LG ACHH Series Manual page 102

Error code check
4 Way Valve
Start inspection
After 3 minutes from the
starting, is the difference of high pressure and
low pressure 4 atmosphere
or more?
Yes
There is no problem with 4way valve
No
Does compressor operate normally?
Is PCB connector correctly connected?
Is voltage applied normally from PCB?
Start again
After 3 minutes
from the starting, is the difference
of high pressure and low pressure
4 atmosphere or more?
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No
Yes
No
Yes
No
Yes
Solve the
compressor
problem
Connect the
connector again
Replace PCB
Check and replace
4way valve coil