LG Multi V CRUN Series Service Manual page 238

Self-diagnosis function
Fault diagnosis and Trouble shooting guide
Display
Title
code
Transmission
error from
indoor unit to
53
main PCB in
the outdoor
unit
Trouble shooting Flow
238 Trouble Shooting Guide
Meaning
In the case that main PCB
can not receive any signal
from indoor unit
successively for 3minutes
Is the transmission
line connection /
Connector normal?
Yes
Is the transmission
circuit of main PCB
normal?
Yes
Check and replace the
inverter PCB
Cause of error
• The connector for transmission disconnected
• The transmission line is misconnected or shorted
• Transmission circuit of main PCB is abnormal
• Transmission circuit of indoor unit PCB is
abnormal
No
Repair the connection /
connector
No
Check and Replace the
main PCB