Owners of reliable Belarusian equipment often face a situation when a dense crust of ice or a snow “coat” appears on the inner surface of the refrigerator compartment. This symptom seems especially alarming in models equipped with the No Frostsystem, where there should be no ice by definition. However, even in classic static systems or combined models Atlant with two compressors, this process can go beyond the norm.
A violation of the temperature regime in two-compressor units is always a signal of desynchronization of the operation of units or failure of one of the elements of the control system. Unlike single-circuit models, here each circuit (freezer and refrigerator compartments) operates independently, which complicates diagnostics, but narrows the range of possible causes. If you notice that rear wall is covered with a layer of frost that does not have time to thaw, you must react immediately to avoid compressor breakdown.
In this article we will analyze in detail the physics of the process, technical reasons and action algorithms that will help you understand whether you need to call a technician or the problem can be fixed on your own. Understanding the operating principles of your refrigerator refrigerator is the first step to its long life.
The principle of operation of a two-compressor cooling system
To understand why icing occurs, you need to clearly understand how your unit works. The two-compressor Atlant refrigerator equipped with two independent refrigerant circuits. This means that one compressor is responsible for cooling the freezer compartment, and a second one for the refrigeration compartment. This scheme is considered more energy efficient and allows you to set independent temperature conditions.
In models with a system No Frost or Low Frost cold air is forced to circulate using fans, and moisture is removed through the evaporation system. The back wall in such models serves only as a decorative element or a channel for air ducts, and freezing on it indicates a violation of the tightness or defrosting failure. In static models (crying evaporator), the back wall itself is an evaporator, and the periodic appearance of ice is normal for it, but only during the operating cycle.
The key point is cyclicity. The compressor turns on, pumps out refrigerant, the wall cools, the moisture condenses and freezes. Then there is a pause, the wall heats up, and the condensate flows into the drain. If this cycle is disrupted, the ice does not have time to melt and accumulates in layers.
Violation of the tightness of the seal and door hinges
One of the most commonplace, but common causes of excessive ice freezing is the ingress of warm, moist air from the room into the chamber. When warm air comes into contact with the cold back wall, instantaneous crystallization of moisture occurs. In two-compressor models, this effect can be localized only in one of the chambers.
The main culprit here is rubber seal the door cuff. Over time, rubber loses elasticity, cracks or deforms. Even a microscopic gap of 1-2 millimeters can let in enough air to form an ice crust. Also, the problem may lie in skewed doors, which often happens when the shelves are improperly transported or overloaded.
- ❄️ Visual inspection: carefully check the seal around the entire perimeter for cracks, tears or areas where the rubber does not fit tightly to the body.
- 🚪 Test with paper: pinch a sheet of paper with the refrigerator door and try to pull it out. If the paper is removed without resistance in different places, the seal is broken.
- 📐 Checking the geometry: make sure that the door is not warped. The gaps between the door and the body should be the same at the top and bottom.
If you find a loose fit, first try simply washing the seal with warm water and soap to remove any grease that could interfere with adhesion. If this does not help, you may need to replace the cuff or adjust the hinges.
How to replace the seal correctly?
Replacing the seal requires heating the new cuff (with a hairdryer or hot water) to make it elastic before installing it in the groove. It is also important to check the corner joints, since this is where cracks most often form.
Defrost system malfunctions (for No Frost models)
If your Atlant equipped with an automatic defrost system, then ice freezing on the back wall of the refrigerator compartment or on the floor of the freezer is almost guaranteed to indicate a failure in the circuit defrost. The system consists of three main elements: a heater (heating element), a defrost sensor (thermostat) and a timer (or electronic control module).
In normal operation, after a certain number of cooling cycles, the system switches the refrigerator to defrost mode. Turns on Evaporator heating elementwhich melts the ice on the hidden evaporator. If one of the elements of this chain fails, the ice does not melt, but grows, gradually blocking the cold air supply channels. As a result, the fan begins to hum, touching the ice mass, and the temperature in the chamber rises.
Diagnostics requires testing the elements with a multimeter. Most often, the heating element itself burns out or the sensor contacts become sour. In electronic models Atlant with a display, a malfunction may be indicated by a flashing indicator or error code.
⚠️ Attention: Before checking the electrical circuits, be sure to unplug the refrigerator! Working with electrical appliances under voltage is dangerous to life.
☑️ Diagnostics of the defrosting system
Failures operation of the thermostat and sensors
The thermostat (thermostat) is the “brain” that decides when to turn the compressor on and off. In two-compressor models there are two of them: one for the refrigerator compartment, the other for the freezer. If the thermostat “sticks” in the “On” position or begins to transmit incorrect readings, the compressor operates without interruption.
