LG WM3997H A /01 Series 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 WM3997H A /01 Series Specifications

General

Capacity	4.3 cu. ft.
Energy Star Certified	Yes
Spin Speed	1300 RPM
Steam Technology	Yes
Smart Diagnosis	Yes
Width	27 inches
Height	39 inches
Stackable	No
Ventless Dryer	Yes
Color	White
Washer Type	Front Load
Voltage	120V
Frequency	60Hz
Type	Front Load Washer and Dryer Combo
Wash Programs	Delicates, Heavy Duty
Drying Programs	Delicates, Heavy Duty, Normal, Permanent Press, Speed Dry

Summary

Specifications

Features and Technical Explanation

Key Features

Details the key features like Ultra Capacity and Direct Drive System.

Neuro Fuzzy Washing Time Optimization

Explains the intelligent washing time optimization system based on load and temperature.

Water Level and Door Control

Describes water level control via pressure sensor and door lock/unlock mechanisms.

Door Opening Restrictions

Lists conditions under which the washing machine door cannot be opened.

Child Lock Functionality

Explains the function and operation of the child lock feature.

Steam Washing Features

Explains the steam washing function and its applications.

Parts Identification

Main Machine Parts

Identifies the main components of the washing machine shown in diagrams.

Included Accessories

Lists and illustrates the accessories provided with the appliance.

Installation and Test

Standard Installation Procedure

Outlines the steps for correctly installing the washing machine.

Hose and Power Connections

Details procedures for connecting inlet hoses, drain hose, and power plug.

Operation

Control Panel Features Overview

Explains the functions of each button and indicator on the control panel.

Wiring Diagram

Test Mode

Safety Cautions for Test Mode

Provides important safety precautions before entering test modes.

Load Test Mode Operation

Details the procedure and steps for performing the load test mode.

Water Level Frequency Check

Explains how to check water level frequency for diagnostics.

Troubleshooting

Safety Precautions

Important safety warnings to follow during troubleshooting procedures.

Error Mode Summary

Summarizes common error codes, symptoms, and their causes.

Fault Diagnosis Flowcharts

Provides step-by-step guides for diagnosing and resolving various faults.

Vibration and Noise Issues

Guides on how to troubleshoot and resolve vibration and noise issues during spin.

Water Supply and Detergent Flow

Troubleshooting steps for no water supply and detergent/softener flow problems.

Operational Issues (Heating, Drain, Sound)

Guides for heating, drain malfunctions, and abnormal sound diagnosis.

Spin and Error Display Issues

Troubleshooting for spin problems and interpreting error displays.

Dry Cycle Troubleshooting

Troubleshooting steps for dry heater, fan motor, and related issues.

Disassembly Instructions

Control Panel and Main PWB Disassembly

Steps to disassemble the control panel and main PWB assembly.

Dispenser, Noise Filter, and Door Assemblies Disassembly

Instructions for disassembling dispenser, noise filter, and door lock switch.

Cabinet Cover and Major Component Removal

Steps for removing the cabinet cover and components like pump, heater, thermistor.

Motor/Damper and Drum Area Access

Procedures for disassembling motor/damper and removing foreign objects from the drum.

Exploded Views

Cabinet & Control Panel Assembly Exploded View

Exploded view of the cabinet and control panel assembly.

Drum & Tub Assembly Exploded View

Exploded view of the drum and tub assembly.

Dispenser Assembly Exploded View

Exploded view of the detergent dispenser assembly.

Dry Duct Assembly Exploded View

Exploded view of the dry duct assembly.