Troubleshooting Guide
- 255 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
22
Over current of inverter
compressor
Error
No.
Error Type
Error Point
Main Reasons
The current flowing at the
CT sensing circuit is more
than the allowable maxi-
mum value of the current
during cooling mode
1. Compressor damage
2. Current sensing sensor (CT) damage
3. Low input voltage
4. Compressor terminal is disconnected or loose
5. Abnormality at the outdoor / indoor unit fan
7. Cover or clogging(Outdoor unit covering dur-
ing cooling mode/ Filter clogged at the indoor
during heating mode )
8. Defective inverter PCB/IPM PCB
■
Error diagnosis and countermeasure flow chart
Check whether the current
measured at the R phase line passing
through CT during operation is
above 18A after reset?*
Yes
Replace inverter compressor PCB
Check over charging of refrigerant or
whether the filter is blocked of indoor
unit (heating) / outdoor (cooling) or not
Is input voltage of power
supply normal? (Over 360V)
[refer electric component part]
Is fuse normal?
[refer electric component part]
Yes
Is noise filter normal?
[refer electric component part]
Yes
Are the resistance between
each phase and insulation resistance
of Inverter compressor normal ?
[refer electric component part]
No
Replace INV COMP
Yes
No
Replace FUSE
No
Replace Noise Filter
No
Check input voltage & adjust
Yes
Is it working normally
with 5~15A of CT current ?
Is CH 22 occurred?
No
Yes
No
DC Link voltage is more
than 460 V?
[refer electric component part]
Yes
No
Capacitor/ 3phase Diode
check & replace
[refer electric component part]
* measure the current passing
through CT by clamp meter
Summary of Contents for ARNU07GB1G1
Page 338: ...P NO 3828A24006P FEBRUARY 2009 ...
