LG LFCS25426 Series Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Refrigerator
  5. LFCS25426 SERIES
  6. Service manual

LG LFCS25426 Series Service Manual

Hide thumbs Also See for LFCS25426 Series:
Table of Contents

Advertisement

Quick Links

REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE PRODUCT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MODELS : LFC25776SW
LFC25776SB
LFC25776ST
LFCS25426*
COLORS : SUPER WHITE(SW)
WESTERN BLACK(
STAINLESS(ST)
Diamond Black
SB )

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LFCS25426 Series and is the answer not in the manual?

Questions and answers

Aftan Ahmed
April 8, 2025

Need compressor with overload relay,

0

Related Manuals for LG LFCS25426 Series

Summary of Contents for LG LFCS25426 Series

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE PRODUCT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. COLORS : SUPER WHITE(SW) MODELS : LFC25776SW LFC25776SB WESTERN BLACK( SB ) STAINLESS(ST) LFC25776ST LFCS25426* Diamond Black...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 1. SPECIFICATIONS ................................3 2. PARTS IDENTIFICATION ..............................4 3.DISASSEMBLY------------------------------------------------------------------------------------------------------------------ ---------------------5-12 REMOVING AND REPLACING REFRIGERATOR DOORS -------------------------------------------------------------------------------5-6 DOOR -------------------------------------------------------------------------------------------------------------------------------------------------------7 DOOR ALIGNMENT -------------------------------------------------------------------------------------------------------------- -----------------------8 LAMP------------------------------------------------------------------------------------------------------------------------- --------------------------------8 MULTI DUCT------------------------------------------------------------------------------------------------------------------- ----------------------------8 MAIN PWB--------------------------------------------------------------------------------------------------------------------- -----------------------------8 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER-----------------------------------------------------------------------9-10 WATER VALVE DISASSEMBLY METHOD-------------------------------------------------------------------------------------------------------11 FAN AND FAN MOTOR DISASSEMBLY METHOD----------------------------------------------------------------------------------------- ---11 PULLOUT DRAWER------------------------------------------------------------------------------------------------------------------------------------12...

  • Page 3: Specifications

    1. SPECIFICATIONS 25cu.ft ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DOOR DESIGN Side Rounded VEGETABLE TRAY Opaque Drawer Type DIMENSIONS(inches) 35 X 34 X 69 (WXDXH) 25cu.ft COMPRESSOR Linear NET WEIGHT(pounds) 324.18 (25cu.ft) EVAPORATOR Fin Tube Type COOLING SYSTEM Fan Cooling CONDENSER Spiral Condenser TEMPERATURE CONTROL Micom Control REFRIGERANT...

  • Page 4: Parts Identification

    2. PARTS IDENTIFICATION Digital Sensor Control Mullion Dairy Bin Refrigerator Light Shelves Modular Door Bin Modular Door Bin Bottle Holder Optibin Crisper Keeps fruits and vegetable fresh and crisp Modular Door Bin Glide'N'Serve AUTOMATIC ICEMAKER Pullout Drawer Ice Bin Durabase Divider - 4 -...

  • Page 5: Disassembly

    3. DISASSEMBLY 3-1 REMOVING AND REPLACING REFRIGERATOR DOORS REFRIGERATOR DOOR REMOVAL (CONT.) To remove the left refrigerator door: To remove the right refrigerator door: Open the door. Remove the top hinge cover screw (1). • Open the door. Remove the top hinge cover Use a flat blade screwdriver to lift the tabs screw (1).
  • Page 6 REFRIGERATOR DOOR REINSTALLATION • Fit the top hinge (1) over the hinge lever Install the right-side door first. Lower the door onto the middle hinge pin as latch (2) and into place. Rotate the lever (3) shown. counterclockwise to secure the hinge. Make sure the plastic sleeve is inserted in the •...

  • 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. Figure 5 Figure 1 2. Lift Mullion up carefully. Mullion Replacement 1. Connect wire harness. Figure 2 3.

