Communication Error (Inverter Pcb - Main Pcb) - LG multi V PLUS Service Manual

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