Service manual

97
14
Troubleshooting
Diagnostic Procedure for Check Code
Check code Operation cause
1. Power supply failure
[dA]
2. Outdoor fan error
Abnormal overheat of heat sink
3. Heat sink installation failure
4. Blockage of heat sink cooling duct
5. Defective inverter P.C. board
Is power supply voltage normal?
Is the wiring connector
connection normal on the
inverter P.C. board?
Check power supply.
Tighten screws.
Check the circuit wiring, for
example wiring to the inverter
compressor or connector connection.
No
Yes
No
Yes
Is there a screw loose on
the IGBT module or heat sink
on inverter P.C. board?
Yes
No
Check inverter P.C. board.
Remove blockage.
Is there a blockage in the
heat sink cooling duct?
Yes
No
Check fan and fan motor.
Is outdoor fan normal?
No
Yes