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Why does the indoor unit of the air conditioner freeze? Reasons

Every user of a split system sooner or later faces problems in the operation of the air conditioner. This is not surprising, because that is why it is called a system, since it consists of many components connected to each other.

Sooner or later, any of the parts can fail and lead to unpleasant consequences. In particular, to the freezing of the internal unit of the air conditioner. In this article, we will explain in detail why the indoor unit of the air conditioner freezes, whether it is worth worrying about this and what to do if you encounter this problem.

General information

the air conditioner freezes

When users see frost or icing on the indoor unit, they often panic. Of course! Ice forms on the air conditioner right in their apartment or office, and then melts and flows down the walls.

We will surprise you if we say that sometimes a light veil of frost can form when the air conditioner is working normally. Of course, ice and water running down the wallpaper does not mean anything good, but light traces of frost do not always signal breakdowns.

Frost can form in the summer, if the device is working at full capacity. Thawing will begin naturally when you turn off the air conditioner.

Also, light icing may occur if you use the air conditioner in heating mode. If the frost is almost invisible and thaws quickly, while the condensate is easily removed through the drainage tube to the street, then everything is fine and you should not worry.

Please note! Frost or light icing can only be seen if you open the decorative cover of the indoor unit. In this case, frost is formed on the evaporator. If you notice heavy icing and it is noticeable without removing the decorative cover, urgently call the master from the service center!

Causes of freezing

During operation

air conditioner diagram

If you find that the evaporator of the air conditioner freezes during use*, we recommend that you first read the operating instructions of the device. Often the problem lies precisely in improper operation.

Check out the list of the main mistakes that users make when using an air conditioner:

  • The temperature and operating mode are incorrectly selected. Each air conditioner has an operating temperature range, which is specified in the service documentation. For example, from +5 to +40 degrees Celsius. And if you use the device when the temperature behind the cone is below +5 degrees or above +40, icing of both the indoor and outdoor unit is possible;

  • There is high humidity in the room. If you turn on the device for cooling in a room with high humidity, and even set the temperature below +20 degrees, there is a high probability of the formation of noticeable frost on the housing of the indoor unit. We recommend that you first dehumidify the air using the appropriate function in the air conditioner (DRY function), and also lower the temperature gradually.

  • Untimely or irregular cleaning of the indoor unit of the air conditioner. Cleaning should be carried out at least twice a year: before the use season and after it. The contamination of the indoor unit entails many problems, and the icing of the evaporator is one of them.

After installation and / or maintenance

air conditioner rattles

  • Perhaps, during maintenance, the master decided to refuel your air conditioner, but measured the amount of necessary refrigerant by eye, and refueled less than the required amount. In this case, an accurate measurement of how much freon is in the air conditioner and how much needs to be added will help;

  • Incorrectly performed evacuation of the freon route. Vacuuming is performed before refueling the freon to remove all excess moisture. If the process is performed with errors, without observing the rules, moisture may remain in the freon track. Over time, this will lead to icing of the indoor unit;

  • Incorrect installation of the indoor unit. This is generally a common problem that many users face. The problem lies in the installation location: in no case should the air conditioner be installed in a niche or in another enclosed space. The air conditioner must have unobstructed access to the air in the room. Otherwise, the evaporator may be covered with ice;

  • Careless installation of freon pipes or incorrectly selected length. With a lack of experience, the master can sloppily lay freon pipes, which will cause multiple creases and dents. But the» blood » of the split system circulates through the pipes-the refrigerant! Due to dents in the pipes, the pressure may change, the air conditioner will start working incorrectly, as a result, you will see icing on the surface of the block. Also, novice craftsmen often lay pipes of insufficient or, conversely, excessive length, which also leads to icing;

  • The tap on the suction tube of the outdoor unit is not open. There is a special tap on the suction tube of the outdoor unit that needs to be opened all the way. Often the masters open the tap incompletely or completely forget about it.

Other reasons

air conditioning does not work

  • The evaporator temperature sensor is not working correctly or has failed. Temperature sensor is extremely important for the proper operation of the entire split system, and if it fails, ice quickly freezes in the air conditioner, over time it begins to melt and flow down the walls into the room;

  • The fan is not working properly or has failed. The fan is one of the most important components in the air conditioning system. If it fails, ice can form in the shortest possible time;

  • The control board is faulty. This component is also extremely important for the proper operation of the split system. Without it, it is impossible to accurately adjust the operating mode of the air conditioner, the device can be buggy and turn on any modes that it wants. It is not uncommon for an air conditioner to literally start spitting ice!

If you have witnessed the icing of the indoor unit of the air conditioner, immediately call an experienced master from the service center!

Results

Now you know why the air conditioner can be covered with frost or ice. In some cases, this is absolutely normal, but if water begins to flow down the walls, or the ice is clearly visible without removing the decorative cover, then it’s time to sound the alarm.

This situation will be corrected only by an experienced specialist from the service center, so we do not recommend performing repairs yourself. Entrust this task to a professional. He will conduct a complete diagnosis of not only the indoor, but also the outdoor unit.

If you have previously encountered this problem, tell us about your experience in the comments below. It will be useful for both users and novice masters. We wish you good luck!

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