The Phenomena From Main Component Failure - LG MULTI V M ARNU07GTU 4 Series Svc Manual

1. The phenomena from main component failure

The phenomena from main component failure
Component Phenomenon
Not operating
Compressor
Stop during running
Abnormal noise
during running
High pressure error
Heat Exchanger
in cooling mode
Module fan
operation
Heating failure, fre-
quent defrosting
No operation sound
after switching ON
the power supply
MULTI V M
EEV Heating failure,
frozen outdoor heat
exchanger part
Low pressure error
or discharge temper-
ature error
When system fault occurs, the error code is displayed on the indoor unit display or remote control display. The
trouble shooting guide is available in the service manual.
• When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok.
The phenomena from main component failure
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 fan operation to confirm proper
motor functioning. Switch OFF the Heat
Exchanger Module and remove obstacles,
if any, around the HEX. Check connector
Check resistance between terminals
Service necessary
Service necessary
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