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Service Manual
(9) Other Malfunction
1.IPM module temperature sensor is open-circuited (P7)
Hardware of main board is damaged. Please replace main board.
2.Overheating protection of IPM module (P8)
① Poor radiation because the module radiator is dirty;
② IPM module is damaged;
③ Malfunction of outdoor fan, etc;
3.Detection circuit malfunctions of phase-current of compressor (U1)
Hardware of main board is damaged. Please replace main board.
4.DC busbar voltage is too high (PH)
① Input voltage is too high or unstable;
② Hardware of main board is damaged;
5.DC busbar voltage is too low (PL)
① Input voltage is too low or unstable;
② Hardware of main board is damaged;
6.Malfunction of ODU DC fan (L3)
① The wire terminal of outdoor fan motor is loosed, fix the terminal.
② Motor damaged, replace the motor.
③ Fan motor module on mainboard is damaged, replace the main board AP1
Installation and Maintenance
62
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Troubleshooting
