112
14
Is power supply voltage normal ?
Is the wiring connector
connection normal on the
inverter PC board ?
Is there a blockage in the heat
sink cooling duct ?
Check inverter PC board.
Check power supply.
Check fan and fan motor.
Remove blockage.
No
Yes
No
Yes
No
Yes
Is there a screw loose on the
IGBT module or heat sink on
inverter PC board ?
Tighten screws.
Yes
No
Is outdoor fan normal ?
Check the circuit wiring, for example wiring to the
inverter compressor or connector connection.
No
Yes
Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[dA] 1. Power supply failure
Abnormal overheat of heat sink 2. Outdoor fan error
3. Heat sink installation failure
4. Blockage of heat sink cooling duct
5. Defective inverter PC board
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