Freezer compartment Check the Compressor Check the air temperature. and sealed Is it cold? system Check the sensor resistance. CON7 Change the CON7 Fan motor Check the Fan motor. pin ~ 16 Resistance [Ω] Rotate fan using hand. It feel sticky? -22ºF / -30ºC Fan Motor...
  • Page 62 Replace Check the Fan Motor voltage Main PCB Is Fan Motor voltage 8~12V? TEST MODE 1 Voltage [V] CON7 pin ~ 12 8~12V Change the motor Check the Fan Motor voltage Is Fan Feed Back voltage 1~5V? TEST MODE 1 Voltage [V] CON7 Not 0V, 5V...
  • Page 63 8-19. Over cooling in Freezer compartment Symptom Check Point 1. Over cooling in 1. Check the sensor resistance Freezer compartment 2. Check the air flow 3. Check the air Temperature 4.Check the Fan motor sticky 5. Check the Fan motor voltage CON2 CON3 Duct CON5...
  • Page 64 Over cooling in Freezer compartment Change the Fan motor Check the Fan motor. Rotate fan using hand. Check the sensor resistance. It feel sticky? Fan Motor CON7 CON7 pin ~ 16 Resistance [Ω] -22ºF / -30ºC -13ºF / -25ºC Change the Main PCB -4ºF / -20ºC -13ºF / -25ºC 14ºF / -10ºC...
  • Page 65 8-20. Hygiene fan doesn’t work Symptom Check Point 1. Hygiene fan 1. Check Hygiene Fan motor voltage 2. Main PCB doesn’t work CON2 CON3 CON5 CON1 CON6 CON201 Hygiene Fan motor CON4 CON6 Voltage [V] CON6 pin ~ 6 - 65 -...
  • Page 66 Hygiene fan doesn’t work Change the Change the Fan motor Check the Hygiene voltage Choose the Hygiene Max in display Is voltage 12V? (While door open) Check the PCB Voltage. Is CON6 2 pin ~ 6 voltage 12V? Voltage [V] CON6 pin ~ 6 Explain to customer...
  • Page 67 8-21. Hygiene LED doesn’t work Symptom Check Point 1. Hygiene LED 1. Check Hygiene LED voltage 2. Main PCB doesn’t work CON2 CON3 CON5 CON1 CON6 CON201 Hygiene LED CON4 CON6 Voltage [V] CON6 pin ~ 6 - 67 -...
  • Page 68 Hygiene LED doesn’t work Change the Change the Fan motor Check the Hygiene LED voltage Choose the Hygiene Max in display Is voltage 12V? (While door open) Check the PCB Voltage. Is CON6 4 pin ~ 6 voltage 12V? Voltage [V] CON6 pin ~ 6 Explain to customer...

  • Page 69: Reference

    . Reference 9-1 TEST MODE and Removing TPA 1. How to enter the TEST MODE Push the test button on the Main PCB to enter the TEST MODE. * 1 time : Comp / Damper / All FAN on * 2 times : Damper closed (22 22 displayed) * 3 times : Forced defrost mode Main PWB...
  • Page 70 9-2 TEMPERATRUE CHART - FRZ AND ICING SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 73.29 ㏀ 4.09 V -30°F (-35°C) 53.63 ㏀ 3.84 V -21°F (-30°C) 39.66 ㏀ 3.55 V -13°F (-25°C) 29.62 ㏀ 3.23 V -4°F (-20°C) 22.33 ㏀ 2.89 V 5°F (-15°C) 16.99 ㏀...
  • Page 71 9-3 TEMPERATRUE CHART - REF AND DEF SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 225.1 ㏀ 4.48 V -30°F (-35°C) 169.8 ㏀ 4.33 V 129.3 ㏀ -21°F (-30°C) 4.16 V 99.30 ㏀ -13°F (-25°C) 3.95 V 76.96 ㏀ -4°F (-20°C) 3.734 V 60.13 ㏀...
  • Page 72 9-4 How to check the Fan-Error (1) 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 - 73 -...
  • Page 74 10-2 Door Switch Function The switch senses if the door is open or closed. - When the door open, lamp on. - When the door open, the switch give information to Micom. When the door open, internal contact operate on and off moving plunger of door switch up and down.
  • Page 75 10 Dispenser DC Motor Function - Dispenser DC Motor : When customer push the dispenser button, Pull duct door and abstract from ice bank. How to Measure Dispensor DC Motor Standard Dispenser DC Motor Test Points Result 9.9 ~ 12.1 Ω (1) to (2) - 75 -...
  • Page 76 10-4 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 77 10-5 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 78 10-6 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 kΩ Red wire to Black wire - 78 -...

