LG CT12 NR2 - User Manual

Air Conditioner
SVC MANUAL(General)
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Internal Use Only
http://biz.lgservice.com

LG CT12 NR2 Specifications

General

Brand	LG
Model	CT12 NR2
Category	Air Conditioner
Language	English

Summary

Part 3 Basic Control

Part 4 Trouble Shooting

Self-diagnosis Function

Explains the self-diagnosis system and error indicators.

Pump Down

Evacuation

Gas Charging

Electronic Parts

Troubleshooting Indoor Error

Lists specific indoor unit error codes and their causes.

Troubleshooting Outdoor Error

Comprehensive guide to outdoor unit error codes and diagnostics.

EEV Check

DC Link Detection Circuit

CH 22 (Input of Over Current)

Troubleshooting steps for over current in the unit.

CH 23 (DC Link Voltage Low)

Diagnosis for low DC link voltage errors.

CH 26 (Compressor Starting Failure)

Steps to address compressor starting issues.

CH 27;73 (PSC;PFC Fault Error)

Troubleshooting for PSC/PFC fault errors.

CH 29 (Compressor Over Current)

Steps to resolve compressor over current faults.

CH 32 (Discharge pipe overheating error of Inverter)

Diagnosis for discharge pipe overheating in inverter units.

Cause of Temperature Sensor Error

Sensor Checking Methods

Pressure sensor

CH 51 (Indoor Device Connection Error)

Addresses errors related to indoor device connection.

CH 52 (PCB Communication Error)

Troubleshooting PCB communication issues.

CH 05;53 (Indoor;Outdoor Device Communication Error) → Detection by indoor devices

Diagnosing communication errors between indoor and outdoor units.

CH 54 (Open and Reverse Phase Error)

CH 60 (EEPROM Fault)

CH 61 (Condenser High Error)

CH 62 (Heat sink High Error)

CH 65 (Heat sink Temperature Sensor Open;Short)

CH67 Cause of Generation