China Naming Network - Eight-character lottery - Why is it that when Midea's air conditioner is turned on in the heating mode, the hot air turns to cold air at first, then to hot air again after a while, and the cycle continues. What's going on?

Why is it that when Midea's air conditioner is turned on in the heating mode, the hot air turns to cold air at first, then to hot air again after a while, and the cycle continues. What's going on?

This situation is because the outdoor unit of the air conditioner needs to be defrosted when the air conditioner is heating.

During defrosting, the fan of the indoor unit stops working, the compressor of the outdoor unit works, the four-way valve reverses direction, and the fan motor of the outdoor unit stops. The defrosting time is about 5-10 minutes, and operation resumes after defrosting is completed. This is normal.

The principle of air conditioner defrost is that when the defrost sensor senses that the outside temperature is lower than a certain temperature, it will send the signal to the control board. At this time, the control board will send the defrost signal to the relevant components. Defrost. At this time, the defrost controller controls the reversal of the electromagnetic steering valve to reversely circulate the heat of the air conditioner to the outdoor unit and release the heat to the surface of the evaporator to defrost.

Extended information:

Meidi air conditioner common troubleshooting ideas and methods.

1. The fan speed is out of control

1. Check whether the wind wheel assembly is loose or stuck, and adjust it if so.

2. Check whether the wiring of the indoor electronically controlled fan is firm and reliable, and adjust it if there is any problem.

3. Turn on the air conditioner and turn on the air supply mode. If the fan fails to operate, check the AC voltage between the red line and the black line of the fan's high power output port.

4. Power on the air conditioner and turn on the air supply mode, if the fan can operate normally.

Check the DC voltage between the 1/3 pins of the fan feedback port:

1. If there is no voltage output, it is judged that the main board is faulty.

2. If there is voltage output, measure the voltage between pins 2/3 of the fan feedback port.

A. If the measured voltage is 5.5V, it is judged that the mainboard is faulty.

B. If the measured voltage is 2.5-3V, it is judged to be a motor failure.

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