LG CQ12 NA0 - Page 76

- 76 -
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. Trouble Shooting
Cause of
Trouble
Condition Mechanism of Fault Generation
Generation
of refrigerant
flow distur-
bance
Bending/Blocking of a pipe
EEV fault Closing of SVC Valve
Freezing of indoor device
⳨ Reduced evaporation temperature due to
excessive expansion of refrigerant.
Weak heating and cooling
⳨ Insufficient flow of refrigerant
Frequent turning on/off of the compressor by
the high/low pressure protection logic
⳨ Accumulated refrigerant elevates the tem-
perature and reduces the pressure.
Wrong oil collection elevates the outlet tem-
perature of the compressor and damages the
compressor.
⶯ Bending/Blocking of a pipe ⶯ Checking SVC Valve
Bending of a pipe
OPEN
Check pipes
SVC Valve
Check
EEV Check
Replacing a part of or
the entire pipes
SVC Valve Full Open
Replacing EEV
Ⲽ&&7$IFDLJOH.FUIPE
$IFDLUIFPQFOJOHDMPTJOH
TPVOEPG&&7XIFOUIFQPXFS
JTBQQMJFEGPSUIFGJSTUUJNF
(FOFSBUJPOPGSFGSJHFSBOUGMPXEJTUVSCBODF
6.7 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IPM Fault)