Dehumidification effect becomes poor, even can not dehumidification.

　　Check the faults: (1) Check the evaporator and find that there is no condensed water on the surface of the evaporator; (2) Touch the high-pressure tube by hand, only warm (normal should feel hot) can be judged as refrigerant leakage; (3) Check the refrigeration pipe system, and find that there is oil trace (leakage point) at the interface between the high pressure pipe and the condenser, which is caused by strong vibration.

　　Maintenance methods: (1) with oil trace method (or soap foaming method) to find out the crack, leakage repair; (2) Pressure leak detection, vacuum, reperfusion refrigerant; (3) Find the cause of severe mechanical vibration after power-on, and find that the unloading device cannot work, which is caused by the fault of electromagnetic directional valve. (4) After replacing the solenoid directional valve of the same model, re-detect the leakage, vacuum, fill the prescribed amount of refrigerant, and then start the machine, and troubleshoot the fault.

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