LG WM4370H A Series Service Manual
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LG WM4370H A Series Service Manual

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WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
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 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
Website : http://biz.lgservice.com
MODEL: WM4370H*A
1

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Summary of Contents for LG WM4370H A Series

  • Page 1 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 ................... 54 10-2. Drum and Tub Assembly ...................... 55 10-3. Dispenser Assembly ......................56 11. Wiring Diagram ..........................57 LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Specifications

    LGE Internal Use Only Copyright © 2016 ~ 2017 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. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights...
  • 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. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 Tag On icon on the appliance. NFC reading performance of your smart phone must be higher than a certain level for using this function. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Parts Identification

    (sold separately) NOTE Contact LG Customer Service at 1-800-243-0000 (1-888-542-2623 in Canada) if any accessories are missing. For your safety and for extended product life, use only authorized components. The manufacturer is not responsible for product malfunction or accidents caused by the use of separately purchased unauthorized components or parts.

  • Page 8: Installation And Test

    Insert the 4 caps (provided) into the hole. Lower Higher Keeping Turn clockwise to raise; counterclockwise to lower. LGE Intern Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 • Avoid connecting several electric devices, • Connect the power plug to the wall outlet. as doing so may cause a fire. LGE Internal Use Only 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. water by pulling out the hose cap. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Operation

    5. OPERATION 5-1. CONTROL PANEL FEATURES WM4370H*A LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 • Rotate the Cycle selector knob to select the cycle • Use this button to designed for different types of fabric and soil Start/Stop the washer. levels. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 • To change the soil level, press the Soil Level button repeatedly until the desired setting is on. • Press repeatedly to adjust the volume of the Signal. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 14: Cycle Guide

    - Do not overload the Bulky/Large cycle. If the washer does not function properly, manually redistribute the load or wash one item at a time. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 15: Special Functions

    NOTE: CHILD LOCK lasts after the end of cycle. If you want to deactivate this function, Press and hold the PRE WASH button for 3 seconds. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Explanation Of Each Process

    • If the eccentricity is good, the intermittent spin starts. • During this process, the drain pump works for drainage intermittently. LGE Internal Use Only 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. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 18: Test Mode

    6. TEST MODE 6-1. 6-2. SPIN SPEED SOIL LEVEL Turns on all lamps and locks the door. 6-3. WASH/RINSE DELAY WASH LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Troubleshooting

    7. TROUBLESHOOTING 7-1. 7-2. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 → It needs to be exchanged. NFC VERSION ※ nU is displayed only in the first screen of ERROR the Test Mode. LGE Internal Use Only 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 LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 DRAIN ERROR SPIN SPEED SOIL LEVEL, WASH/RINSE DELAY WASH LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 HEATING ERROR LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 (Red 3P, male ) - part of wir e Replace the Check the IPM in the MAIN PWB controller . ASSEMBLY. Motor Drive LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 Replace Does the spring of Latch than it should. Door Hook actuate? Assembly. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 UNBALANCE ERROR OVER FLOW ERROR WASH/RINSE DELAY WASH [Note] Installation check list LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 Fix the air Is the AIR CHAMBER and chamber the tube clogged? and remove the foreign material. Replace the MAIN PWB assembly. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 28: Troubleshooting Else

    Is the connector connected or repair to PCB/Noise filter the connector. disconnected or disassembled? Connecting connector MAIN PWB~ Display PWB LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 BUTTON DOESN’T WORK LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 (2) Liquid fabric Softener Compartment (3) Prewash Compartment (4) Main Wash Compartment Is the detergent caked or Clean the hardened? dispenser. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 (4) Main Wash Compartment Is the liquid detergent/ Clean the cap softener/bleach cap clogged? container. Bleach cap Softener Liquid detergent cap LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 33: Before Using The Tag On Function

    ] in the LG Smart Laundry&DW app for a more detailed guide on how to use the Tag On function. LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 34: Component Testing Information

    A SSE M BLY FUSE Test points Result Test Points Result WH (1) to RD (3) WH (3) to RD (1) LGE Internal Use Only Copyright © 2016 ~ 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 35: Door Look Switch Assembly

    – 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 LGE Internal Use Only reserved. Only training and service purposes.
  • Page 36 (3) to (4) 60-90 Ω At 77 °F °C (4) to (5) Infinity (2) to (4) 120 Vac Voltage Input Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 37: 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 LGE Internal Use Only reserved. Only training and service purposes.

  • Page 38: Pump Motor Assembly

    Drain Pump Circulation Pump Test Points Result Test Points Result (1) to (2) 10-20 Ω (1) to (2) 18-30 Ω Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 39: Inlet Valve Assembly

    8-5. INLET VALVE ASSEMBLY Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 40: Heater Assembly

    Wiring diagram diagram * Each circuits of loads in wiring diagram are all same. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only Fun ction The wash heater is designed to raise the wash water to the desired temperature reserved.

  • Page 41: Thermistor Assembly

    8-7. THERMISTOR ASSEMBLY Circuit in the MAIN PCB / Wiring Diagram Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 42 1.4 kΩ At 266°F (130°C) 1.0 kΩ At 293°F (145°C) 0.7 kΩ At 320°F (160°C) 0.4 kΩ At 356°F (180°C) Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 43: Disassembly Instructions

    8 Disassemble the display PWB assembly. 9 Disconnect the NFC connector. Disassemble the NFC PCB from the PCB assembly, display Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 44 Remove the protective cover. PROTECT COVER Disconnect the connectors. Unscrew 1 screw on the back. Remove the main PWB. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 45 Unscrew 2 screws from the back of the cabinet. NOISE FILTER Disassemble two (or three) connectors from the noise filter. Unscrew a screw from the top bracket. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 46 Unscrew the screw from the lower side of the cabinet cover. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 47 Lift and separate the cabinet cover. Disassemble the clamp assembly. Disassemble the gasket. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 48 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 LGE Internal Use Only reserved. Only training and service purposes.
  • Page 49 • Tighten the fastening nut so the heater is secure. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 50 Unscrew 2 screws on the back of the top plate. TOP PLATE ASSEMBLY Pull the top plate backward and upward as shown. Disconnect the connector. Disassemble the lamp assembly. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 51 If you pull the dampers apart, the must be replaced. If you do not separate them, they can be re-used. Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 52: Exploded View

    A101 A156 A141 *040 A390 A153 A151 A100 A131 A130 A430 A140 A133 A440 A300 A310 A201 A220 A200 A303 Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 53: Drum And Tub Assembly

    K512 K344 K135 K340 K131 F360 K105 K346 K349 F365 K520 K345 F461 K347 F145 K540 K550 F468 K342 K348 Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 54: Dispenser Assembly

    )E U F170 F160 F340 F227 F225 F226 F329 F430 F220 F441 F120 HOT (RED) A275 F130 COLD (BLUE) A276 F432 Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.

  • Page 55: Wiring Diagram

    11. Wiring Diagram Copyright © 2016 ~ 2017 LG Electronics Inc. All rights LGE Internal Use Only reserved. Only training and service purposes.
  • Page 56 P/No. : MFL67307921...

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