  • Page 79: Compressor Troubleshooting

    11. Compressor Troubleshooting PCB Check (Simplify) Protection Logic TEST 1 Mode A-inverter Con201 Time>30sec Power Off Power On PCB OK Disconnect & V≒200 Replace Driver PCB Check Voltage about 200V past 30second after turn on Test Mode Comp Ref. Display & sound Refer FLA075(A-Inverter) TEST1...
  • Page 80 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 - 80 -...
  • Page 81 11-2 Check B B1. LED blinks once, then repeats (FCT0 Fault: A-Inverter) Protection Logic Blink OFF Blink OFF - Purpose: Detecting motor current and voltage error - Check voltage at point A (Motor Voltage), point B (Motor Current) and Point C (Capacitor Voltage) when compressor is off.
  • Page 82 B3. LED blinks five times, then repeats (Locked Piston: A & E Inverters) Protection Logic Blink Blink Blink Blink Blink OFF - Purpose: To detect locked piston - Cause: Lack of oil to the cylinder, cylinder or piston damaged and or restricted discharge. A Locked Piston can also be caused by foreign materials inside the compressor.
  • Page 83 B5. LED blinks seven times, then repeats (IPM Fault: A & E Inverters) Protection Logic n i l n i l n i l n i l n i l n i l n i l - Purpose: Prevent high current due to IPM Short - Cause: Damaged IPM (Dead Short) - Test for a dead short at Point A with a VOM.
  • Page 84 11-3 Check C C1. Harness Connection Check Check Process C2. Capacitor Specifications C3. Compressor Check - Step 1. Power off. Step 2. Check capacitor spec. (table1). Step3. Check resistance of point A Step 4. Check wire harness (INF ohm). Step 5. Check resistance at point B. Step 6. Point D. Check Check Harness...
  • Page 85 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 - Locked Piston, Current trip and stroke trip can be activated by other problems then the driver or compressor. →...
  • Page 86 Compressor Troubleshooting Step 1) Open PWB cover Step 2) Check for blinking frequency of LED, PWB If 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 - 86 -...
  • Page 87 LED operating condition Cause Service guideline 1. Please check, Whether connector of PCB Parts compressor is attached defect or rightly or not. after LED two - time repetiton (Stroke Trip) Compress power off 2. After the first action, Connector You check on normal miss operation of - off -...
  • Page 88 11-5 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY • Is the power cord unplugged from the outlet? • Plug into the outlet. No Cooling. • Check if the power switch is set to OFF. • Set the switch to ON. •...
  • Page 89 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 90 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 91 12. ICEMAKER OPERATING METHOD AND TROUBLE SHOOTING 12-1 Icemaker’s Basic Operating Method Power On Power On Start Position • Adjusts Ice Tray to Start Position with power on. • Adjusts Ice Tray to Start Position with power on. • Waits until water becomes ice. Icemaking ※For cold air circulation, Ice tray will be Mode...
  • Page 92 12-2 ICE MAKER FUNCTIONS 12-2-1 Icemaking Mode 1. Icemaking Mode begins right after the ice tray fills with water. 2. Icemaker waits until water becomes ice in the ice tray. ※ Ice-detecting sensor checks if the ice bin is full every 2min. 12-2-2 Harvest Mode At least in 110min, since icemaker begun icemaking mode, Icemaker starts to twist the ice tray to drop ices into the Ice bin.
  • Page 93 12-3-2 Icemaker not making ice or not making enough ice (Icemaker Unit & Ice-detecting sensor Diagnosis) ▶ Icemaker Unit and Ice-detecting sensor Diagnosis The icemaker unit and Ice-detecting sensor is programmed to be diagnosed. Follow the procedure step by step to check to see if icemaker and Ice-detecting sensor is working normally. Icemaker Unit Ice-detecting sensor Fill Key...
  • Page 94 STEP (Ice-detecting sensor Diagnosis) 2. Close the left door 1. Remove Ice bin from compartment 3. Wait for 3min. (Door switch pushed) 4. Freezer door stays open 5. Push the refrigerator button & lock button at the same time. If “ETY” is shown on the display after the procedure above, Ice-detecting sensor is normal. If “FULL”...

