Why The Air Conditioner Is Not Cooling And Freezing


In the summer in Toronto, except for walking on the street, the rest are basically in air-conditioned rooms. I feel that it’s impossible to do without air conditioning. Air conditioning can give people a comfortable feeling, but there are often some problems when using air conditioning.

Causes and solutions of air conditioner freezing

  1. Insufficient refrigerant

After a long period of use, the air conditioner may leak refrigerant. When the refrigerant in the refrigeration system is reduced, the evaporator pressure is too low, causing the evaporator to freeze, and the location of the icing is usually at the front of the evaporator.

Solution: find out the leakage point, weld and repair the leakage point, and then add an appropriate amount of refrigerant, the fault will be eliminated.

  1. Compressor failure

After using the air conditioner for a long time, the compression efficiency of the compressor is reduced, or the valve system of the compressor is damaged, resulting in too low pressure and freezing. The icing position is also located at the front of the evaporator.

Solution: Add some refrigerant to eliminate the fault. If the fault is not eliminated, the compressor must be replaced.

  1. Too much refrigerant

We have already known that insufficient refrigerant will cause the air conditioner to freeze, but too much refrigerant can also cause the air conditioner to freeze. Due to air conditioner relocation, leakage, etc., some air conditioners need to be refilled with refrigerant, but too much refrigerant is added due to improper operation or maintenance personnel. The excessive refrigerant flows into the evaporator, which partially causes icing.

Solution: This type of icing releases excess refrigerant in the back part of the evaporator and around the compressor return pipe, so the fault is eliminated.

  1. The evaporator is too dirty

After using the air conditioner for a period of time, more or less dust and microorganisms accumulate on the evaporator, blocking the circulation of air, resulting in reduced heat exchange. The evaporator temperature is too low, resulting in icing, and the icing location is at the back of the evaporator.

Solution: After the ice dissolves, rinse the evaporator with water and scrub along with the fins with a soft brush. Remember to be careful not to wet the electrical parts.

  1. Thermostat failure

When the temperature changes, the gas pressure in the temperature sensor bulb of the mechanical thermostat will also change, thereby driving the thermostat contact action. Due to the adhesion of the contacts and insufficient spring force, the contacts are normally closed, and the air conditioner is continuously turned on, resulting in icing.

Solution: Replace the thermostat

  1. Small air volume

After the air conditioner has been used for a period of time, some fan blades will have a lot of dirt, which hinders the effect of air supply, causing the evaporator to freeze, and some fans slow down due to mechanical and electrical failures, resulting in a small air volume and causing the evaporator to freeze. . The main mechanical cause is the wear of bearings and bushes, the increase of resistance and the slower speed. Electrical faults are mostly capacitor charging and discharging faults or short circuits between turns of the fan, resulting in slow speed, or even burning of the fan windings and the motor not rotating.

Solution: Repair or replace the fan.

  1. The set temperature is too low

Some users set the preset temperature of the air conditioner too low, the cooling capacity of the air conditioner cannot keep up, the room temperature cannot be lowered to the set temperature, and the machine is turned on for a long time, or the shutdown time is short, which will cause the evaporator to freeze. The temperature drop in some rooms is very low, which may also cause the evaporator temperature to be too low and freeze. The icing position starts at the lower part of the evaporator.

Solution: Just set the temperature higher.

  1. The pipeline is blocked

The evaporator icing may also be caused by the blockage of the air-conditioning duct. When repairing the air conditioner, you need to check the location of the air conditioner duct blockage. Generally speaking, it is caused by a dirty blockage. After the fluorine is collected in the air conditioner, weld the dirty block, and then blow in nitrogen. Or cut and replace the clogging method, and then add refrigerant.

Daily maintenance method of air conditioner

  1. The air conditioner must be cleaned before use, and attention should be paid to check whether the air conditioner is leaking. If there is a leak, adding more refrigerant is useless. Pay more attention to daily maintenance.
  2. The air conditioner should not be turned on for a long time. It will be shut down for half an hour every 3 minutes. This not only protects our body but also saves electricity bills. Therefore, after using the air conditioner for a period of time, shut it down and open the windows for ventilation.
  3. When we use the air conditioner, we can check whether there is any dripping from the outdoor drain pipe. If there is, it means that the air conditioner is noticing and the cooling effect is very good. If it freezes, you need to turn off the air conditioner and clean it.
  4. If you find that the air conditioner is freezing, don’t worry. First of all, find the cause of the air conditioner’s icing, and then deal with it. The treatment method is also very simple. Just wait for the air conditioner to freeze and clean it from the inside to the outside.

The above are the main reasons and solutions for air conditioner icing shared by Canada Energy Solution air conditioner maintenance. In fact, the best way to avoid air conditioner icing or other malfunctions is to maintain air conditioners frequently, so as to avoid Some unnecessary questions!

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