LG ARUN Series Service Manual page 110

Troubleshooting Guide
Error
Error Type
No.
Wrong connection of 3Ø
54*
power supply cable
Master 541
(Reverse direction / missing
Slave 542
a phase)
I Error diagnosis and countermeasure flow chart
Is connection and phase
order of power cables to main /
slave outdoor unit correct?*
Yes
Is connection and phase
order of power distribution
panel correct?**
Yes
Is CH 54 occurred again
after reset MAIN
circuit breaker?
Yes
Is main PCB fuse normal?
Yes
Replace main PCB
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Error Point
Wrong connection of 3Ø
power supply cable
(Reverse direction / miss-
ing a phase)
No
Connect correctly
No
Connect power cables in
distribution panel correctly
No
End
No
Replace Fuse
- 110 -
Main Reasons
1. Main PCB defect
2. No power of R,S,T supplied
3. Wring connection of R,S,T cables
4. Main Pcb Fuse failure
LGE Internal Use Only