  • Page 8: Door Alignment

    3-4-2 Freezer Compartment Lamp 3-3 Door Alignment 1. Unplug refrigerator power cord form outlet. If the space between your doors is uneven, follow the 2. Remove screw with driver. instructions below to align the doors: 3. Grasp the cover Lamp, pull the cover downward. Remove the Base Grillie.

  • Page 9: How To Remove And Reinstall The Pullout Drawer

    3-7 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER 3-7-1 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 lifting clear from each side).
  • Page 10 3-7-2 FOLLOW STEPS TO REINSTALL Step 1) Insert both side of supporter cover tv into ① Assemble a bar and gear ice with screw. Step 2) ② Push the otherside of the gear to inside of the connector rails, and then screw them. bar.

  • Page 11: Water Valve Disassembly Method

    3-8 WATER VALVE DISASSEMBLY METHOD 3-9 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 12: Pullout Drawer

    3-10 PULL OUT DRAWER To remove the freezer drawer, pull the drawer open to full extension. Remove the lower DuraBase ®basket by lifting basket from the rail system. - 12 -...

  • Page 13: 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 14: Circuit Diagram

    5. CIRCUIT DIAGRAM - 14 -...

  • Page 15: Troubleshooting

    6. TROUBLESHOOTING 6-1 Error Code Summary WARNING: When you check the Resistance values, be sure to turn off the power. And wait for the voltage-discharge sufficiently. NOTE) 3 hours before the error : Press the Ice Plus button and Freezer button simultaneously 3 hours after the error : All errors, except for “Er rt”, “Er HS”,“Er IS”, “Er It”...

  • Page 16: Pcb Picture

    7. PCB Picture 7-1 Main PCB P/No & MFG Picture CON4 CON7 CON201 EBR74796405 (2013.03~) CON5 CON1 CON3 CON2 - 16 -...

  • Page 17: Display Pcb & Sub Pcb

    7-2 Display PCB & Sub PCB Picture P/No CON01 Display PCB EBR42479314 (2013.03~) -17 -...

  • Page 18: Troubleshooting With Error Display

    8. Troubleshooting With Error Display 8-1 Freezer Sensor Error (Er FS) Checking flow Result & SVC Action Check for a loose connection. Check the Blue/White to Result SVC Action Blue/White. Short Change the sensor Open Replace the refrigerator Check the Temp and Normal resistance (Table-1) <Temperature table-1>...
  • Page 19 8-2 Refrigerator Sensor Error (Er rS) Checking flow Result & SVC Action Check for a loose connection. Check the White to White. Result SVC Action 0 Ω Short Change the sensor Open Replace the refrigerator Check the Temp and Other Normal resistance (Table-2) <Temperature table-2>...
  • Page 20 8-3 Icing Sensor Error (Er IS) Checking flow Result & SVC Action Check for a loose connection. Check the Red to Bright Orange. Result SVC Action Short Change the sensor 0 Ω Open Replace the refrigerator Check the Temp and Other Normal resistance (Table-1)
  • Page 21 8-4 Defrost Sensor Error (Er dS) Checking flow Result & SVC Action Check for a loose connection. Check the Orange to Orange. Result SVC Action Short Change the sensor 0 Ω Open Replace the refrigerator Check the Temp and Other Normal resistance (Table-3) Check the Brown to Brown.
  • Page 22 8-5 Defrost Heater Error (Er dH) Checking flow Result & SVC Action Check the Door gasket. Part Result SVC Action Go to the 3 0 Ω Check the Defrost control part. Fuse-M Change Fuse-M Other Go to the 3 34~42 Ω Fuse Def’...
  • Page 23 8-6 Freezer Fan Error (Er FF) Checking flow Result & SVC Action Reset the unit and Input Test 1 Mode. (Push the button 1 time) Open the freezer door and Check the Status SVC Action air flow. No windy Go to 3 ※...
  • Page 24 8-7 Condenser Fan Error (Er CF) Checking flow Result & SVC Action Reset the unit and Input Test 1 Mode. (Push the button 1 time) Check the fan rotating. Status SVC Action ※ While an error code is displayed, No windy Check motor the fan is not working.
  • Page 25 8-8 Communication Error (Er CO) Checking flow Result & SVC Action Check the loose connection. Check the Orange to White/Black. Result SVC Action 12 V Go to the 3 Check the Hinge CON01 Other (loose connection) Change the Main PCB <Display>...

