The detection of a snow coat or ice crust inside the fridge compartment of a modern refrigerator is always a signal that the system No Frost or automatic defrosting is not working correctly. Owners of Belarusian equipment Atlant often encounter a situation where ice crystals begin to grow on the back wall, where the evaporation tubes are located, turning into a dense layer of snow. This phenomenon not only reduces the useful volume of the chamber, but also forces the compressor to work with increased load, which leads to excessive energy consumption.
The reasons for the formation of ice can vary from a banal violation of operating rules to a serious breakdown of electronic control components. Unlike older models with manual defrosting, in units Atlant with the “Weeping Wall” or full system No Frost moisture must be effectively removed. If you see snow, it means that the water drainage or temperature control process is broken, and ignoring this symptom can lead to failure of an expensive compressor.
This article will help you carry out an initial diagnosis, understand the physical nature of the freezing process and determine whether you can solve the problem yourself or whether you will need to call a technician. We will analyze the most likely failure scenarios for various series of refrigerators Atlant, including two-chamber models with a bottom and top freezer.
The principle of operation of the defrost system in Atlant refrigerators
To understand why a malfunction occurs, you need to briefly consider the design of the cooling system. Refrigerators Atlant use a combined system: the freezer, as a rule, is equipped with a system No Frostwhere the evaporator is hidden behind a plastic panel, and the cold is pumped by a fan. The refrigerator compartment in most models operates on the “crying wall” principle: moisture condenses on the rear panel, flows into the drainage hole and evaporates in a tray above the compressor.
The key element here is the defrost cycle. Periodically, based on a signal from a timer or electronic module, it turns on Defrost heating element, which heats the evaporator, turning the accumulated frost into water. If this process is interrupted or does not occur completely, the remaining moisture freezes during the next cooling cycle, forming an increasingly thick layer of ice. In models with a “crying wall”, a similar role is played by the thermostat, which must turn off the compressor before the temperature on the rear wall drops below zero.
⚠️ Attention: In models with electronic control, defrost cycles are recorded in the controller’s memory. Resetting errors is often possible only after completely disconnecting the device from the network for a long period (more than 40 minutes).
Heat transfer disruption is always a balance between heat input (through the walls, when opening the door) and its removal. If heat dissipation is (impeded) due to ice, the system tries to compensate by running the compressor longer, which only makes the situation worse. Understanding this cycle helps to correctly interpret the symptoms: for example, if snow appears only in hot weather, the problem may be with overheating of the condenser, and not with the defrost system.
The main reasons for ice freezing on the back wall
There are several key factors leading to the formation of a snow coat. Most often, the problem lies in one of the sensors of the control system. Defrost sensor (defroster) may show incorrect temperature values, which is why the control module “does not see” the need to turn on the heating. As a result, the evaporator becomes overgrown with ice, the fan (if there is one in this area) begins to hum or stops, and the cold stops circulating normally.
The second common cause is a malfunction air flow regulator dampers. In two-chamber models Atlant cold from the freezer is supplied to the refrigerator compartment through a channel with a damper. If the damper mechanism is stuck open or does not close tightly, excess cold enters the chamber. Air humidity instantly freezes on the back wall, forming a dense layer of frost, which over time turns into an ice ball.
- ❄️ Heating element malfunction: The heating element has burned out or gone into a break, physical defrosting does not occur.
- 🌡️ Thermostat failure: The mechanical regulator is “stuck” in the position of maximum cooling capacity.
- 💨 Problems with fan: The blades are frozen or the motor is burned out, air circulation is impaired.
- 🚪 Loose fit of the door: The constant flow of warm, humid air leads to increased condensation.
It is also worth considering the condition of the sealing rubber. If seal the door is damaged, dirty or simply lost elasticity, the tightness of the chamber is broken. Warm air, containing a lot of moisture, is constantly sucked in. The cooling system does not have time to remove this volume of moisture through the drainage, and it settles in the coldest areas - usually the upper part of the rear wall or the corners of the chamber.
Diagnostics of the No Frost system and weeping wall
To accurately determine the cause, it is necessary to conduct a visual and technical inspection. In models Atlant with a system No Frost in the refrigerator compartment, snow most often indicates that the water from the evaporator drain (located in the freezer or behind the panel) does not leave, but is blown by the fan back into the chamber in the form of ice chips. This happens if the drainage hole is clogged with food particles or ice.
