3-Phase Wrong Wiring - LG multi V PLUS Service Manual

Fault diagnosis and Trouble shooting guide
Error
Error Item
Display No.

54: 3-phase wrong wiring

of main outdoor unit
54
110: 3-phase wrong
110
wiring of Sub1
141
outdoor unit
141: 3-phase wrong
wiring of Sub2
outdoor unit
Trouble shooting Flow
Is R.S.T power connection
status normal?
Is fuse normal?
Is operation status normal?
Check or replace the inverter PCB.
Meaning
3-phase wrong wiring
of outdoor unit
(Reverse
phase/omission of
phase)
No
Yes
No
Yes
No
Yes
Self-diagnosis function
Major Error Occurrence Cause
• Abnormal inverter PCB
• No connection of R, S, T power
• Changed R, S, T connection order
Check or reconnect power lines
Check or replace fuse
Check or replace the main PCB
Service Manual 279