  • Page 26: Troubleshooting Without Error Display

    9. Troubleshooting Without Error Display 9-1 Freezer room AC Bulb Lamp doesn’t work Checking flow Result & SVC Action Check the Freezer door switch. If feel sticky, Change the door s/w. Check the door S/W resistance. Status Result SVC Action Go to the 3 0 Ω...
  • Page 27 9-2 Refrigerator room lamp doesn’t work Checking flow Result & SVC Action Check the Refrigerator door switch. If feel sticky, Change the door s/w. Check the door S/W resistance. Status Result SVC Action Go to the 3 0 Ω Normal Infinity Change door S/W Infinity...
  • Page 28 9-3 Poor cooling in Fresh food section Checking flow Result & SVC Action Check the sensor resistance. (1) To (2) Result 23°F / -5°C 38.5 ~ 36.5KΩ 32°F / 0°C 30.5 ~ 29.5KΩ 41°F / 5°C 24.5 ~ 23.5KΩ 20 ~ 19KΩ 50°F / 10°C <CON7>...
  • Page 29 Checking flow Result & SVC Action Damper checking method. Test Damper Inputting TEST Mode, SVC Action Mode State Check the damper and PCB. 1 Mode Open Damper is normal. (Explain to customer) 2 Mode Closed Change the damper mode working Test Point Result SVC Action...
  • Page 30 9-3 Poor cooling in Freezer compratment Checking flow Result & SVC Action Check the sensor resistance. (1) To (2) Result -22°F / -30°C 40.5 ~ 38.5KΩ -13°F / -25°C 30.5 ~ 28.5KΩ -4°F / -20°C 23 ~ 21.5KΩ 5°F / -15°C 17.5 ~ 16.5KΩ...
  • Page 31 9-4 Over cooling in Fresh food compartment Checking flow Result & SVC Action Check the sensor resistance. (1) To (2) Result 23°F / -5°C 38.5 ~ 36.5KΩ 32°F / 0°C 30.5 ~ 29.5KΩ 41°F / 5°C 24.5 ~ 23.5KΩ 20 ~ 19KΩ 50°F / 10°C <CON7>...

  • Page 32: Reference

    10. Reference 10-1 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) * 2 times : Damper closed (22 22 displayed)
  • Page 33 10-2 TEMPERATRUE CHART - FRZ AND ICING SENSOR TEMP RESISTANCE VOLTAGE -39°F (-40°C) 4.09 V 73.29KΩ -30°F (-35°C) 3.84 V 53.63KΩ -21°F (-30°C) 3.55 V 39.66KΩ -13°F (-25°C) 3.23 V 29.62KΩ -4°F (-20°C) 2.89 V 22.33KΩ 5°F (-15°C) 2.56 V 16.99KΩ...
  • Page 34 10-3 TEMPERATRUE CHART - REF AND DEF SENSOR TEMP RESISTANCE VOLTAGE 225.1 ㏀ -39°F (-40°C) 4.48 V -30°F (-35°C) 169.8 ㏀ 4.33 V -21°F (-30°C) 129.3 ㏀ 4.16 V -13°F (-25°C) 99.30 ㏀ 3.95 V 76.96 ㏀ -4°F (-20°C) 3.734 V 60.13 ㏀...
  • Page 35 10-4 How to check the Fan-Error (1) EBR747964 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 36: Component Testing Information

