Owners of Belarusian-made equipment are often faced with a situation where a snow coat or ice crust suddenly begins to form inside the refrigeration chamber. Atlant two-chamber refrigerator, despite its reliability and time-tested design, it is susceptible to the same technical problems as other models. The appearance of ice on the back wall is not just an aesthetic defect, but a signal of a violation of the thermal balance or malfunction of the automation.
Ignoring this symptom can lead to more serious consequences, such as failure of the compressor due to constant operation in increased mode or spoilage of food due to temperature changes. It is important to understand that modern temperature control systems require accurate tuning and proper functioning of all sensors. If you notice that ice is freezing it is uneven or its amount increases with each cooling cycle, it is necessary to carry out an initial diagnosis.
In this article we will analyze in detail the main causes of icing, consider the differences between drip-type and No Frost systems, and also provide a step-by-step algorithm of actions for troubleshooting on your own or making a decision to call a technician.
The principle of operation of the defrost system and the causes of condensation
To understand why moisture and subsequent ice appear, you need to briefly consider the physics of the process. In standard models, moisture naturally settles on the coldest surface - the rear evaporator. During normal operation, this moisture freezes, and then, when the compressor stops, it melts and flows into the drainage tray. Violation of this cycle leads to the fact that the water does not have time to drain and turns into an ice block. drip system moisture naturally settles on the coldest surface - the rear evaporator. During normal operation, this moisture freezes, and then, when the compressor stops, it melts and flows into the drainage tray. Violation of this cycle leads to the fact that the water does not have time to drain and turns into an ice block.
The situation is aggravated if the tightness of the circuit is broken or the user often opens the door. Warm, moist air from the room, entering the chamber, cools sharply. The moisture contained in it instantly condenses on the walls. If the defrost system is working properly, it can handle this volume of water. However, if there are malfunctions, moisture will accumulate.
⚠️ Attention: If ice forms only at the bottom of the rear wall or around the drainage hole, this often indicates a local clogged drain rather than a breakdown of the electronics.
Particular attention should be paid to models with the system No Frost. In them, ice freezing on the rear wall of the refrigerator compartment is physically impossible in good condition, since the evaporator is hidden there. The appearance of snow in the chamber of such models (for example, series Atlant XM-4425) indicates that cold air from the blowing of the evaporator, covered with frost, enters directly into the chamber due to a loose damper or a circulation disorder.
Thermostat and temperature faults sensor
One of the most common causes of excessive ice freezing is incorrect operation of the thermostat. This device is responsible for turning the compressor on and off depending on the temperature inside the chamber. If thermostat sticks in the "on" position or transmits incorrect readings to the electronic module, the compressor operates without interruption.
As a result of constant cold, moisture does not have time to melt and evaporate. It accumulates in layers, turning into a thick crust of ice. In older mechanical Atlant models (for example, series MHM 1700), the thermostat is a device with a capillary tube, which over time can lose its tightness or move.
In more modern models with electronic control, they are responsible for temperature control thermal sensors (thermistors). Their resistance changes depending on temperature. If the sensor “lies” and shows the module that it is warm in the chamber, although in fact it is already frosty there, the system will continue to pump in cold.
- 🌡️ Signs of failure: the compressor hums constantly, without turning off, the temperature in the chamber is lower than the set one.
- ❄️ Visual effect: ice covers the entire back wall with an even layer, food freezes at the back wall.
- ⚙️ Technical detail: in Atlant electronic models, a sensor error is often indicated by a flashing temperature indicator on the door.
Replacing a thermostat or sensor is a procedure that requires disassembling the internal panel and the presence of a multimeter to check the resistance. It is important to choose an analogue with identical characteristics, otherwise the refrigerator’s operating cycle will be disrupted.
Problems with the defrost heating element and timer (for the No Frost system)
If we are talking about a two-chamber Atlant refrigerator with the system No Frostthen the formation of ice inside the chamber or on the evaporator (which indirectly affects the operation of the refrigerator) is most often associated with a malfunction of the defrost system. This system consists of a heater (heating element), a defrost timer or electronic module, and a defrost sensor.
During operation, frost freezes on the hidden evaporator. Periodically, according to a timer signal, the compressor stops and turns on The defrosting heating element. It heats the evaporator, the ice melts and the water goes into the drain. If the heating element burns out, the ice does not melt. Over time, there is so much of it that it blocks the cold air supply channels or, collapsing, falls into the chamber.
Also often fails defrost sensor. It should turn off the heater when the ice melts to avoid overheating the system. If it is faulty, the defrost cycle may not start at all or may be interrupted too early. In models Atlant 4025 and similar, this leads to the fact that the fan begins to drive pieces of ice into the chamber or simply cools the space ineffectively.
⚠️ Attention: Operation of the No Frost refrigerator with an inoperative defrost heating element leads to ice accumulation on the fan. This causes a characteristic crackling and humming noise, and can then lead to the fan motor jamming.
Diagnostics require removing the back panel in the freezer (where the evaporator is located). It is necessary to “ring” the heating element for an open circuit. Often it is not the heating element itself that burns out, but the fuse that goes in the circuit, or the contact is broken at the soldering points.
