Communication Error Between Outdoor Units - LG multi V PLUS Service Manual

Fault diagnosis and Trouble shooting guide
Error
Error Item
Display No.
Communication error
between outdoor units
104
111
142
Trouble shooting Flow
Is connection status of the
communication line normal?
Is power of the outdoor unit
Check or replace the outdoor unit PCB
Meaning
Communication error
between outdoor units
(main outdoor unit -
sub outdoor unit)
Yes
applied?
Yes
Major Error Occurrence Cause
• No connection of communication line
• Short or fusing of communication line
• Poor outdoor unit PCB
• Power of outdoor unit is not applied
No
No
Check power line of the outdoor unit
Self-diagnosis function
Check or reconnect
communication lines
Service Manual 281