LG multi V PLUS

Service Manual 277
Self-diagnosis function
Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
52
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
Communication error
(inverter PCB - main
PCB)
If failing to receive
inverter signal at main
PCB
• No connection of communication line
• Short or fusing of communication line
• Poor inverter PCB or main PCB
No
Check and connect the
communication line
Yes
Is connection of the
communication line between the inverter
PCB and the main
PCB normal?
No
Check or replace the main PCB
Yes
Is the main PCB normal?
Check or replace the inverter PCB.