LG WM3700H A /01 Series Service Manual
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LG WM3700H A /01 Series Service Manual

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WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODELS : WM3700HWA /02
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or
transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity
from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in
this Service Manual.
Copyright © 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
WM3700HVA /01
CONFIDENTIAL

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Summary of Contents for LG WM3700H A /01 Series

  • Page 1 Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.

  • Page 2: Table Of Contents

    10-1. Cabinet and Control Panel Assembly ................... 5 10-2. Drum and Tub Assembly ...................... 5 10-3. Dispenser Assembly ......................5 11. Wiring Diagram ..........................5 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Specifications

    Only training and service purposes. Copyright © 2016 - 2017 LG Electronics Inc. All rights Copyright © 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 4: Features And Technical Explanation

    NFC (Tag On Function) This feature uses LG Smart DiagnosisTM, Cycle Download, and Laundry Stats when you touch the LG appliance’s Tag On logo with your NFC equipped smartphone. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 If a power failure has occurred while in operation, the door will unlock after 5 minutes. Clicking sounds can be heard when the door is locked/unlocked. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 Be aware that there is a minimum performance rating that the NFC feature must meet or exceed in order for the Tag On feature to run. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Parts Identification

    3. PARTS IDENTIFICATION Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 8: Installation And Test

    Keep the shipping bolts and spanner for future use. Insert the 4 caps (provided) into the hole. Keeping Turn clockwise to raise; counterclockwise to lower. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 CONNECT POWER PLUG • Avoid connecting several electric devices, • Connect the power plug to the wall outlet. as doing so may cause a fire. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 • Listen for a click to determine if the • If SERVICE is needed during door is unlocking. check, remove the remaining water by pulling out the hose cap. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Operation

    5-1 . CONTROL PANEL FEATURE S WM3700H*A /01 reserved. Only training and service purposes. Copyright © 2016 - 2017 LG Electronics Inc. All rights Copyright © 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 Water Plus : To add water during wash and rinse cycle. event wrinkles. Steam : Use this option for extra cleaning power. Wash Temp., Spin speed, Soil Level, Signal Button Spin, Soil Spin, Soil Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 14: Cycle Guide

    Bedding Normal Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 15: Special Functions

    Also, it is possible to monitor your cycle operation so you know how much time is left in the cycle. Wi-Fi Connect Use this option for connecting to the internet through your home Wi-Fi network Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Explanation Of Each Process

    UE. • If the eccentricity is good, the intermittent spin starts. • During this process, the drain pump works for drainage intermittently. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 • After door switch is off, end signal is displayed in the case of manual type and it takes around 2 minute to turn off door switch. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 18: Test Mode

    Please change this service part. There is no problem with Wi-Fi module. This is wi-fi program version. Wi-Fi version can be change. WASH/RINSE DELAY WASH Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Troubleshooting

    7. TROUBLESHOOTING 7. TROUBLESHOOTING Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 This adds about two hours to the cycle time. If too many suds are detected during spinning, the washing machine stops to help prevent leaking. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 21: Troubleshooting With Error

    7-3. TROUBLESHOOTING WITH ERROR INLET VALVE ERROR Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 (Red 3P, male) - part of wire Replace the Check the IPM in the MAIN PWB controller. ASSEMBLY. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 45 Celsius and must not have more amount of supplied water Replace Does the spring of Latch than it should. Door Hook actuate? Assembly. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 UNBALANCE ERROR OVER FLOW ERROR Delay Wash Soil [Note] Installation check list Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 (21~23 ±10%) Fix the air Is the AIR CHAMBER and chamber the tube clogged? and remove the foreign material. Replace the MAIN PWB assembly. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 27: Troubleshooting Else

    Display PWB Reconnect Is the connector connected or repair to PCB/Noise filter the connector. disconnected or disassembled? Connecting connector MAIN PWB~ Display PWB Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 BUTTON DOESN’T WORK Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 (1) Liquid chlorine Bleach Compartment (2) Liquid fabric Softener Compartment (3) Prewash Compartment (4) Main Wash Compartment Is the detergent caked or Clean the hardened? dispenser. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 (3) Prewash Compartment (4) Main Wash Compartment Is the liquid detergent/ Clean the cap softener/bleach cap clogged? container. Pre-Wash Liquid Bleach Only& Softener Liquid detergent cap Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 32: Before Using The Tag On Function

    • To verify the Wi-Fi connection, check that Wi-Fi NOTE icon on the control panel is lit. • If you choose the simple login to access the LG SmartThinQ application, you must go through • The appliance supports 2.4 GHz Wi-Fi networks the appliance registration process each time you only.

