Daikin ZQG71~140L7V1B Service Manual page 130

Symptom-based Troubleshooting
Troubleshooting
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.
Does the
unit start operation after
3 minutes?
NO
Is the
discharge side of compressor hot
after unit stop?
YES
Check on the cause why overcurrent
relay (for compressor) or compressor
protection thermostat acted.
[Electric system]
Power supply
voltage is within ±10 % of
specified voltage.
YES
Is the size
of power cable through total
length correct?
YES
[Refrigerant circuit]
After vacuum drying, charge correct
amount of refrigerant. Then, start
operation again.
Is there
any temperature difference
between inlet and outlet of
electronic expansion
valve?
YES
Is there
any temperature difference
between suction side and
discharge side of four
way valve?
YES
Defective compressor
118
YES
NO Not so hot
NO
NO
NO
NO
Normal. Unit is in 3-min standby
mode.
Check the compressor.
Contact the power company.
Replace the power cable.
Defective electronic expansion
valve
Defective four way valve
Check the compressor.
Service Diagnosis
ESIE12-06