If you have a model with a “crying wall”, pay attention to the nature of the ice. A uniform thin layer of frost that periodically melts and drains is the norm. But if you see local “icicles” or ice islands, this is a sign that cold air is blowing directly onto the wall due to an incorrectly installed shelf or products pushed close to the back panel. Air circulation should be free.
It is important to check the operation of the fan blowing In refrigerators Atlant it is located behind the rear panel of the freezer (or common panel). If when you open the door (and press the closing button) you do not hear the characteristic air noise, the fan may be blocked by ice. This often happens when the defrost sensor malfunctions: ice freezes on the blades and blocks rotation.
☑️ Primary diagnosis
Diagnostics of the electronic module requires caution. If the display (on electronic models) shows alarm indicators or blinking lights, this is an error code. Decoding codes for Atlant often indicates problems with temperature sensors. For example, an error in the evaporator sensor is directly related to the formation of snow.
Failures of defrost sensors and heating elements
The most technically complex, but common cause is the failure of defrost system components. In refrigerators Atlant the chain is responsible for this process: TEN (heater), defrost sensor (defrost thermostat) and thermal relay (overheating protection). If the heating element burns out, the ice on the evaporator does not melt. Over time, this ice lump blocks the air supply channels, and the cold stops flowing into the chamber, or (in the case of holes in the ice) the air begins to blow directly, blowing out snow crumbs.
The defrost sensor is a small part that monitors the temperature of the evaporator during the defrost cycle. He should turn off the heating element when the ice melts so as not to overheat the plastic. If it “lies” or does not close the circuit, the control module does not give the command to turn on the heating. The sensor is checked with a multimeter: at room temperature its resistance should be in a certain range (usually several kOhm), and when heated it should change.
| Component | Fault symptom | Test method |
|---|---|---|
| TEN defrost | The ice on the evaporator does not melt, there is no characteristic crack during defrosting | Testing for a break with a multimeter |
| Defrost sensor | The refrigerator does not go into defrost mode or gets too hot long | Measuring resistance at different temperatures |
| Thermal relay | Protective shutdown of heating element, open circuit | Checking circuit conductivity |
| Timer defrosting | Defrost cycles do not occur at all | Mechanical turning or checking signals |
⚠️ Attention: When replacing heating elements or sensors in refrigerators Atlant be sure to use original spare parts or complete analogues. Installing elements with a different power can lead to melting of the plastic evaporator box or a fire.
Often, along with the heating element, the thermal relay also fails. It stands in the circuit break and serves as a fuse. If the heating element shorts out or overheats, the relay breaks the circuit forever. Therefore, when a burnt-out heating element is detected, the thermal relay must be replaced preventively, since its resource may be exhausted after a temperature jump.
Problems with the seal and air damper
Mechanical faults are often ignored by users who look for a problem in electronics. However air supply damper (damper) is a common cause of local freezing. It is a plastic curtain with an electric drive or a thermomechanical regulator. If the damper actuator is burned out, it may become stuck in the open position. As a result, air with a temperature of -18°C and below enters the refrigerator compartment Atlant , instantly freezing the moisture.
The door sealing rubber requires regular maintenance. Over time, grease and dirt accumulate in the folds, preventing a tight fit. In addition, the rubber may dry out. Check the entire perimeter of the door. Pay special attention to corners and folds. If the door is skewed (for example, due to the fact that the refrigerator is not level), then on one side there will be a gap through which air will be sucked in.
How to adjust the damper?
In some Atlant models, the damper can be temporarily fixed in a half-closed position by placing a piece of foam rubber to check whether the snow disappears. However, this is a temporary measure until the drive is replaced.
The influence of humidity in the room also cannot be discounted. If the refrigerator is in a kitchen with high humidity (cooking, drying clothes), then every time the door is opened a lot of moisture gets inside. If the drainage hole works slowly (clogging begins), then some of the moisture does not have time to escape and freezes on the wall. Regular drainage cleaning is a mandatory preventative procedure.