  • Page 33: Component Testing Information

    MAIN PWB A S S EMBLY FUSE Test points Result T est Points Result WH (1) to RD (3) WH (3) to RD (1) Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 – maximum of 3 times of the authorizing period. - Upon the fourth authorization of the impulse, the position of CAM goes back to the door-close position. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 700-1500 At 77 °F °C (3) to (4) 60-90 At 77 °F °C (4) to (5) Infinity (2) to (4) 120 Vac Voltage Input Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 36: Stator Assembly

    Test points (Windings) WINDINGS Result Test Points Result (Windings) (1) to (2) 5-15 (2) to (3) 5-15 (3) to (1) 5-15 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 38: Inlet Valve Assembly

    8-5. INLET VALVE ASSEMBLY Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 Circuit in the MAIN PCB / Wiring Diagram Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 At 104°F (40°C) 26.1 k At 140°F (60°C) 12.1 k At 158°F (70°C) 8.5 k 3.8 k At 203°F (95°C) At 221°F (105°C) 2.8 k Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 41: Disassembly Instructions

    (7) Unlock all 7 locking snaps & hooks from the control panel assembly. (8) Remove rotary Knob and disassemble the control panel PCB assembly. (9) Disconnect control panel PCB connectors from the Display PCB. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 42 4. Push PCB in shown direction and take out. locking hook in highlighted direction. 5. Disconnect the connectors 2. Unlock all three highlighted hooks. 3. Remove the protective cover. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 43 Disassemble the 4 connectors from the valves. Wire Color Yellow Housing (BR-BK) White Housing (OR-BK) Blue Housing (BL-BK) Red Housing (GY-BK) Unscrew 1 screws from the back of the cabinet. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 44 NOISE FILTER (1) Disassemble both connectors from the noise filter. (2) Unlock the locked site. (3) Pull out noise filter in highlighted direction. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 45 Reach up to the ceiling of the pump case cover and pull forward to remove. Unscrew the screw from the lower side of the cabinet cover. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 NOTE : When assembling the cabinet cover, connect the door switch connector. Lift and separate the cabinet cover. Disassemble the clamp assembly. Disassemble the gasket. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 47 Open the door and remove the gasket using the special gasket pliers. Unscrew the 2 screws. NOTE • Reconnect the connector after replacing the door switch assembly. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 Separate the pump hose, the bellows assembly from the pump assembly. BELLOWS Unscrew the 2 screws and disassemble the pump assembly follow red arrow direction. Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 49 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 50: Cabinet And Control Panel Assembly

    A150 A141 A101 A108 A151 A154 A152 A153 A156 A390 A100 A131 A130 A430 A140 A133 A440 A155 A300 A310 A201 A220 A303 A200 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 51 K200 K123 K143 K360 K6 10 F140 K6 11 K4 11 K310 K4 10 F315 K464 K461 F463 K516 K190 K135 K530 K501 K320 K100 K130 K132 K340 F464 K344 K520 F4 68 K439 F468 K346 K550 K540 F1 45 K342...

  • Page 52: Dispenser Assembly

    DISPENSER ASSEMBLY F322 F323 F462 F321 F300 F170 F301 F160 F227 F226 F430 F220 F225 F120 F432 Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 53: Wiring Diagram

    - 20 *Door Switch Makes / Breaks Neutral Press Delay Wash & Wash Temp.= Temp. Celsius Side of Line (3) Rd to (1) YL Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 54 P/No. MFL68588942...

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