LG ARUV Series Service Manual page 255

Error
Error Type
No.
22 Over current of inverter
compressor
Error diagnosis and countermeasure flow chart
Are the resistance between
each phase and insulation resistance
of Inverter compressor normal ?
[refer electric component part]
Yes
Is fuse normal?
[refer electric component part]
Yes
Is noise filter normal?
[refer electric component part]
Yes
Is input voltage of power
supply normal? (Over 360V)
[refer electric component part]
Yes
Check whether the current
measured at the R phase line passing
through CT during operation is
above 18A after reset?*
Yes
DC Link voltage is more
than 460 V?
[refer electric component part]
Yes
Check over charging of refrigerant or
whether the filter is blocked of indoor
unit (heating) / outdoor (cooling) or not
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Only for training and service purposes
Error Point
The current flowing at the
CT sensing circuit is more
than the allowable maxi-
mum value of the current
during cooling mode
No
Replace INV COMP
No
Replace FUSE
No
Replace Noise Filter
No
Check input voltage & adjust
Is it working normally
No
with 5~15A of CT current ?
Is CH 22 occurred?
Yes
Replace inverter compressor PCB
Capacitor/ 3phase Diode
No
check & replace
[refer electric component part]
* measure the current passing
through CT by clamp meter
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Troubleshooting Guide
Main Reasons
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
No
LGE Internal Use Only