LG Multi V CRUN Series Service Manual page 220

Self-diagnosis function
Error code 52, 53, 54, 56, 57 are applied only to CRUN1008T0
Display
CT sensor
4 0
Inverter compressor discharge pipe
4 1
sensor (discharge temperature)
4 2 Low pressure sensor
High pressure sensor
4 3
Outdoor air sensor
4 4
4 5 Outdoor unit pipe sensor
Suction pipe sensor
4 6
Normal compressor discharge
4 7
pipe
Outdoor unit pipe sensor
4 8
4 9 Voltage sensor
Indoor connection over(capacity)
5 1
Transmission error from inverter
PCB to main PCB in the outdoor
5 2
unit
Transmission error from indoor
unit to main PCB in the outdoor
5 3
unit
Reverse connection of the R,S,T
5 4
power line
Transmission error from central
control to main PCB in the outdoor
5 5
unit
Transmission error from main
PCB in the outdoor unit to central
5 6
control
Transmission error from main PCB
5 7
to inverter PCB in the outdoor unit
Please refer to trouble shooting guide in service manual for each error title
In case that the control box is opened and before checking electrical parts, it should
Caution
be checked that the LED 01Y (Refer to next page) turned off (wait 3 minutes after
main power OFF), otherwise it may cause electrical shock.
220 Trouble Shooting Guide
Title
CT sensor open or short
Inverter compressor dischare pipe sensor open or
short
Low pressure sensor open or short
High pressure sensor open or short
Outdoor unit air sensor open or short
Outdoor unit pipe sensor(left) open or short
Duction pipe sensor open or short
Normal compressor discharge pipe sensor open or
short
Outdoor unit pipe sensor (right) open or short
Voltage sensor open or short
The displayed number of indoor units being connected
is over rated capacity of outdoor unit
In the case that main PCB can not receive any signal
from inverter PCB successively for 20 seconds
In the case that main PCB can not receive any signal-
from indoor unit successively for 3minutes
Misconnection or disconnection of R,S,T power line
In the case that main PCB can not receive any signal
from central control successively for 3minutes
In the case that central control can not receive any
signal from main PCB successively for 3minutes
In the case that inverter PCB can not receive any sig-
nal from main PCB successively for 20 seconds
Cause of Error