LG R410A - Page 125

Service Manual 125
Self-diagnosis function
Current sensor of inverter compressor is open or short
Discharge temperature sensor of inverter compressor A is
open or short
Low pressure sensor is open or short
High pressure sensor is open or short
Air temperature sensor is open or short
Temperature sensor of Upper-part heat exchanger is open
or short
Suction temperature sensor of main outdoor unit is open or
short
Discharge temperature sensor of inverter compressor B is
open or short.
Temperature sensor of Lower-part heat exchanger is open or
short
1. Abnormal input voltage
2. Outdoor line fuse damage
3. Defective outdoor main PCB
Current sensor of inverter compressor
Discharge temperature sensor of
inverter compressor A
Low pressure sensor
High pressure sensor
Air temperature sensor
Temperature sensor of Upper-part
heat exchanger
Suction temperature sensor of main
outdoor unit
Discharge tempeature sensor of
inverter compressor B
Temperature sensor of Lower-part
heat exchanger
Outdoor voltage sensing error
Display Title Cause of Error
4
4
4
4
4
4
4
4
4
4
0
1
2
3
4
5
6
7
8
9
5
5
5
5
5
6
6
1
2
3
4
7
2
5
Excessive connection of indoor units compared to capacity of
outdoor unit
Failing to receive inverter signal at main PCB
Failing to receive indoor unit signal at main PCB of outdoor
unit
Reverse connection or omitting connection of R, S, T power
of main outdoor unit
Failing to receive main PCB signal at inverter PCB
Overheat of inverter heatsink
Temperature sensor of heatsink is open or short
Excessive capacity of indoor units
Transmission error : inverter PCB ➡
main PCB
Transmission error : indoor unit ➡
main PCB of outdoor unit
Reverse connection of R, S, T power
of main outdoor unit
Transmission error : main PCB ➡
inverter PCB
Overheat of inverter heatsink
Temperature sensor of heatsink
Outdoor unit related errorTransmission related error
Outdoor unit
related error