  • Page 95: Description Of Function & Circuit Of Micom

    13. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM 13-1 FUNCTION 13-1-1 Function 1. When the appliance is plugged in, it is set to 37°F for Refrigerator and 0°F for freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button. 2.
  • Page 96 13-1-4 Filter condition display function 1. There is a replacement indicator light for the filter In initial Power On Blinking Classification cartridge on the dispenser. / Filter RESET 2. Water filter needs replacement once six months or of using water filter. Filter Status 3.
  • Page 97 13-1-7 CONTROL OF FREEZER FAN MOTOR 1. Freezer fan motor has high and standard speeds. 2. High speed is used at power-up, for Ultra Ice, and when refrigerator is overloaded. Standard speeds is used for general purposes. 3. To improve cooling speed, the RPM of the freezer fan motor change from normal speed to high. 4.
  • Page 98 13-1-12 Ice PLUS 1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice. 2. Whenever selection switch is pressed, selection/release, the Icon will turn ON or OFF. 3. If there is a power outage and the refrigerator is powered on again, Ice PLUS will be canceled. 4.

  • Page 99: Defect Diagnosis Function

    13-1-14 Defrosting (removing frost) 1. Defrosting starts each time the COMPRESSOR running time Betwee 7~50 hours. 2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours. 3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in 1 hours, the defrost mode is malfunctioning.
  • Page 100 CASE PARTS CAUTION: Use the part number to order part, not the position number. 603C 503E 603E 626A 624E 207B 207B 624G 503D 624C 503G 624A 409D 158A 271B 103B 103A 501F 207A 120A 150A 150C 150B 406D 150D 610D 120C 282G 405G...
  • Page 101 FREEZER PARTS CAUTION: Use the part number to order part, not the position number. 131A 136B 251A 251B 203C 237C 136A...
  • Page 102 REFRIGERATOR PARTS 141A CAUTION: Use the part number to order part, not the position number. 141C 141C 141A 141E 141E 141B 141B 141A 140A 141C 142D 142B 141E 142A 141B 141D 161C 161B 154A 151B 146A 151A 162B 161A 145D 162A...
  • Page 103 241K 231B 233B 233A 231A 212G 235A 241K 241D 241G 241D 312B 241E 243D 243C 262C 619B 615A 243A 244A 244A 243B 262E 262C 267A 250A 201A 200A 249E 203A 250B 253A 250B 249F 249K 249J 212D 250A 249E 250B 201B 200B 250B...
  • Page 104 DISPENSER PARTS CAUTION: Use the part number to order part, not the position number. 276A 276G 276F 275A 405A 276B 132P 279A 279I 278D 279H 279J 402C 278C 501D 279B 279D 500C 281B 279E 281A 501A 279C...
  • Page 105 VALVE & WATER TUBE PARTS CAUTION: Use the part number to order part, not the position number. 617A 625A 616G 616D 616G 623B 616J 623B 616J 616F 603C 627B 627A 619A 603B...
  • Page 106 630J 630J 612A 630F 630B 607A 630C 600A 611A 630A 630H 630D 606A 630E 630Q 630G...

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