Table of Contents
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LG Room
Air Conditioner
SERVICE MANUAL
MODEL: LW1200PR
LW1200ER
LW1000PR
LW1000ER
LW1004ER
LWL1210WAL
LWL1230WAL
WM-1231
LW1000ERY3
LB1000ER
LB1200ER
LW100CS
LW120CS
LW1000PRY3
LW1200PRY3
LW1200ERY3
website http://www.lgservice.com
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
LG
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Table of Contents
Troubleshooting
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Summarization of Contents
Safety Precautions
Safety Symbols and Warnings
Explains warning and caution symbols indicating potential hazards.
Power Cord and Socket Safety
Safety guidelines for electrical connections and grounding during installation.
Handling and Storage Precautions
Precautions for unpacking, installation, and storage of the air conditioner unit.
Dimensions
Manual Symbol Definitions
Defines symbols used throughout the manual to alert users to specific information.
External Unit Dimensions
Provides diagrams and measurements for the external dimensions of the unit.
Installation
Location Selection Guidance
Guidelines for choosing an optimal location for unit installation to ensure performance.
Post-Installation Checks
Key checks to perform after the unit has been installed to ensure proper function.
Drain Pipe Installation
Step-by-step instructions for correctly attaching and securing the drain pipe.
Operation
Control Functions Overview
Explains the purpose and operation of various buttons and modes on the unit and remote.
Disassembly
Mechanical Component Removal
Procedures for disassembling major mechanical components like the grille, cabinet, and control box.
Control Box Access
Detailed steps for removing and accessing the control box and its internal components.
Refrigerating Cycle
Condenser and Evaporator Removal
Instructions for safely removing the condenser and evaporator units from the system.
Capillary Tube Servicing
Steps involved in removing the capillary tube, including refrigerant discharge precautions.
Schematic Diagram
Electronic Control Device Schematic
Detailed schematic of the electronic control board and its connections.
Wiring Diagram
Visual representation of the electrical connections and wiring paths within the unit.
Components Location
Main PCB Component Layout
Identifies the physical location of components on the main printed circuit board.
Display PCB Component Layout
Shows the layout and component placement on the display printed circuit board.
Troubleshooting Guide
Piping System Diagnostics
Explains the refrigeration cycle and component functions for diagnosing piping issues.
Poor Cooling Troubleshooting Flow
Provides a flowchart for diagnosing and resolving issues related to poor cooling performance.
Unit Failure to Start Diagnostics
Offers a diagnostic flowchart for addressing problems where the unit fails to start.
Electrical Component Troubleshooting
Guides users through diagnosing electrical component failures and unit operation issues.
Compressor Operational Faults
Specific troubleshooting steps for compressor-related problems like non-operation or constant operation.
Fan and Remote Control Issues
Diagnoses issues with the fan not operating or the remote controller malfunctioning.
PCB Assembly Fault Diagnosis
Addresses abnormal displays or operation issues related to the DC and AC PCB assemblies.
Motor and Compressor Faults
Troubleshoots fan motor and compressor issues, including noise, intermittent operation, and overload.
Cooling Efficiency and Noise Issues
Addresses insufficient cooling, excessive noise, and compressor overload causes.
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