Instructions for defrosting and removing ice
If you find a snow coat, the first step should be complete defrosting. Do not try to chip the ice with a knife or sharp objects - in refrigerators Atlant the evaporator is often foamed very close to the plastic, and a puncture in the wall will lead to a freon leak and costly repairs. Unplug the appliance, open the doors and leave for at least 12-24 hours. This is necessary so that the ice melts in all hidden channels.
During defrosting, be sure to clean the drainage hole. It is located at the bottom of the rear wall of the refrigerator compartment. Use a special stick (usually included) or soft wire/brush. Rinse the canal with warm water using a syringe or syringe. Make sure that water flows freely into the tray above the compressor (located at the bottom of the back, you need to remove the protective cover).
After complete defrosting and drying, turn on the refrigerator. If after 1-2 days snow appears again in the same place, there is a technical problem (sensor, heating element, damper). If snow does not appear, the reason was a regime factor (frequent opening, hot products, a loosely closed door).
If ice appears again, you will need to disassemble the rear panel in the freezer (to access the evaporator). This action requires skill: you need to remove the shelves, unscrew the screws, and carefully snap off the plastic clips. Under the panel you will see the evaporator. If it is covered in ice, but the chamber is clean, it means that the fan is not driving out the cold due to an ice plug. You need to carefully (with a hairdryer, not an open fire!) melt the ice on the evaporator and check the rotation of the fan.
Prevention and operating rules
To avoid the re-formation of snow, you should follow the rules for operating the equipment Atlant. Do not place hot or warm foods in the chamber - they produce a huge amount of steam, which instantly condenses and freezes. Cover liquid foods with lids. Make sure that the food does not touch the back wall, leave a gap of 2-3 cm for air circulation.
Regularly (every six months) check the cleanliness of the condenser (the grille at the back of the refrigerator). If it is clogged with dust and animal hair, heat exchange is disrupted, the compressor overheats, and the efficiency of the entire system decreases, which can indirectly affect the temperature regime and moisture removal. Also wipe the door seal with a damp cloth.
⚠️ Attention: Do not install the refrigerator Atlant close to the wall or in a niche without gaps. For normal operation, the heat exchange system requires free air circulation around the body (at least 5-10 cm from walls and furniture).
Timely maintenance extends the life of equipment. If you notice that the refrigerator begins to work longer, turns on more often, or moisture has appeared inside, do not expect an ice clod to form. Early diagnosis saves money on repairs and keeps food fresh.
Frequently asked questions (FAQ)
Why does snow appear only in the upper part of the refrigerator?
This is a characteristic sign of a malfunction of the air supply damper or a circulation problem. Cold air is heavier than warm air, but when the fan operates, it is supplied from above. If the damper does not regulate the flow, cold air from the freezer will directly hit the top of the back wall, causing localized freezing. Also check whether the products are not moved too close to the ceiling of the chamber.
Is it possible to operate a refrigerator with snow on the wall?
For a short time - it is possible, but not recommended. Snow and ice are thermal insulators. If the evaporator is clogged with ice, the cooling efficiency drops, the compressor works without interruption, trying to gain temperature. This leads to overheating and increased energy consumption. In addition, when a large volume of ice melts, the water may not have time to go into the drainage and will flow onto the floor or into boxes with vegetables.
How long does it take to defrost the Atlant for all the ice to go away?
For high-quality removal of ice from the hidden channels of the system No Frost a minimum of 12 hours is required, or better yet - 24 hours. Rapid defrosting in 2-3 hours often leaves ice plugs in the depths of the case, which will cause a malfunction again after a couple of days. Do not rush the process.
Why did the snow appear again within a day after defrosting?
This is a 100% sign of a technical malfunction. Most likely, one of the elements of the defrost system (heating element, sensor, relay) does not work or the air damper does not close. In this case, simple defrosting will not help - diagnostics and replacement of the faulty part by a technician is required.
How to check whether the defrosting heating element is working without disassembling?
Indirectly - by operation. If the refrigerator is freezing, but there is a thick layer of ice on the evaporator (visible after removing the panel), and the compressor runs jerkily, the heating element is probably not heating. You can accurately check only with a multimeter, reaching the contacts of the heating element, or by monitoring the electricity consumption at the time of defrosting (if there is a smart socket), but this requires electrical knowledge.