Fan motor work show that the power supply is normal, normal temperature controller is normal. Key check compressor, starting capacitors and overload protector. Sub will overload protector when the power is cut off contact with wires, electricity of commissioning of the compressor is still not started, but the "buzzing" sound compressor motor, that has a compressor cylinder card phenomenon or improper startup capacitor. Power after remove the start capacitor C1, measuring the capacitance has been broken down, with the same specification change type capacitor, and disable overload protector on electricity of commissioning after short wires, compressor startup to normal.AU3service manual download site