                                                                          Installations                                                                      Domestic air conditioner11.4.8 Power Supply Over or under voltage faultElectrify the machine again and turn it on withthe remote controller. Check whether thecompressor is started normallyIs it ok?Yes Maybe there is some disturbanceNONo~230 is ok?YesYesThis question may be caused by the power. Repairthe power supply.NOChange the IPM moduleChange the IPM moduleTest the outdoor power supply(+310VDC) with a multimeter.check whether the poweris >150 V or <390V?Method ofmalfunction detectionMalfunction detectionconditionsTroubleshootingAn abnormal voltage rise or fall is detected by checking the specified voltage detectionAn voltage signal is fed from the voltage detection circuit to the microcomputerŶSupply voltage not as specified.ŶThe IPM module is broken.ŶThe outdoor PCB is broken.Supposed causes* CautionBe sure to turn off power switch before connect or disconnect connector, or elseparts damage may be occurred.LED1 flash 21 times The power supply is over voltageOutdoor diplay51

Haier AS09NS1HRA-GOLDEN Service Manual