Is operation noise
heard when applying solenoid
valve power?
Start of check.
Replace coils.
Liquid Injection Valve.
No failure of liquid injection valve.
No
Replace the valve.
No
Yes
Is temperature
different between both ends of the valve when
the compressor discharge temperature
is normal?
No
Is the connector on the PCB board
normally connected?
Start of check
Reconnect the connector
on the PCB board
Replace the fan motor.
Constant Speed Outdoor Unit Fan
No failure of the fan motor of
constant speed outdoor unit
No
No
Yes
Yes
Does the fan operate in
load condition of more than 30%
heating operation?
Does the fan operate
in load condition of more than
30% cooling
operation?
No
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