LG MULTI V M ARNU07GTU 4 Series Svc Manual page 34

Test Run
2. How to cope with Test Run abnormality
The phenomena from main component failure
Component Phenomenon
Not operating
Compressor
Stop during running
Abnormal noise
during running
High pressure error
at cooling
Heat Exchanger
Module fan
Heating failure, fre-
quent defrosting
No operating sound
at applying power
MULTI V M
Heating failure,
EEV
frozen outdoor heat
exchanger part
Low pressure error
or discharge temper-
ature error
When system fault occurs, the error code is displayed at indoor unit display or remote control display, the trou-
ble shooting guide is in the service manual
• When CH05/53 ERROR occurs, check if auto-addressing has done and communication wiring is ok.
Cause
Motor insulation broken
Strainer clogged
Oil leakage
Motor insulation failure
R-S-T misconnection
Motor failure,
bad ventilation around
outdoor heat exchanger
Bad connector contact
Coil failure
EEV clogged
EEV clogged
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Check method and Trouble shooting
Check resistance between terminals and
chassis
Change strainer
Check Oil level after opening oil port
Check resistance between terminals and
chassis
Check compressor R-S-T connection
Check the Heat Exchanger Module fan
operation after being turned the Heat
Exchanger Module off for some time.
Remove obstacles around the Heat
Exchanger Module
Check connector
Check resistance between terminals
Service necessary
Service necessary
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Only training and service purposes.