The situation when the refrigeration unit is humming, the compressor is running, but the upper chamber has stopped cooling is classic for equipment from the Belarusian manufacturer. Users often encounter the fact that food in the main compartment begins to deteriorate, the temperature rises above normal, and there is no frost on the walls or, conversely, a fur coat forms. Owners of models Atlant with a two-chamber system and one compressor should understand that impaired refrigerant circulation is just the tip of the iceberg.
Ignoring the problem at an early stage can lead to failure of an expensive compressor or the need to completely replace the cooling system. In this material we will analyze in detail the mechanical and electrical causes of the malfunction, self-diagnosis methods and action algorithms that will help restore the device’s functionality. It is important to act consistently so as not to aggravate the situation with improper intervention.
Before you start disassembling or calling a technician, it is necessary to eliminate trivial operating errors. Often the reason lies not in a breakdown, but in a violation of the rules of loading or temperature conditions. Careful analysis preceding events will help save time and money on repairs.
Violation of the rules of operation and placement of products
The most common reason why cooling stops the upper chamber is trivial - a violation of air circulation. Cold air in refrigerators Atlant with a system No Frost or static cooling should move freely between the shelves. If you tightly crowd the shelves with pots, close the ventilation holes on the back wall, or place hot foods, the natural convection flow is blocked.
Particular attention should be paid to the rubber door seal. If it is dirty, damaged or does not fit tightly to the body, warm air from the room constantly enters the chamber. The compressor tries to compensate for heat loss by working non-stop, but due to the high heat capacity of air and moisture, it simply does not have time to cool the volume to the specified values. Check the tightness of the seal by pressing a piece of paper between the door and the body: if it is easily removed, the seal requires replacement or adjustment.
It is also important to check the temperature settings. In the summer, when the room is hot, the thermostat may not cope if it is set to minimum cooling. For models with electronic control, it is worth checking whether the “Super Freeze” or “Vacation” mode is disabled, which can affect the operation of the evaporator.
- ❄️ Check that the air ducts between the freezer and refrigerator compartments are not blocked by food.
- 🚪 Assess the tightness of the door and the cleanliness of the magnetic seal around the entire perimeter.
- 🌡️ Make sure that the thermostat is set to the correct position (usually 3-4 divisions for mechanics).
- 🥘 Do not place hot foods in the chamber, which sharply increase the internal temperature and humidity.
⚠️ Attention: If the refrigerator is installed close to wall or into a niche without gaps, the heat transfer of the condenser is disrupted. Leave at least 5-7 cm of free space at the back and sides of the unit for normal operation.
In some cases, the problem may be due to seasonal changes. If in the room where the refrigerator is located the temperature drops below +10°C (for example, on an unheated loggia in winter), the compressor may not start due to frozen oil or the operating characteristics of the thermostat. Make sure that the operating conditions comply with the technical data sheet of the device.
Malfunctions of the defrost system and the formation of ice jam
For models Atlant with a system No Frost or drip defrost system, a critical element is the timely removal of moisture from the evaporator. If the defrost system fails, a massive layer of ice builds up on the evaporator located behind the back panel of the freezer. This ice blocks the fan and blocks the channels for supplying cold air to the upper chamber.
Visually you may not see the ice, since it is hidden by plastic casing. An indirect sign is that the freezer is working normally (or even freezing too much), and the refrigerator compartment is warm. The fan hums, but no air passes through the ice monolith. In such cases, complete defrosting of the unit is required.
How to properly defrost an Atlant refrigerator?
Unplug the appliance, open all doors and leave for at least 12-24 hours. Do not use a hair dryer or hot water to speed up the process - this may damage the plastic and evaporator tubes. Make sure that melt water does not get on the electrical components.
If after a long defrosting (more than a day) the refrigerator worked normally, but after 1-2 weeks the problem recurred, it means that one of the elements of the defrosting system is faulty. This may be Defrosting heaterthat is burned out and does not heat, thermostat defrostthat does not give a command to turn on the heating, or timer/control unitthat does not initiate the defrost cycle.
☑️ Diagnostics of the defrost system
Replacing the heating element or thermostat is a procedure that requires disassembling the freezer chamber and removing the back panel. Before replacing, be sure to test the parts with a multimeter. The resistance of a working heating element is usually several hundred Ohms, and the thermostat should “ring” at room temperature.
Problems with the fan and air circulation
In refrigerators Atlantequipped with a forced air circulation system, the fan located in the freezer is responsible for moving cold masses. If it stops rotating, cold air is not pumped into the upper compartment, and the temperature there quickly rises to room temperature.
The reasons for the fan stopping can be mechanical or electrical. Often the blades freeze to the body due to heavy snow deposits, or moisture and dirt get into the bearing, causing jamming. In other cases, the motor winding burns out or the contact in the power circuit is broken.
For diagnostics, you need to remove the plastic panel in the freezer (usually it is located behind the drawers). When the refrigerator door is open (and the freezer is closed, if there is a sensor), the fan should work. If he is silent, try gently twisting the paddle with your finger (being careful!). If after this it works, the problem is freezing or wear of the bearing.
- 🔇 Listen: listen to whether the fan makes extraneous sounds (grinding, humming) before stopping.
- 🧊 Check whether frozen ice is interfering with the rotation of the blades.
- ⚡ Ring the windings of the fan motor for breaks.
- 🔌 Check for voltage at the connection terminals when the compressor is running.
If the fan is working, but no air flows, check the air duct damper. In some models Atlant with electronic control, the damper is controlled by an electric drive and may jam in the closed position. The mechanical damper may be clogged with food or ice.