Continuous operation leads to deep freezing of the rear wall. In static refrigerators, condensation turns into ice and does not have time to drain into the drainage hole. In models No Frost this causes freezing of the air ducts. Often the cause is not a breakdown of the sensor itself, but its displacement: the capillary tube of the thermostat could move away from the evaporator, which is why it does not feel the real temperature.
Modern models Atlant use electronic temperature sensors that transmit data to the control module. Failure of such a sensor (open circuit or change in resistance) leads to the fact that the “brain” of the refrigerator receives false information about the heat inside and causes the compressor to wear out.
Clogged drainage system
Even if the cooling and defrosting system works perfectly, ice can accumulate due to a simple blockage. Water formed during condensation or thawing must go through the drainage hole into a special container above the compressor. If this path is blocked, the water has nowhere to go and freezes, forming an ice plug.
The blockage can be caused by food crumbs, mold, or simply a clot of mucus. In dual-compressor models, the drainage systems of the chambers are often independent, so the problem may occur in only one of them. An ice blockage in the refrigerator compartment drainage causes water to accumulate at the bottom and freeze at the back wall.
For cleaning, you can use a special soft wire or a syringe with warm water. Do not use sharp metal objects to avoid damaging the plastic or internal tubes.
| Symptom | Probable cause | Nature of freezing |
|---|---|---|
| Ice only at the bottom of the rear wall | Clogged drain holes | Water stands in a “lake” and freezes |
| Uniform “coat” over the entire wall | Thermostat malfunction / Seal | Dense layer of frost or ice |
| Ice in the freezer, cold in the refrigerator | Failure of the defrost system (No Frost) | Ice block on the evaporator (hidden) |
| Ice in uneven spots | Seal leakage | Build-ups in places where air leaks |
Problems with the refrigerant and compressor
The most serious technical malfunctions are associated with a violation of the tightness of the refrigerant circuit. If there is a freon leak in the system, the pressure drops and the refrigerant begins to boil earlier than expected. This leads to local supercooling of individual sections of the tubes, which causes increased freezing of ice precisely at the leak site or at the outlet of the capillary tube. Atlant a freon leak occurs, the pressure drops, and the refrigerant begins to boil earlier than expected. This leads to local supercooling of individual sections of the tubes, which causes increased freezing of ice precisely at the leak site or at the outlet of the capillary tube.
Partial blockage of the capillary tube (for example, with oxidation products or moisture) gives a similar effect. The compressor tries to pump gas, but encounters resistance, which leads to the formation of an ice plug (“crying condenser” or ice on the tube at the entrance to the evaporator). In two-compressor models, this often leads to one compressor running idle or overloaded.
It is almost impossible to diagnose a leak or blockage at home. Professional equipment is required: leak detector, pressure gauge station and vacuum pump. Independent attempts to “add freon” without looking for a leak will only temporarily solve the problem, and the compressor will quickly fail.
⚠️ Attention: If you hear gurgling, hissing or see oily spots on the floor under the refrigerator, these are signs of depressurization of the circuit. The operation of such a device is dangerous and ineffective.
The influence of external factors and operating mode
You should not discount the conditions in which the equipment is operated. Atlant refrigerator, like anyone else, is sensitive to the environment environment. If the unit is installed too close to a wall, radiators or in direct sunlight, the heat dissipation efficiency of the condenser will decrease. The compressor is forced to work longer, which can lead to failures in the defrost cycle.
It is also critically important what exactly and how you load into the chambers. Serving hot dishes, storing open containers with liquid without lids, and frequently opening the door in a hot room - all this dramatically increases the humidity inside. The system simply does not have time to remove excess moisture, and it settles on the coldest surface - the back wall.
It is important to observe the temperature regime. Setting the regulator to maximum (“Super Freeze” or value 7) in normal mode leads to freezing. In two-compressor models, this is especially true for the refrigerator compartment, where temperatures below +2°C already lead to freezing of food and water on the wall.
Frequently asked questions (FAQ)
Is it possible to operate the refrigerator if there is ice on the back wall?
Short-term operation is possible, but undesirable. The prolonged presence of an ice crust increases the load on the compressor, disrupts heat transfer and can lead to deformation of plastic elements or failure of the defrost system. It is better to eliminate the cause.
How long does it take to defrost a two-compressor Atlant?
To completely defrost and equalize the pressure in the system, it is recommended to disconnect the refrigerator from the network for at least 12 hours, and preferably for 24 hours. Two-compressor models have a more complex system of tubes, and they need time to completely move away from the ice.
Why does ice freeze in only one chamber?
In two-compressor models, the chambers are independent. A problem with the seal, thermostat or defrost system can occur in only one circuit (for example, only in the freezer), while the second one is working properly.
Do you need to pick at the ice with a knife to remove it?
Absolutely not! Mechanical removal of ice with sharp objects can damage the evaporator (especially in static models, where it is located behind a plastic panel or is the wall itself). Damage will lead to immediate release of freon and costly repairs. Only natural defrosting.