LG Multi V CRUN Series Service Manual page 241

Fault diagnosis and Trouble shooting guide
Display
Title
code
Transmission
error from main
PCB in the
56
outdoor unit
to central
controller
Trouble shooting Flow
Is the PCB of central
controller normal?
Execute group
Is the state of
transmission in
outdoor unit normal?
Check and replace outdoor
Meaning
In the case that central
controller can not receive
any signal
from main PCB
successively for 3minutes
Yes
setting
Yes
Yes
unit PCB
Cause of error
• Group setting is not carried out
• Transmission connector unplugged
• Transmission cable misconnected / disconnection
• Malfunction of central controller circuit
• Malfunction of transmission circuit of indoor unit
• Distance between transmission cable and power
cable is not enough
No
No
No
Repair the
connection
Execute group
setting
Self-diagnosis function
Check and replace
indoor unit PCB
Service Manual 241