Troubleshooting Guide
- 270 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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1. Defect of inverter PCB
2. No power of R, S, T supplied
3. Wrong connection of R, S, T cables
4. Main fuse failure
Error
No.
Error Type Error Point Main Reasons
Wrong connection of 3Ø
power supply cable
(Reverse direction / miss-
ing a phase)
Wrong connection of 3Ø
power supply cable
(Reverse direction / missing
a phase)
54 (Main)
110 (Sub1)
141 (Sub2)
155 (Sub3)
■ Error diagnosis and countermeasure flow chart
Yes
Is 3Ø Fuse normal?
[refer electric
component part]
No
Replace Fuse
Is CH 54 occurred again
after reset MAIN
circuit breaker?
No
End
Check the diode of inverter
fan PCB and in case of fault
replace inverter fan PCB
[refer electric component part]
Is noise filter
normal?
[refer electric
component part]
No
Replace NOISE FILTER
Yes
Is connection and phase
order of power cables to main /
sub outdoor unit correct?*
No
Connect correctly
Is connection and phase
order of power distribution
panel correct?**
No
Connect power cables in
distribution panel correctly
Yes
Yes
Yes
Replace inverter compressor
PCB(CH54),
SUB PCB(CH110,141,155)
* Check power cable connection state,
phase (R-S-T) order, power supply state
in control box of product
** Check power cable connection state, phase order, power
supply state in distribution panel
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