LG R410A Service Manual page 125

Display
Current sensor of inverter compressor
4 0
Discharge temperature sensor of
4 1
inverter compressor A
Low pressure sensor
4 2
High pressure sensor
4 3
Air temperature sensor
4 4
Temperature sensor of Upper-part
4 5
heat exchanger
Suction temperature sensor of main
4 6
outdoor unit
Discharge tempeature sensor of
4 7
inverter compressor B
Temperature sensor of Lower-part
4
8
heat exchanger
Outdoor voltage sensing error
4 9
Excessive capacity of indoor units
5 1
Transmission error : inverter PCB ➡
5 2
main PCB
Transmission error : indoor unit ➡
5 3
main PCB of outdoor unit
Reverse connection of R, S, T power
5 4
of main outdoor unit
Transmission error : main PCB ➡
5 7
inverter PCB
Overheat of inverter heatsink
6 2
Temperature sensor of heatsink
6 5
Title
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
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
Self-diagnosis function
Cause of Error
Service Manual 125