Appearance an abundant snow “coat” or ice crust on the back wall of the refrigerator Atlant is a signal that cannot be ignored. Owners often notice that food freezes to the inner surface, and the compartment becomes too cold or, conversely, the temperature fluctuates. This is not just an aesthetic defect, but a clear malfunction of the cooling system, requiring immediate intervention.
Ignoring the problem can lead to failure of the compressor due to constant wear and tear or food spoilage. In refrigerators with a No Frost system, there should be no ice at all on the back wall, and in models with a drip system (“Crying Wall”), only short-term formation of condensation is allowed, which should flow into the drain. If you see a massive layer of ice there, it means the defrost cycle is broken.
In this article we will analyze in detail the main causes of ice formation, self-diagnosis algorithms and troubleshooting methods. You will learn how to check the thermostat, defrost sensors and heating element in order to return the equipment Atlant to normal operation without calling a technician.
The principle of operation of the defrost system and the causes of failure
To understand why ice freezes, you need to briefly consider physics of the process. Modern models Atlant use either a drip system, where moisture condenses on a cold wall and flows down, or a No Frost system, where air is forced to circulate and the evaporator is hidden. In both cases, the periodic defrostplays a key role. If this process does not start on time or is not completed completely, the moisture turns into ice.
The main reason for the failure lies in the imbalance in the operation of the control elements. The electronics “think” that the evaporator temperature has reached the desired value, but the sensor may be lying. Or the heating element (heating element) turns on regularly according to the timer, but is burned out and does not heat. As a result, during one cycle of compressor operation, more ice freezes than has time to melt during the pause.
Users often confuse normal light fogging with pathology. However, if the thickness of the ice exceeds several millimeters or it covers the entire area of the rear panel, including the shelves, it is malfunction. It is important to distinguish a temporary phenomenon after loading warm products from a system defect that progresses with each hour of operation of the unit.
⚠️ Attention: Do not try to chip the ice with a knife or sharp objects! In models Atlant the evaporator is often built into the wall or located in close proximity. One awkward movement will lead to a breakdown of the circuit and leakage of freon, after which repairs will become economically unfeasible.
Why does ice form at the back?
The back wall in most Atlant refrigerators is a screen behind which is hidden evaporator This is where the most intense cooling occurs. If the outflow of heat or air circulation is disrupted, moisture from the air of the food instantly crystallizes on the coldest surface of the chamber.
Primary diagnostics: defrosting and checking the seal
Before disassembling the equipment and arming yourself with a multimeter, it is necessary to exclude the most banal causes. Often the problem lies not in the electrical system, but in improper operation or minor mechanical failure. The first step should always be to fill the refrigerator. defrost refrigerator.
Unplug the unit, remove all food and leave the doors open for at least 24 hours. Yes, 24 hours is important, since ice in drainage channels and between layers of insulation can take a very long time to melt. If after turning on the refrigerator worked normally for a couple of days, and then the situation repeated itself, the problem is in the automation. If the ice has not gone away even after a long defrosting, the drainage may be clogged.
Be sure to check the condition of the rubber seal around the perimeter of the door. If it does not fit tightly, warm, moist air from the room constantly enters the chamber. The compressor tries to cool this volume, the back wall freezes, forming a giant snowdrift. Wipe the rubber with a soft cloth and check the tightness of the fit with a sheet of paper: it should be pulled out with force along the entire perimeter.
☑️ Primary diagnostics of the refrigerator
Thermostat malfunctions and temperature sensors
One of the most common reasons why the back wall freezes in the refrigerator is the failure of the thermostat (thermostat) or air sensors. These devices are responsible for turning the compressor on and off. If the thermostat “sticks” in the “on” position, the motor works non-stop, freezing out all the contents. Atlant the back wall freezes, or the thermostat or air sensors fail. These devices are responsible for turning the compressor on and off. If the thermostat “sticks” in the “on” position, the motor runs non-stop, freezing out all the contents.
In models with electronic control, sensors installed at different points in the chamber are responsible for the temperature. If the evaporator sensor transmits incorrect low temperature data, the control unit may not give a command to turn on the defrost heating element. As a result, the evaporator becomes overgrown with ice, which blocks the cold air supply channels.
To check the mechanical thermostat, it can be temporarily closed to make sure the compressor is working, or, conversely, removed from the circuit. However, it is better to carry out accurate diagnostics by replacing it with a known-good element. In electronic models, you will need to test the sensors with a multimeter: their resistance should change as the temperature changes.
Problems with the defrost heating element and timer (defroster)
If the refrigerator operates cyclically (turns on and off), but ice still accumulates, most likely the defrost system is not working. The main suspect here is Defrost heating element. This is a tubular heater that is located on the evaporator (often behind the back wall). If it burns out, the ice does not melt during the compressor pause.