    11. COMPONENT TESTING INFORMATION 11-1 Defrost Controller Assembly Function - Controller assembly is consist of 2 kinds of part those are fuse-m and sensor. we can decide part is defect or not when we check the resistance. - Fuse-m can cut off the source when defrost heater operate the unusual high temperature. - Sensor give temperature information to Micom How to Set a ohmmeter to the 2 housing pin.
  • Page 37 11-2 Sheath Heater Function Sheath heater is a part for defrost. All heating wire is connected to only one line. So we can decide part is defect or not when we check the resistance. How to Measure (1) (2) Set a ohmmeter connect to The 2 housing pin. Measure the 2 pin connected to Sheath Heater.
  • Page 38 11-3 Door Heater Assembly Function The heater is designed to prevent the raising dew from door. How to Measure Standard Test Point Ressult 2.3 ~ 2.9 Ω (1) to (2) -38-...
  • Page 39 11-4 Door Switch Function The switch sense if the door open or close. - 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 40 11-5 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) -40-...
  • Page 41 11-6 AC Motor ASSEMBLY Function The In-door motor of AC motor assembly pushes ices to the dispenser. How to < In-door Motor > < In-door Motor > Measure Take out the male Take out the male housing from housing from female housing female housing Measure the...
  • Page 42 11-7 Damper Function The damper supplies the cold air at freezer room to chillroom by using the damper’s plate. Chillroom is colder than before when damper’s plate is open. When damper’s plate is close, chillroom’s temperature will rise. How to Measure <...
  • Page 43 11-8 Lamp Socket Function The lamp socket connect cover lamp assembly to lamp. The lamp socket fix lamp and unite lamp and cover lamp assembly. The lamp socket supply electric source to lamp also. How to Measure Check the resistance between connector of housing and connector of lamp socket. It means check whether or not applying an electric current.
  • Page 44 11-9 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 Ω Red wire to Black wire -44-...

  • Page 45: Troubleshooting

    12. 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 FC75(A-Inverter) TEST1...
  • Page 46 12-1 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 -46-...
  • Page 47 12-2 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 48 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 49 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 50 12-3 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 51 12-4 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 52 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 -52-...
  • Page 53 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 54 12-5 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 55 12-6 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 56 12-6-2 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 57: Ice Maker And Dispenser Working Principles And Repair

    13. ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 13-1 Working Principles 13-1-1 Ice Maker Working Principles Power Input Level Ice Maker Cube Mould for “Initial Control” Initial Control after power is input. Ice Making Wait until the water in the cube mould is frozen Control after ice maker starts operation.
  • Page 58 13-2 Function of Ice Maker 13-2-1 Initial Control Function 1. When power is initially applied or reapplied after power cut, it detects level of ice maker cube mould after completion of MICOM initialization. The detecting lever moves up and down. 2.
  • Page 59 13-2-4 Ice Ejection Control Function 1. This is to eject ice from ice maker cube mould after ice making is completed. 2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed ice ejection but waits.
  • Page 60 13-2-5 Test Function 1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic ice maker. The test function starts when the test switch is pressed for more than 0.5 second. 2.

  • Page 61: Exploded View & Replacement Parts List

    EXPLODED VIEW & REPLACEMENT PARTS LIST CASE PARTS CAUTION : Use the part number to order part, not the position number. 207B 610F 503C 402A 103B 500P 103A 207A 271B 207C 402A 503A 503E 406D 120A 501F 409D 282G 503D 271D 500A 610A...
  • Page 62 FREEZER PARTS CAUTION : Use the part number to order part, not the position number. 133B 145C 136C 136B 133A 145F 237C 136A...
  • Page 63 REFRIGERATOR PARTS CAUTION : Use the part number to order part, not the position number. 141B 141A 141C 141B 141A 141E 141C 141B 141A 141C 141E 141B 141A 141E 141C 141D 161C 161B 141E 154A 151B 151A 146E 162B 161A 145D 162A...
  • Page 64 D OO R PAR TS CAUTION : Use the part number to order part, not the position number. 230A 230B 241A 231B 233B 233A 231A 241C 241B 241D 212G 235A 241D 241D 241D 241E 241D 243D 241E 243C 243A 262C 243E 243B 267A...
  • Page 65 WATER AND ICEMAKER PARTS CAUTION : Use the part number to order part, not the position number. 600F 600B 627A 619A...

This manual is also suitable for:

Lfc25776swLfc25776sbLfc25776st

Table of Contents