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
Summary of Contents for A90-0132
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