The second element of the circuit is the defrost timer (defroster) or the electronic module that controls it. It counts the operating time of the compressor and switches the refrigerator to defrost mode. If the timer is stuck in the “cooling” mode, the heating element simply will not receive voltage, even if it is working properly. In older models Atlant there are mechanical timers that wear out over time.
The circuit also includes a thermal defrost relay. It protects the heater from overheating. If the relay burns out, it breaks the power supply circuit of the heating element. Diagnosis of this group of faults requires removing the rear panel in the freezer compartment (or in the main one, depending on the model) and “diagnosis” of the elements with a tester.
⚠️ Attention: When checking the heating element and sensors, be sure to turn off the power to the refrigerator. Working with live electrical components is dangerous to life, and the humid environment inside the chamber increases the risk of electric shock.
Table of main faults and methods for eliminating them
For ease of diagnosis, we have systematized the main symptoms and probable causes in a table. This will help you quickly figure out which unit requires attention in your particular case.
| Symptom | Probable cause | Elimination method | Difficulty of repair |
|---|---|---|---|
| Ice only in freezer, warm in the positive chamber | Faulty damper or fan | Replace the motor or adjust the damper | Medium |
| "Fur coat" along the entire back wall, the compressor does not turns off | The thermostat is faulty or there is a freon leak | Replacing the thermostat or looking for a leak | High (for freon) |
| The ice freezes unevenly, more at the bottom | The drainage hole is clogged | Cleaning the drainage with a brush or hot water | Low |
| The refrigerator turns off, but the ice does not melts | The defrosting heating element or timer has burned out | Replacing the heating element or timer/module | Average |
Rare causes: control module and freon leak
If all mechanical and electrical components of the defrost circuit are working properly, and ice continues to accumulate, the problem may lie in the “brains” of the refrigerator - the electronic control module. The board could malfunction due to a voltage surge or contact oxidation. In this case, the relay on the board does not switch modes, and the refrigerator operates in emergency mode of constant cooling.
Another serious reason is a partial leak of refrigerant (freon). If there is a shortage of gas, the pressure in the system drops, the evaporator cools unevenly or, conversely, too intensely at the starting point, causing local freezing. In this case, the compressor works almost non-stop, trying to reach the set temperature, but cannot.
Diagnostics of a leak requires special equipment (leak detector), so it is difficult to do this at home. An indirect sign may be a hot condenser (grid at the back) only partially or its cold state when the motor is running. Also, rust or oily stains may appear on the tubes at the soldering points.
In models Atlant with one compressor and two chambers, leakage often occurs in the foamed part of the housing (internal circuit). This is a complex case that requires the installation of an external evaporator (“crying” tube inside the chamber), which is a full-fledged repair in the workshop.
Prevention and operating rules
To avoid the re-formation of an ice crust on the back wall, it is important to follow the operating rules. Do not place hot or even warm food in the refrigerator. The evaporation of moisture from them sharply increases the humidity inside the chamber, and the defrost system may not be able to cope with this volume of condensate.
Regularly check that the products are not blocking the ventilation holes (if your model has them) and the evaporator area. Air circulation must be free. Also, do not forget to wash the drainage hole at least once a year with warm water with the addition of soda to prevent the formation of plugs from mucus and fat.
Compliance with temperature conditions also plays a role. Do not set the temperature control to maximum unless necessary. In the summer, when the room is hot, the load on the refrigerator increases, and setting the minimum temperature can lead to continuous operation of the compressor and freezing.
Frequently asked questions (FAQ)
Is it possible to operate the Atlant refrigerator if there is ice on the back wall?
Short-term exploitation is possible, but undesirable. Constant work with a frozen evaporator leads to overload of the compressor, increased energy consumption and the risk of defrosting food in the main chamber due to impaired heat exchange. It is better to carry out diagnostics.
Why did the ice appear again after 2 days after defrosting?
This indicates a malfunction of the automatic defrosting system. Most likely, the heating element, timer or sensor is not working. The ice does not have time to melt in the time allotted by the program, and with each cycle it becomes more and more.
How much does it cost to replace the defrost heating element in the Atlant refrigerator?
The cost consists of the price of the spare part and the work of the technician. The heating element itself is inexpensive, but replacing it often requires complete defrosting and disassembling of the freezer, which is labor-intensive. It is better to check the exact price at service centers in your region.
Is it necessary to pick the ice if the refrigerator does not defrost itself?
Absolutely not. Mechanical deicing may damage the evaporator. If the defrosting system does not work, the only safe way is complete natural defrosting during the day with the doors open.