LG WM3431H Series Service Manual
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LG WM3431H Series Service Manual

LG WM3431H Series Service Manual

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See also: Owner's Manual

WASHING MACHINE

SERVICE MANUAL

CAUTION
!
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL: WM3431H*/WM3434H*
WD-14312RD/WD-14316RD
Website: http://www.LGEservice.com [For U.S.A]
www.lg.ca [For CANADA]
E-mail: http://www.LGEservice.com/techsup.html

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Summary of Contents for LG WM3431H Series

  • Page 1: Washing Machine

    Website: http://www.LGEservice.com [For U.S.A] www.lg.ca [For CANADA] E-mail: http://www.LGEservice.com/techsup.html WASHING MACHINE SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT. MODEL: WM3431H*/WM3434H* WD-14312RD/WD-14316RD...
  • Page 2 JAN. 2005 PRINTED IN KOREA P/No.:3828ER3035Q...

  • Page 3: Table Of Contents

    CONTENTS 1. SPECIFICATIONS .........................3 2. FEATURES & TECHNICAL EXPLANATION ................4 3. PARTS IDENTIFICATION ......................6 4. INSTALLATION & TEST ....................... 7 5. OPERATION ..........................10 6. WIRING DIAGRAM/PROGRAM CHART ..................12 7. TROUBLESHOOTING.........................13 7-1. BEFORE PERFORMING SERVICE ...................13 7-2. QC TEST MODE.........................13 7-3.

  • Page 4: Specifications

    1. SPECIFICATION ITEM WM3431H , WD-14312RD, WD-14316RD WM3434H* POWER SUPPLY AC 120 V, 60 Hz PRODUCT WEIGHT 147 lbs. (68 kg) 140 W WASHING 410 W SPIN ELECTRIC 25 W FAN MOTOR POWER 80 W DRAIN MOTOR CONSUMPTION 1000 W...

  • Page 5: Features & Technical Explanation

    2. FEATURES & TECHNICAL EXPLANATION 2-1.FEATURES Automatic Process From Washing To Drying Automatic process from washing to drying can be selected easily. More economical by using Intelligent Wash System Intelligent Wash System detects the amount of load and water temperature, and then determines the optimum water level and washing time to minimize energy and water consumption.

  • Page 6: Water Level Control

    2-2. NEURO FUZZY WASHING TIME OPTIMIZATION To get the best washing performance, optimal time is determined by the water temperature, the selected washing temperature, and the size of the load. water temperature washing time the best selected NEURO- washing washing rinsing time temperature FUZZY...

  • Page 7: Parts Identification

    3. PARTS IDENTIFICATION ACCESSORIES...

  • Page 8: Installation & Test

    4. INSTALLATION & TEST Before servicing, ask the customer what the trouble is. Check the setup (power supply is 120 V AC, remove the transit bolts..). Check with the troubleshooting guide. Plan your service method by referring to the disassembly instructions. Service the unit.
  • Page 9 HOW TO CONNECT THE INLET HOSE Verify that the rubber washer is inside of the valve connector. Tighten the inlet hose securely to prevent leaks. CONNECT THE DRAIN HOSE Make sure that the hose is not twisted. Avoid submerging the end of the hose. The end of the drain hose should be placed less than 96”...

  • Page 10: Test Operation

    TEST OPERATION Preparation Press the POWER button. Press the Start/Pause for washing. button. Connect the power plug to the outlet. Connect the inlet hose. Check the water heating Check automatic reverse Check the water supply. function. rotation. Press the Wash/Rinse button Check if the drum rotates Check if water is supplied and the present temperature will...

  • Page 11: Operation

    5. OPERATION • Use this option to pre • Use this button to turn the power • This display shows: Press and hold Dela On/Off. a) the estimated time remaining in the lock/unlock control. cycle when operating. • When Child lock is s b) an error code when an error has been are disabled except t detected.

  • Page 12: Delay Wash

    • Delay Wash o prevent unwanted use of the washer. • Allows the start of any cycle to elay Wash button for 3 seconds to be delayed for 1~19 hours. • These lights show which portion of the cycle the washer is s set, Child Lock lights and all buttons operating.

  • Page 13: Wiring Diagram/Program Chart

    6. WIRING DIAGRAM PROGRAM CHART DISPLAY MAIN PWB 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 3 2 1 1 2 3 4 5 6 1 2 3 1 2 3 3 2 1 WH SB GY PI WH BK YL...

