Analysis of series functional faults: 1. The compressor and fan cannot operate normally. The main reasons for its failure, in addition to power loss, include: low power supply voltage, difficulty in starting the motor, causing the thermal protector to trip and cut off the power circuit; Internal disconnection of electrical control circuits and internal damage and poor contact of various selection switches. 2. The air conditioner starts/stops frequently during operation. The main reasons for this fault are: (1) the installation position of the temperature sensor of the temperature controller is too close to the evaporator; (2) The bimetallic contact of the overload protector is poor, causing the power supply circuit to be disconnected and disconnected; (3) The power supply voltage is low and unstable. 3. The electrically heated air conditioner does not generate heat. The main reason for this is the burning of the heating wire; The heating protector trips or the fuse is blown, and the contact of the AC contactor controlling the electric heater is poor. 4. The heat pump air conditioner does not cool. The main causes of the malfunction are: (1) the solenoid coil of the solenoid valve is burnt or damaged; (2) The valve core inside the solenoid valve is stuck or damaged; (3) The reversing valve cannot be reversed, mainly because the refrigerant is not clean and the piston is blocked; (4) Due to prolonged use
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