What is the reason why air conditioning and heating don't start in winter?

Analysis on the causes of non-start of air conditioning heating;

1, improper use

After using the air conditioner for a period of time, the filter screen accumulated too much dust, and the air outlets of the internal and external machines were blocked by foreign objects. If the accumulated dust is not cleaned up in time, the air circulation will be blocked, resulting in a decrease in the air output at the air outlet. Because the heating capacity in the machine cannot be taken away by the flowing air in time, the heating capacity is insufficient. This is not a fault, but a maintenance problem of the air conditioner.

2. Insufficient refrigerant

Due to the leakage of the refrigeration system, the refrigerant involved in the thermal cycle in the system is insufficient, which leads to the decrease of heat exchange efficiency, resulting in insufficient heating capacity.

3. Four-way valve

The heat pump air conditioner switches the cooling and heating states through a four-way valve. If the four-way valve is a part of a series of air and refrigerant, it will participate in heat exchange and directly return to the four-way valve from the compressor outlet pipeline, which will reduce the heat exchange of refrigerant and reduce the heat exchange efficiency, resulting in insufficient heat.

4, defrost controller failure

The heating state of the evaporator of the heat pump air conditioner is located in the outdoor unit. If the frost controller of frost heat pump air conditioner with hot air defrosting device fails, it will frost in the running state of air conditioner, the evaporator heated by heat pump will frost, and the heat exchange efficiency of air conditioner will lead to insufficient heat or even shutdown.

5. The auxiliary electric heating function fails.

If the electric auxiliary heating control circuit or electric auxiliary heating equipment can't work normally, when the ambient temperature is relatively low, it will lead to insufficient heating of the air conditioner, or even no heating at all when the environment is bad.