Why does my air conditioner keep freezing up?

- Apr 10, 2018-

In summer, small scale air conditioners often freeze in the room. Why do they freeze and how to get rid of them? Here are the following

The first reason

The refrigerant is not sufficient, because of the installation or use of the air conditioner for a long time, there will be a refrigerant leakage or leakage.

When the refrigerant in the refrigeration system is reduced, the evaporator is frozen and the frozen position is usually in the front part of the evaporator.

The removal method is to handle the leaking part first, add sufficient refrigerant, the fault will be eliminated.

The second reason


Low efficiency, long time for compressor failure, Compressor compression efficiency is reduced, or compressor distribution system is damaged, resulting in low pressure and freezing.

The freezing position is also in the front part of the evaporator. The former is added with some refrigerant and the fault can be excluded.If the fault persists, the compressor must be replaced.

The third reason

The refrigerant is much more, and some air conditioners are reinjected into refrigerant because of displacement and leakage.The operation of the maintenance personnel improperly added the refrigerant, resulting in excessive refrigerant flow to the evaporator and partially evaporated and froze.

This type of ice is often attached to the rear part of the evaporator and the compressor back to the trachea. The troubleshoot will be done if release excess refrigerant.

The fourth reason

Heat exchanger is dirty, If the evaporator is dirty and the air conditioner is used for a period of time, the dust in the air or the microorganisms produced by the evaporator will accumulate on the evaporator, hindering the air circulation, causing the heat exchange to decrease, and the evaporator temperature being too low to freeze

When the ice is melted, rinse the evaporator with water and brush the fin with a soft brush, and be sure not to wet the electrical part. After cleaning, troubleshooting.

The fifth reason

Defective temperature probe or improper installation of temperature probe, temperature control failure

temperature controller

The pressure of the temperature package changes with the temperature, and the thermostat contact action is driven.

The contact is often closed due to contact adhesion and spring force shortage, and the air conditioner is turned on continuously, resulting in icing. Replace the thermostat and troubleshoot.

There are also special cases where the thermostat is not damaged and the air conditioner is down for short or no downtime.

Because the thermal package is a u-shaped plastic shelf suspended in the middle of the evaporator about 2mm. It is estimated that the design of the manufacturer is designed to keep the temperature of the thermostat warm, and to prevent the air conditioning from starting frequently (within 3 minutes).

Hot summer season, indoor temperature is high, add the limitation of air conditioning itself refrigeration, temperature controller is very difficult to reach the control temperature break point, The air conditioner stops for a short period of time, and even starts up continuously, resulting in icing.

This type of ice is often attached to the bottom of the evaporator. This condition must be moved to the bottom of the evaporator and fixed with the evaporator fins.

The sixth reason

The air volume of the internal machine is small. After the air conditioner is used for a period of time, there are some fans, and the fan blade is sticky with a lot of masonry, which affects the supply of air, causing the evaporator to freeze. Remove the masonry and troubleshoot.

There are also some fans due to mechanical, electrical failure and slow speed, small wind volume, caused the evaporator to freeze. The mechanical reasons are mainly bearing, bearing and bearing wear, increasing resistance and slow speed. Electrical faults are mostly capacitors.

Failure of charging and discharging or short circuit between fan turns, resulting in slow speed, even the fan winding is burnt down and the motor does not turn. This freezing phenomenon should be repaired or replaced by a fan.

The seven reasons

Temperature is set too low, some users set the air-conditioner temperature is too low, the refrigerating capacity can't keep up with the air conditioner, room temperature drop less than set temperature and long time to boot up, or down time is very short, can cause the evaporator to freeze.

Some rooms have a very low temperature, which can cause the evaporator to freeze too low. This type of ice begins with the bottom part of the evaporator. As long as the temperature is set higher, the fault can be ruled out.