The discovery of an ice crust or a massive coat of snow on the back inner wall of the refrigerator Atlant often becomes an unpleasant surprise for the owner. Many users of the No Frost system mistakenly believe that no ice should form in their device at all, and begin to panic when they see the first crystals. However, not all models of the Belarusian brand are equipped with a full automatic defrosting system, and some nuances of the compressor operation may be quite standard.
In this article we will analyze in detail the physical principles of the operation of the refrigeration chamber, technical malfunctions and the human factor leading to freezing of the evaporator. Understanding why the back wall freezeswill help you avoid costly repairs or, conversely, call a technician in time to replace failed components.
Often the problem lies in a banal violation of operating rules, which are forgotten after years of using the equipment. In other cases, we are talking about the failure of electronic components that control defrost cycles. Let's look at all the scenarios in order so that you can accurately diagnose the situation.
Operating principle and natural formation of condensation
The rear wall of the refrigerator compartment in models Atlant with a drip defrosting system (or mixed system) is the direct location of the hidden evaporator. During operation, the compressor pumps refrigerant, which, passing through the tubes inside the wall, actively absorbs heat from the internal volume of the chamber. Due to the low surface temperature, the moisture contained in the air condenses there.
This physical phenomenon is absolutely normal and even necessary to maintain the correct level of humidity. Water flows along the relief surface into a special groove, from where it goes through the drainage hole into the container above the compressor, where it evaporates. Drip system works cyclically: while the compressor is humming, the wall becomes covered with frost, when it turns off, the ice melts.
However, if you see that the back wall has turned into a solid piece of ice, blocking access to the products, then the cycle is broken. Under normal conditions, ice should not accumulate in layers. If the water does not have time to drain or evaporate, the process of forming a “snow coat” begins, which reduces the cooling efficiency and increases energy consumption.
⚠️ Attention: If the ice crust on the back wall is less than 1-2 mm thick and disappears immediately after the compressor is turned off, this is the normal operation of the drip system, and not a breakdown.
It is important to distinguish between models with technology No Frost and classic refrigerators. In the first, the back wall inside the chamber is usually plastic and dry, since the evaporator is hidden behind the panel, and the air is forced by a fan. If in a model with declared No Frost ice appears on the back wall of the chamber, this is almost always a sign of a malfunction of the defrost system or a leak.
Violation of operating rules and human factor
Before looking for complex technical faults, it is necessary to analyze exactly how the refrigerator is used. Often the reason that the back wall freezeslies in the actions of the user himself. Hot food placed on a shelf releases enormous amounts of steam. This steam instantly condenses on the coldest surface - the back wall, creating an excess load on the defrost system.
The condition of the sealing rubber on the door is also critically important. If the cuff is worn out, dirty or the door is skewed, warm, moist air from the room constantly enters the chamber. The cooling system tries to compensate for the heat by working without interruption, which leads to intense ice freezing. Check the fit of the door using a sheet of paper: if it easily pulls out when the door is closed, the seal is broken.
Incorrect installation of products also plays a role. If vegetables or packages are pressed tightly against the back wall, they block the condensation drain. The water does not go into the drainage, freezes below and gradually “creeps” upward, forming an ice shell. In addition, the food itself can freeze to the wall, becoming damaged when you try to tear it off.
Following simple rules will help avoid 80% of problems with freezing:
- ❄️ Never put hot or warm foods inside the chamber, let them cool to room temperature.
- 🚪 Check tightly seal the door and clean the seal from crumbs and grease.
- 🥦 Do not press the products close to the back wall, leave a gap for air circulation.
- 🧊 Do not store products in open containers, use containers or cling film.
Malfunctions of the defrost system and sensors
If the operating rules are followed, and the ice continues to grow, the problem lies in the hardware. In refrigerators Atlant with a system No Frost the defrosting unit is responsible for removing ice on the evaporator. It consists of a heating element (heater), a timer or electronic module, and a temperature sensor. If any of these elements fails, the defrost cycle does not start, and the evaporator becomes overgrown with ice, which can then appear on the back wall of the chamber.
One of the common causes is breakdown defrost sensor. This thermistor controls the temperature of the evaporator. If it “lies” and shows that there is no ice (although there is some), the control module will not give the command to turn on the heating element. As a result, the refrigerator freezes until it stops until the compressor wears out or burns out from overload.
The heating element itself may also fail. A burnt-out heating element coil will physically not be able to melt the ice. In mechanically controlled models, this is responsible for the defrost timer, which over time may stick or stop switching contacts. Diagnostics of these units requires a multi-multimeter!
⚠️ Attention: Replacing the heating element or sensors yourself requires disassembling the rear panel of the freezer. Do not carry out work without disconnecting the device from the power supply!
Symptoms of a defrosting system malfunction often manifest themselves not only as ice, but also as a change in the background sound. The refrigerator may hum longer than usual, trying to gain temperature, or, conversely, remain silent if the compressor protection has tripped. In some cases, “icicles” appear on the back wall inside the chamber, hanging from the ceiling or sides, which indicates that the drainage is overflowing due to ice in the hidden area.