  • Page 14: Troubleshooting

    7. TROUBLE SHOOTING 7-1. BEFORE PERFORMING SERVICE Be careful of electric shock when disconnecting parts while troubleshooting. The voltage of each terminal is 110/120 V AC and DC when the unit is plugged in. 7-2. QC TEST MODE. The washer must be empty and the controls must be in the off state. 1.

  • Page 15: Error Display

    7-4. ERROR DISPLAY If you press the Start/Pause button when an error is displayed, any error except will disappear and the machine will go into the pause status. In case of if the error is not resolved within 20 sec., or in the case of other errors, if the error is not resolved within 4 min., power will be turned off automatically and the error code will blink.
  • Page 16 ERROR SYMPTOM CAUSE • MAIN PWB ASSEMBLY is out of order Replace the MAIN PWB ASSEMBLY CURRENT • Winding in the STATOR ASSEMBLY is short-circuited. ERROR Replace the STATOR ASSEMBLY • “ ” is dispplayed during a high spin Replace the LEAD WIRE ASSEMBLY (MOTOR) •...

  • Page 17: Error Diagnosis And Checklist

    8. ERROR DIAGNOSIS AND CHECKLIST 8-1. DIAGNOSIS AND SOLUTION FOR ABNORMAL OPERATION SYMPTOM GUIDE FOR SERVICE CALL NO POWER Is the power plug connected firmly to 120V~ outlet? Power failure? or Breaker opened? Visit to check Water inlet trouble Is " "...
  • Page 18 SYMPTOM GUIDE FOR SERVICE CALL • Door does not open Started with door opened? • Error displayed on the program Close the door Visit to check Check if the door switch is O K. • DRAIN TROUBLE Is " " displayed? Is the drain pump filter clogged with foreign Clean up material such as pin, coin and etc.?
  • Page 19 SYMPTOM GUIDE FOR SERVICE CALL Suds overflow from the Is low-sudsing detergent for the drum appliance. washing machine used? (In this condition, wash and spin do not operate LOW-SUDSING normally) Is the proper amount of detergent used as recommended? Reduce the amount of detergent. This appliance has the automatic suds sensing function which operates during high-sudsing for good rinse and preventing overflow.

  • Page 20: Fault Diagnosis And Troubleshooting

    8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING CAUTION 1. Be careful of electric shock or disconnecting the parts while trouble shooting. 2. First of all, check the connection of each part terminal with wiring diagram. 3. If you replace the MAIN PWB ASSEMBLY, put in the connectors correctly. NO POWER Is the supplied voltage 120 V AC? Check the fuse or reset...

  • Page 21: No Water Supply

    NO WATER SUPPLY Is water supply shut-off? Is the tap opened? Open the tap. When you press both Wash/Rinse button and Check the AIR CHAMBER Spin Speed button simultaneously, is the water and the tube (clogged). level frequency below 240? Is the inlet valve filter clogged? Clean the filter.
  • Page 22 SOFTENER/BLEACH DOES NOT FLOW IN Refer to Is water supplied? NO WATER SUPPLY Are receptacles correctly connected to the terminals Check the wiring. of the INLET VALVE ASSEMBLY? Is softener/bleach put in the correct compartment of Put it in the correct compartment.

  • Page 23: Heating Without Water

    HEATING WITHOUT WATER When pressing Wash/Rinse and Spin Speed at the same time after draining, is the water level frequency 255? Replace the When pressing and Spin Speed buttons SENSOR SWITCH at the same time while washing, is the water level ASSEMBLY.
  • Page 24 washing, is the voltage 120 V AC? AC 120V HEATING CONTINUOUSLY ABOVE THE SETTING WATER TEMPERATURE Wash/Rinse, Extra Hot : 70°C Hot : 50°C MAIN PWB ASSEMBLY. Warm : 40°C Cold : 25°C Check electrical connection. Replace THERMISTOR. When checking THERMISTOR on the tub, is the Push the THERMISTOR THERMISTOR loosened? tightly to the rubber.
  • Page 25 S P I N T R O U B L E Check the SENSOR SWITCH Check during spin if the frequency of the water ASSEMBLY or HOSE (Pressure). level is 248 or more. If the problem is on the SENSOR SWITCH ASSEMBLY or the HOSE, replace the SENSOR SWITCH ASSEMBLY or the...
  • Page 26 [dHE] ERROR DISPLAY Dry duct Replace the thermistor. Condensing CHECK FOR DRY HEATER TROUBLE duct Thermistor CHECK FOR DRY FAN MOTOR TROUBLE Disassemble the cabinet cover and condensing bellows. Clean the bellows Is there any foreign object in condensing bellows. Disassemble the dry fan assy and dry duct upper, and clean foreign object in duct and fan.
  • Page 28 20~30 Black Yellow...
  • Page 29 Is the tap opened? Is the inlet valve filter clogged? Replace the INLET Is resistance between each terminal of VALVE ASSEMBLY. INLET VALVE ASSEMBLY 0.8-1.2 kΩ? Check electrical connection. Verify the voltage of the inlet valve connector Replace the MAIN PWB is 120 V AC.

