**Model KFR-50LW/BP Haier Inverter Split Air Conditioner: The outdoor unit does not work.**
**Fault Symptoms:** After powering on, the indoor unit starts and operates normally, but there is no response from the outdoor unit.
**Analysis and Inspection:** Upon disassembling and inspecting the unit, it was found that the DC280V indicator light was not illuminated, while the AC220V measurement was normal. Touching the PTC revealed it was heating up, indicating a fault in the circuit after the rectifier. Further inspection showed that the IPM resistance value was normal, but the switching transistor Q02 was found to be damaged due to breakdown.
**Repair Method:** After replacing the transistor Q02 with one of the same specification, the fault was resolved.
**Source:** Beijing Haier Air Conditioning Repair Center