- 50 -
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.
Self-diagnosis function
Display
Title
Cause of Error
MUL
TI V M related error
3 2
Compressor Module Inverter Compressor1
High Discharge Temperature
Compressor Module Inverter Compressor1 High Discharge
Temperature
3 4
High Pressure of Compressor Module
High Pressure of Compressor Module
3 5
Low Pressure of Compressor Module
Low Pressure of Compressor Module
3 6
Compressor Module Low Compression
Ratio Limited
Compressor Module Low Compression Ratio Limited
4 0
Compressor Module Inverter Compressor
CT Sensor Fault
Compressor Module Inverter Compressor CT Sensor open
or short
4 1
Compressor Module Inverter
Compressor1 Discharge Temperature
Sensor Fault
Compressor Module Inverter Compressor Discharge
Temperature Sensor open or short
4 2
Compressor Module Low Pressure
Sensor Fault
Compressor Module Low Pressure Sensor open or short
4 3
Compressor Module High Pressure
Sensor Fault
Compressor Module High Pressure Sensor open or short
4 4
Heat Exchanger Module Air Temperature
Sensor Fault
Heat Exchanger Module Air Temperature Sensor open or
short
4 5
Heat Exchanger Module Heat Exchanger
Temperature Sensor (Front side) Fault
Heat Exchanger Module Heat Exchanger Temperature
Sensor(Front side) open or short
4 6
Compressor Module Suction Temperature
Sensor Fault
Compressor Module Suction Temperature Sensor open or
short
5 0
Omitting connection of R, S, T power of
Compressor Module
Omitting connection of Compressor Module
5 1
Excessive capacity of indoor units
Excessive connection of indoor units compared to capacity
of Compressor Module
5 2
Communication error : inverter PCB
→
Main PCB
Failing to receive inverter signal at main PCB of
Compressor Module
5 3
Communication error : indoor unit
→
Main
PCB of Compressor Module
Failing to receive indoor unit signal at main PCB of
Compressor Module .
5 7
Communication error : Main PCB
→
inverter PCB
Failing to receive signal main PCB at inverter PCB of
Compressor Module
6 0
Inverter PCB EEPROM Error of
Compressor Module
Access Error of Inverter PCB of Compressor Module
6 2
Compressor Module Inverter Heatsink
High Temperature
System is turned off by Compressor Module Inverter
Heatsink High Temperature
6 5
Compressor Module Inverter Heatsink
Temperature Sensor Fault
Compressor Module Inverter Heatsink Temperature Sensor
open or short
6 7
Heat Exchanger Module Fan Lock
Restriction of Heat Exchanger Module
7 1
Converter CT Sensor Error of
Compressor Module
Converter CT Sensor Error of Compressor Module
8 6
Compressor Module Main PCB EEPROM
Error
Communication Fail Between Compressor Module Main
MICOM and EEPROM or omitting EEPROM