Problems with the thermostat and temperature control
The thermostat (thermostat) is the “brain” that decides when to turn on and when to turn off the compressor. If this mechanism fails or its capillary tube is not properly secured, the refrigerator may operate non-stop. Continuous operation leads to the fact that the moisture does not have time to melt in pauses, and the back wall is covered with a thick layer of fur coat.
In modern models Atlant with electronic control, the thermostat function is performed by a temperature sensor. If it shows incorrect data (for example, that the chamber is +10°C, although it is already -5°C), the module will keep the compressor on constantly. This is easy to check: if the food in the refrigerator compartment begins to freeze (milk turns into ice, cucumbers become soft), it means that the temperature has dropped critically.
Users often set extremely low temperature values themselves. Setting the “Super Freeze” mode or minimum values (1-2 divisions) for a long time in normal operation is not necessary. This leads to freezing of the back wall even with working equipment.
| Symptom | Possible cause | Action |
|---|---|---|
| Ice only on the back wall | Violation of storage rules, hot products | Normalize operation |
| Ice throughout the chamber and on the products | Thermostat or sensor is faulty | Replacing the temperature sensor |
| The refrigerator does not turn off | Contact sticking or freon leak | Master diagnostics |
| Ice at the bottom and on the floor of the chamber | Drainage is clogged | Cleaning the hole |
How to check the thermostat yourself?
Unplug the refrigerator, find the thermostat (usually inside the chamber or on the body). Test its contacts with a multimeter. As the temperature changes, the resistance should change. If the device shows a “break” or “short” regardless of the temperature, it is faulty.
It is important to understand the difference between short-term operation at maximum and constant operation. If you have just loaded a lot of food and turned on quick freezing, ice on the wall is acceptable. But if this mode lasts for weeks, expect a compressor breakdown.
Clogged drainage system
One of the most commonplace, but common reasons why the rear wall below freezes is a clogged drainage hole. It is located at the bottom of the rear panel of the refrigerator compartment. Through it, the melt water should go into the tray above the motor. If the hole is clogged with crumbs, mold or pieces of packaging, the water has nowhere to go.
As water accumulates, it freezes, forming an ice plug. With each new defrost cycle, the volume of ice increases until it begins to protrude onto the refrigerator shelf. Visually, it looks like ice in the lower part of the back wall, which can gradually rise higher.
For cleaning, you can use a soft wire, a cotton swab or a special brush. Carefully insert the tool into the hole and make several rotational movements. After this, pour some warm (not hot!) water into it to make sure that it flows freely. If the water is standing, the procedure must be repeated.
☑️ Cleaning the drainage
Refrigerant leak and system blockage
The most serious technical problem leading to freezing is a violation freon circulation. If a microcrack has formed in the system and the refrigerant has partially escaped, or the capillary tube is clogged (blockage), the pressure in the circuit drops. The compressor starts working non-stop, trying to compensate for the lack of cold.
In such cases, the back wall (evaporator) may become covered with an uneven layer of frost or ice, sometimes only in a certain place (for example, only in a corner or only the tubes are visible through the ice). A characteristic sign is that the refrigerator hums constantly, but the temperature inside does not drop to the required values.
It is impossible to eliminate a leak or blockage on your own. You need to call a technician with equipment to evacuate the system, find leaks, seal and refill with new freon. Operating a refrigerator with a freon leak is unacceptable, as this leads to the burning of an expensive compressor.
⚠️ Attention: If you hear a hissing sound when the refrigerator is operating or see oily stains on the floor underneath it, immediately turn off the appliance and call a specialist. These are signs of a refrigerant leak.
Proper defrosting and prevention
Regular maintenance prolongs the life of equipment. Even if you have a model No Frost, preventative defrosting once every year and a half will not hurt to remove the smell and check the drainage. For models with a drip system, defrosting is required more often if you notice signs of freezing.
The process of proper defrosting looks like this: unplug the device, remove all products, open the doors. Leave the refrigerator to defrost naturally. Never use a knife, hair dryer or boiling water to speed up the process - this is guaranteed to damage the evaporator and void the warranty.
After all the ice has melted, thoroughly wipe the insides with a dry cloth. Be sure to clean the drainage hole. Leave the refrigerator turned off for another 2-3 hours to dry out any hidden cavities. Then turn it on empty for 1-2 hours to set the temperature, and only then load the food.
Why does the back wall in the Atlant refrigerator become covered with ice immediately after defrosting?
If ice appeared immediately after switching on, most likely the defrosting technology was violated (they were not allowed to dry) or warm foods were placed in the chamber. It is also possible that the drainage was not cleaned and the residual water froze.
Is it possible to operate the refrigerator if there is ice on the wall?
For a short time - yes, but this will increase energy consumption and the load on the compressor. Constant operation with a “fur coat” will lead to breakdown of the defrost system or failure of the motor.
Is it necessary to change the seal if it is just tight?
If the door closes tightly and the sheet of paper is clamped around the entire perimeter, there is no need to change it. Tightness is normal. It is worth changing only if there is visible damage, stickiness or loose fit.
How often does Atlant with a drip system need to be defrosted?
The manufacturer recommends defrosting as needed, when the layer of frost reaches 3-5 mm. On average, this happens once every 4-6 months during normal operation.