☑️ Diagnostics of the No Frost system
Violation of the tightness of the door and seal
Often the problem lies not in a complex electronics, but in a banal leak. Rubber seal (cuff) around the perimeter of the door ensures a tight fit of the leaf to the body. Over time, rubber hardens, cracks or becomes deformed. In places where there is a loose fit, warm air is constantly sucked in.
The humidity of this air is high, and upon contact with the cold back wall, it instantly turns into condensation, which then freezes. In Atlant two-chamber refrigerators, this is especially noticeable in the lower part of the door, where the seal experiences the greatest load.
You can check the tightness with a simple test with a sheet of paper. Clamp the sheet with the door around the perimeter. If it is pulled out too easily or, conversely, with difficulty in some places, the tightness is broken. Also, the cause may be door misalignment due to wear on the hinges.
- 🚪 Symptom: ice forms locally, closer to the place of loose fit (usually in the corner or below).
- 🌡️ Effect: the refrigerator works longer, trying to compensate for the heat influx, which increases the formation of ice.
- 🛠️ Solution: replacing the seal or adjusting the door fastening hinges.
Sometimes it helps to simply defrost and warm up the deformed area of the seal with a hairdryer to restore its elasticity, but this is a temporary measure.
How to replace the seal correctly?
Remove the old seal by washing the groove in the door. It is recommended to keep the new seal in a warm room for a day before installation. Laying begins from the top corner, gradually pressing the profile into the groove along the perimeter. After replacement, it is better to lock the door in the closed position for several hours.
Clogged drainage hole
In refrigerators with a drip moisture removal system (crying evaporator), the condition of the drainage hole is critically important. It is located at the bottom of the rear wall of the refrigerator compartment. Through it, melt water flows into a container above the compressor, where it evaporates.
If crumbs, mold or mucus get into the hole, a plug is formed. The water has nowhere to go, it accumulates in the groove, freezes, and this ice grows upward, capturing part of the back wall. In models Atlant MXM 2808 and similar, this is one of the most common causes of a “snow coat” at the bottom of the chamber.
For cleaning, you can use a special brush-brush (often included) or soft wire/fishing line. Do not use sharp metal objects to avoid damaging the internal circuit or tubes of the evaporator, which will lead to freon leakage.
| Symptom | Probable cause | Nature of ice | Actions |
|---|---|---|---|
| Ice at the bottom of the rear wall | Drainage clogged | Ice plug at the hole | Clean the drain |
| Ice all over the wall | Faulty thermostat | Thick uniform crust | Replace the thermostat |
| Snow in the chamber No Frost | Failure of defrost/damper | Loose snow or pieces ice | Check the heating element and sensors |
| Ice at the door | The seal is torn | Ice opposite the leak | Replace the seal |
Rare causes and mechanical damage
There are less obvious causes that are worth considering if standard diagnostic methods are unsuccessful. For example, refrigerant leak. Paradoxically, if there is a partial leak of freon, the refrigerator may work longer, trying to gain temperature, which leads to freezing of the evaporator. However, more often, when there is a leak, ice does not freeze at all, or appears only in one corner of the evaporator.
Another reason is a manufacturing defect or a violation of the housing foaming technology. If there are microcracks or voids in the wall of the refrigerator, moisture can accumulate there, which then appears inside in the form of frost. This is typical for some batches of equipment produced during certain periods.
It is also worth mentioning the malfunction of the air flow control damper (in two-chamber models with one compressor). If the damper that regulates the supply of cold from the freezer to the refrigerator compartment does not close completely, excess cold air enters the chamber, which leads to icing.
⚠️ Attention: If you suspect a freon leak (the refrigerator is working, but not freezing, or only part of the condenser is heated at the back), independent repair is impossible. You need to call a technician with equipment for vacuuming and filling.
Frequently asked questions (FAQ)
Is it possible to defrost refrigerator Atlant with a knife or sharp objects?
Absolutely not. The inner walls of the refrigerator contain evaporator tubes that are very close to the surface of the plastic. One careless movement will lead to a puncture, freon leak and expensive repairs with replacement of the evaporator. Use only warm water and a hairdryer.
How often do you need to defrost a two-chamber Atlant?
Models with a drip system require defrosting at least 1-2 times a year for hygiene and checking drainage. Models with the No Frost system theoretically do not require defrosting, but a preventive shutdown once a year is useful to check the condition of the seals and ventilation ducts.
Why did ice appear again after a couple of days after defrosting?
This indicates that the cause has not been eliminated. Defrosting only temporarily removes the consequences. If you do not replace the faulty sensor, do not clean the drainage or repair the defrost system, the cycle of ice formation will repeat immediately after the unit is restored to operation.
Does installing a refrigerator near the battery affect the formation of ice?
Yes, it does indirectly. If the refrigerator is located close to a heat source or is exposed to direct sunlight, the compressor is forced to work under increased load. This can disrupt the cyclical operation and contribute to more intense condensation of moisture, especially if the thermostat does not have time to respond correctly to heat inflows.
What to do if, after replacing the thermostat, the refrigerator starts to turn on frequently?
Perhaps the new thermostat has different parameters or the capillary tube is installed incorrectly. Check the tight fit of the sensor tube to the evaporator - it must be fixed with a special bracket and in contact with the surface through heat-conducting paste (if provided).