Article Source: Beijing Haier Air Conditioning Maintenance Center, http://blog.163.com/haierktiao_2012/.
Fault Symptoms: The indoor unit can start and run normally, but the outdoor compressor stops immediately after starting, while the fan operates normally.
Analysis and Inspection: The fact that the compressor can start indicates that the software is basically normal. It is judged that there might be a fault in the protection circuit or sensor circuit. First, the sensor was checked and found to be normal. After disconnecting the power, the resistor R30 (51kΩ/1w) in the circuit was checked, and it was found to be open-circuited, causing the CPU to mistakenly recognize an excessively low voltage and thus trigger the protection shutdown.
Repair Method: After replacing the resistor R30, the fault was eliminated.
Haier Air Conditioner (Inverter Split Type), the outdoor compressor does not operate.