  • Page 30: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS Be sure to unplug the machine from the outlet before disassembling and repairing the parts. CONTROL PANEL Unscrew 2 screws on the back of the top plate. PLATE ASSEMBLY(TOP) Pull the top plate backward and upward as shown.
  • Page 31 PWB ASSEMBLY(MAIN) Unscrew the 4 screws from the back cover. Unscrew the 2 screws from the lower-left side of the cabinet. Disconnect the connectors. Disassemble the Main PWB Assembly in arrow direction. DISPENSER ASSEMBLY Disassemble the Top plate assembly. Pull out the drawer. Unscrew the 2 screws and push out the dispenser assembly.
  • Page 32 INLET VALVE Disassemble the 4 connectors from the valves. Unscrew the 2 screws from the back of the cabinet. Wire color VALVE (DRY) YL - BK VALVE (BLEACH) GY - BK VALVE (MAIN WASH) WH/ - BK VALVE (HOT) BL - BK DOOR Open the door.
  • Page 33 GASKET ASSEMBLY Disassemble the clamp assembly. Unscrew the 2 screws from cabinet cover. Unscrew the screw from filter cover. Put a flat ( - ) screwdriver or putty knife into the both sides of the filter cover, and pull it out.
  • Page 34 Disassemble the clamp assembly. Tub Gasket Clamp Remove dry gasket clamp by loosening the screw. When reassembling the gasket, put the drain hole of the gasket downward. Drain Hole...
  • Page 35 ROTOR ASSEMBLY, STATOR ASSEMBLY, FRICTION DAMPER Disassemble the back cover. Remove the bolt. Pull out the Rotor. Rotor Bolt Unscrew the 2 screws from the tub bracket. Remove the 6 bolts on the stator. Unplug the 2 connectors from the stator. HOW TO ASSEMBLE THE MOTOR Disassemble the damper hinges from the tub and base.
  • Page 36 PUMP Disassemble the cabinet cover. Separate the pump hose and the bellows from the pump assembly. Disassemble the pump assembly in arrow direction. HEATER Disassemble the back cover. Separate 2 connectors from the heater. Loosen the nut and pull out the heater. Washing Heater Ring Terminal...
  • Page 37 SWITCH ASSEMBLY, DOOR LOCK Open the door and disassemble the Clamp assembly. Unscrew the 2 screws. Disconnect the connector from the Door switch assembly. NOTE Reconnect the connector after replacing the DOOR SWITCH ASSEMBLY. WHEN A FOREIGN OBJECT IS STUCK BETWEEN DRUM AND TUB Disassemble the back cover.
  • Page 38 Remove 6 screws and dry fan assembly. Dry fan Ass'y Remove 7 screws and dry duct upper. Dry Duct Upper Remove 2 screws and dry heater. Thermostat Remove thermostat. Dry Heater Remove 17 screws from Dry duct upper and Dry fan Assembly. Remove 5 screws and condensing duct.

  • Page 39: Exploded View

    10. EXPLODED VIEW AND PART LIST 10-1.THE PART LIST OF CABINET ASSEMBLY A154 A153 A110 A106 A120 A140 A152 A151 A101 A102 A104 A150 A103 A141 A100 A131 A485 A130 A430 A440 A134 A133 A450 A410 A200 A303 A300 A310 A201 A276 A220...

  • Page 40: Control Panel & Dispenser Assembly

    10-2. CONTROL PANEL & DISPENSER ASSEMBLY F462 F324 F322 F436 F300 F170 F160 F321 F226 F430 F225 F227 F441 F220 F120 F110 F210 F432 F130 F215...

  • Page 41: Drum & Tub Assembly

    10-3.DRUM & TUB ASSEMBLY K351 K350 K360 K143 K123 F140 K411 K121 K122 K410 K125 F320 F466 K146 F465 K320 F464 K310 F463 K110 K141 F310 K311 K140 K105 K115 K130 K111 K135 K610 K510 K611 K131 K530 F468 K342 F467 K550 K346...

  • Page 42: Dryer

    10-4.DRYER M100 M130 K311 M240 M120 M111 M230 M110 M216 M210 M140 M215 M101 M220 M105 K311...

This manual is also suitable for:

Wm3434h seriesWd-14312rdWd-14316rd

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