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Installation and Maintenance
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
