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    Three reasons why air conditioners do not heat

    Release time: 2017-06-16
    Failure of refrigeration cycle system and control system 1. Insufficient refrigerant. A simple self-test can be performed to determine if there is a fluorine leak. 2. Four-way valve string air. The heat pump type air conditioner switches the cooling and heating states through a four-way valve. Some of the refrigerants that should be involved in heat exchange are returned directly from the compressor outlet pipe to the return pipe at the four-way valve, resulting in a decrease in the refrigerants involved in heat exchange and a decrease in heat exchange efficiency, which causes insufficient heating capacity. 3. Check valve (also known as check valve) leaks air. The pressure difference between high and low pressure of the refrigeration system decreases, the temperature of the outdoor heat exchanger rises, and the heat obtained from the outside world decreases, resulting in insufficient heating capacity. If you check the pressure when the system is running, you will find that the pressure on the low side rises and the difference between high and low pressure drops. 4. The defrost controller has failed. If the air conditioner cannot be turned into the defrosting operation state in time, the frost phenomenon of the evaporator will occur during the heating of the heat pump, which will affect the heat exchange efficiency of the air conditioning heating, resulting in insufficient heating capacity or even shutdown. Should focus on observing whether the defrosting temperature sensing device is misplaced, the contact is sticky or bad, the fan impeller slips or the air duct is blocked, and the solenoid valve or start relay is invalid. 5. The auxiliary electric heating function fails. If the electric auxiliary heating control circuit or electric auxiliary heating equipment fails and cannot work normally, when the ambient temperature is relatively low, it will lead to insufficient heating of the air conditioner, and even when the environment is harsh, the air conditioner will not heat at all. 6. For heat pump-assisted electric heating air conditioners, if the ambient temperature is high (above 5 ° C) and the heating is normal, and the ambient temperature is low (below 0 ° C), the heating is insufficient or no heating, you should suspect the electric auxiliary heating Control power

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