LG R410A Service Manual page 126

Self-diagnosis function
Display
Transmission error : fan PCB ➡ main
1 0 5
PCB
Over-current of fan motor (IPM fault)
1 0 6
Low voltage of fan motor driver
1 0 7
Transmission error : main PCB ➡ fan
1 0 8
PCB
Liquid pipe temperature sensor
1 1 3
Subcooling inlet temperature sensor
1 1 4
Subcooling outlet temperature sensor
1 1 5
Failure of operation mode conver-
1 5 1
sion
I Please refer to trouble shooting guide in service manual for each error title
CAUTION
In case that the control box is opened and before checking electrical parts, it should be checked that
the LED 01M (Refer to next page) turned off (wait 3 minutes after main power OFF), otherwise, it may
cause electrical shock.
126 Trouble Shooting Guide
Title
Failing to receive fan signal at main PCB
Over-current of fan motor (IPM fault)
Low voltage of fan motor driver
Failing to receive main signal at fan PCB
Liquid pipe temperature sensor is open or short
Subcooling inlet temperature sensor is open or short
Subcooling outlet temperature sensor is open or short
Pressure unbalance between outdoor units
Cause of Error