LG WM3997HWA User Manual

WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL :WM3997H*A /01
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.

LG WM3997HWA Specifications

General

Spin Speed	1300 RPM
Color	White
Energy Star Certified	Yes
Steam Function	Yes
Stackable	No
Ventless Dryer	Yes
Washer Type	Front Load
Number of Wash Cycles	14
Wi-Fi Enabled	Yes
Capacity	4.5 cu. ft.

Summary

1. Specifications

2. Features & Technical Explanation

2-1. Key Features

Overview of primary washing machine features like Ultra Capacity and Direct Drive.

2-2. Washing Optimization Systems

Explanation of Neuro Fuzzy logic, water level, and door control systems.

2-3. Operational Controls & Functions

Details on door operation, child lock, water circulation, and steam functions.

3. Parts Identification

Parts and Accessories

Identification of major internal parts and included accessories.

4. Installation & Test

Standard Installation

Step-by-step guide for the standard installation of the washing machine.

5. Operation

5-1 Control Panel Features

Overview of the washing machine's control panel layout and functions.

6. Wiring Diagram

7. Test Mode

7-1. Safety Caution

Important safety precautions to follow when working with test modes.

7-2. Load Test Mode

Procedure for entering and executing the load test mode.

7-3. Water Level Frequency Check

Method to check water level frequency during test modes.

8. Troubleshooting

8-1. Safety Caution

Safety warnings related to troubleshooting procedures.

8-2. Error Mode Summary

Summary of error codes, symptoms, and their probable causes.

8-3. Fault Diagnosis Flowchart

Flowchart for diagnosing and troubleshooting common faults.

Vibration & Noise in Spin

Steps to diagnose and resolve vibration and noise during the spin cycle.

No Water Supply

Troubleshooting guide for issues related to no water supply to the machine.

Detergent Does Not Flow In

Guide for diagnosing why detergent is not entering the machine correctly.

Abnormal Sound

Steps to identify and resolve unusual sounds coming from the washing machine.

Heating Without Water

Diagnosing heating malfunctions when there is no water supply.

Heating Continuously Above Setting Water Temperature

Diagnosing and fixing continuous heating above the selected water temperature.

Drain Malfunction

Troubleshooting steps for problems related to the drain pump and hose.

Spin Trouble

Guide for diagnosing and resolving issues related to the spin cycle.

Error Display

Understanding error codes and specific checks for dry system components.

Dry Heater Trouble

Steps to diagnose and resolve issues with the dry heater and related components.

9. Disassembly Instructions

Control Panel Assembly

Step-by-step guide to disassembling the control panel and display PWB.

Main PWB Assembly

Procedure for removing and replacing the main PWB assembly.

Dispenser Assembly

Detailed steps for disassembling the detergent dispenser and its components.

Noise Filter

Instructions for disassembling and accessing the noise filter.

Door

Steps for opening and disassembling the washing machine door.

Door Lock Switch Assembly

Procedure for disassembling the door lock switch assembly.

Cabinet Cover

Guide to removing and replacing the main cabinet cover.

Pump

Steps for disassembling the water pump and related hoses.

Heater

Instructions for disassembling and replacing the heating element.

Thermistor

Procedure for disassembling and accessing the thermistor.

Foreign Objects in Drum/Tub

Guide for removing foreign objects lodged between the drum and tub.

Lamp Assembly

Steps for disassembling and replacing the internal lamp assembly.

Motor/Damper Assembly

Procedure for disassembling the motor and damper components.

8. Exploded View

8-1. Cabinet & Control Panel Assembly

Exploded view of the cabinet and control panel components.

8-2. Drum & Tub Assembly

Exploded view of the drum, tub, and related internal parts.

8-3. Dispenser Assembly

Exploded view of the detergent dispenser and its associated parts.

8-4. Dry Duct Assembly

Exploded view of the dry duct assembly and airflow components.