LG ATNH09GRLE2 Svc Manual page 74

6.7 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IPM Fault)
Items for
checking
Checking
power source
Check-
ing for
over-load
operation
Checking
compressor
Checking
PCBA
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Checking
Checking
input
connection
voltage
Checking Checking
outdoor outdoor
devices for fan operating
shielding condition
Checking
Checking
refrigerant
sensor fault
for over/short
Checking
Checking
Compressor
Compressor
wiring
resistance
Checking
Checking
IPM
connection
unit of IPM
state
- 74 -
Sub-items for
checking
power
state
Checking
pipes
For bending /
blocking
Checking
4-way valve
Checking
compressor
phase Insulation
resistance
Checking
Compressor
single
current
detection circuit
4. Trouble Shooting
Checking EEV
for motion
Checking DC
link voltage
LGE Internal Use Only