LG Universal System Air Conditioner Service Manual page 103

14) Troubleshooting CH54
Display
Title
code
3-phase wrong wiring
54
of main outdoor unit
Check Point
1. Check the connection condition of R,S,T wire.
2. Check the connection condition of CN_Phase.
3. Check the outdoor main fuse.
Cause of error
• 3-phase wrong wiring of
outdoor unit (Reverse
Phase /omission of
phase)
Troubleshooting Guide
Check point & Normal condition
• Abnormal Main PCB
• No connection of CN_Phase
• Changed R, S, T connection order
Service Manual 103