Freon leakage and clogged capillary system
The most serious technical malfunctions leading to a lack of cold in the upper chamber are associated with impaired refrigerant circulation. If freon leakhas formed in the system, its quantity becomes insufficient for effective cooling of the entire volume. In two-chamber refrigerators with one compressor, the refrigerant first passes through the freezer compartment, and then through the refrigeration evaporator.
If there is a partial leak, the freezer may still freeze (albeit worse), and in the upper compartment the temperature will be positive. A characteristic sign of a leak is overheating of the condenser (grid at the back) only at the beginning or, conversely, its cold state, as well as the absence of the characteristic noise of flowing liquid in the tubes.
Another common problem is clogged capillary tube. An ice or oil plug may form in the narrow channel of the capillary, or debris may enter. This prevents the normal flow of freon. The pressure in the system increases, the compressor is overloaded, but the cooling capacity drops. Often, when clogged, the condenser is only half hot, and the rest of the tubes remain cold.
| Symptom | Probable cause | Characteristic symptom | Difficulty of repair |
|---|---|---|---|
| The freezer is freezing, the top is warm | Freon leakage | Bloating of the wall, lack of frost | High (need sealing) |
| Compressor is hot, humming | Capillary clogged | Tubular condenser is partially warm | High (needs purge) |
| Frost only at the entrance of the tubes | Lack of refrigerant | Uneven cooling of the evaporator | Medium (refilling) |
| The refrigerator does not turn on | Compressor failure | Relay clicks, no start | High (replacement of unit) |
It is impossible to independently eliminate a leak or blockage without specialized equipment (vacuum pump, pressure gauge station, burner). These works require a skilled technician and a license to work with refrigerants.
⚠️ Attention: The use of “plugs” and sealants to eliminate leaks at home is a temporary solution, which often leads to complete blockage of the system and failure of the compressor after a short time.
Malfunctions of the thermostat and sensors
Responsible for maintaining the set temperature thermostat (in mechanical models) or air sensor (in electronic ones). If this element fails and shows incorrect data, the control unit may “think” that the chamber is already cold and does not turn on the compressor or open the damper.
In models Atlant with mechanical control The thermostat is often located inside the chamber or behind a plastic cover. Its sensitive capillary tube must be in close contact with the evaporator or air. If the tube has moved or the sensor is lying, the refrigerator will not work correctly. You can check it by closing the contacts (to diagnose the operation of the compressor) or ringing with a tester when the temperature changes.
In electronic models Atlant (XM, KXM series), a control module that reads sensor readings is responsible for all processes. If the temperature sensor in the refrigerator compartment is faulty, an error may appear on the display or the temperature indicator may flash. Replacing the sensor is usually not difficult, but requires selecting an analogue with the appropriate resistance.
Sometimes the problem lies not in the sensor itself, but in the oxidation of the contacts in the connection connector. This is a common occurrence in high humidity conditions. The connectors should be cleaned with alcohol and treated with contact spray.
Failure of the compressor and start relay
The heart of the refrigerator is compressor. If it doesn't start, there won't be any cold anywhere. However, there is a situation when the compressor works, but does not create enough pressure to pump freon through both circuits. This is called "loss of productivity". In this case, the freezer may barely freeze, but the upper chamber will remain warm.
Often the culprit for starting problems is start-protective relay. It protects the motor from overloads and helps start the rotor. If the relay clicks but does not start, or it is burned out (blackening is visible or a burning smell is heard), replacing it will solve the problem. The relay is a consumable item and is inexpensive.
If the compressor hums, heats up, but does not start, or starts for a couple of seconds and stalls with a click, the piston group may have jammed or the winding has burned out. In this case, only replacing the compressor with a new one will help. Old models Atlant often were equipped with reliable motors that last for decades, but their resource is not endless.
- 🔊 Clicking when turned on and silence - most likely a problem with the relay or a jammed compressor.
- 🔥 Strong heating of the motor housing during operation indicates an interturn short circuit or runaway operation.
- 💨 The absence of vibration on the output tube of a working compressor indicates a loss of compression.
- 🔌 Check the network voltage: if the voltage is low, the compressor may not start.
When replacing the compressor, it is also necessary to replace the filter drier and perform high-quality vacuumization of the system. Residual moisture in the system is the main cause of repeated breakdowns.
Frequently asked questions (FAQ)
How long should defrosting last if an ice plug has formed?
For complete thawing of ice in hidden channels and on the refrigerator evaporator Atlant minimum 24 hours required. It's not enough to just turn it off at night. An ice plug in the condensate drain channel or between circuits can flow for a very long time. Make sure that water has stopped dripping from the drainage hole before turning on the unit again.
Is it possible to temporarily use the refrigerator if the upper chamber does not work?
You can use the refrigerator in this mode only for a short time and with caution. Food in the upper chamber will quickly spoil. In addition, if the cause is a leak or the compressor running without load, this can lead to overheating and eventual failure. It’s better to unload the food and start making repairs.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrosting system (heating element, thermostat or timer). Defrosting removes the effect (ice), but not the cause (non-heating heating element). After a week of work, the ice builds up again and blocks the channels. It is necessary to ring the elements of the defrost circuit and replace the defective one.
How to understand that the refrigerator has run out of freon?
Main signs: the condenser (grid at the back) is cold or warm only at the compressor, the absence of characteristic gurgling in the tubes, swelling of the side walls (the place where the evaporator is sealed), and also the fact that the compressor works almost without stopping, but the temperature does not drop.
Is it worth changing the thermostat yourself?
If you have the skills to work with a tool and a multimeter, replacing a mechanical thermostat in Atlanta is quite affordable. The main thing is to buy a similar model with the same capillary tube length and temperature range. In electronic models, replacing sensors is also simple, but requires care with connectors.