Symptom-based Troubleshooting
SiBE281013
90
Service Diagnosis
Troubleshooting
[Electric system]
[Refrigerant circuit]
Not so hot
Normal. Unit is in 3-min standby
mode.
YES
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Turn the operation switch ON and
OFF, then wait at ON side.
Check on the cause why overcurrent
relay (for compressor) or compressor
protection thermostat acted.
NO
Check the compressor.
NO
YES
Contact the power company.
NO
YES
Replace the power cable.
NO
YES
After vacuum drying, charge correct
amount of refrigerant. Then, start
operation again.
Defective electronic expansion
valve
NO
YES
Defective four way valve
NO
YES
Check the compressor.
Defective compressor
Does the
unit start operation after
3 minutes?
Is the
discharge side of compressor hot
after unit stop?
Power supply
voltage is within ±10 % of
specified voltage.
Is the size
of power cable through total
length correct?
Is there
any temperature difference
between inlet and outlet of
electronic expansion
valve?
Is there
any temperature difference
between suction side and
discharge side of four
way valve?
