The situation when you open the refrigerator door, and it’s warm inside, although the unit hums and vibrates, is familiar to many equipment owners Atlant. This is a classic symptom of impaired refrigerant circulation or failure of key components of the cooling system. Compressor may continue to idle, creating the illusion of normal operation while the products begin to deteriorate.
Do not panic if you notice that Atlant refrigerator stopped freeze. Often the problem lies in specific, diagnosable faults that can be identified without sophisticated equipment. Understanding the principles of operation of a dual-circuit system will allow you to quickly navigate the search for a defect.
In this article we will analyze in detail the mechanical and electrical reasons for the lack of cold. We will look at why motor it hums, but does not pump freon, and how to distinguish a banal leak from more serious problems with the control electronics.
Violation of the system tightness and leakage of freon
The most common reason for which Atlant refrigerator hums, but does not freeze - this is a banal refrigerant leak. If a hole has formed in the circuit, freon gradually evaporates, and its pressure becomes insufficient to effectively remove heat from the chambers.
In such cases, the compressor tries to compensate for the lack of gas, working almost without interruption. You may notice that it gets very hot, and the condenser tubes (usually located at the back or sides of the case) remain only partially cold or warm.
Leaks often occur at the solder joints of the tubes or in the evaporator if it has been mechanically damaged. Sometimes the “crying” aluminum evaporator in No Frost models can corrode over time, especially if the water flow is disrupted.
⚠️ Attention: Freon is odorless and colorless, so it is impossible to detect a leak visually without a soap solution or a special leak detector. Do not try to refuel the refrigerator yourself without finding and eliminating the leak.
If the system is leaky, simple refueling will not help - the gas will escape again after a short time. The technician must find the place of damage, solder it, vacuum the system and only after that fill the unit with new refrigerant strictly by weight.
Clogged capillary tube or filter drier
Another common reason for the lack of cold when the compressor is running is a blockage of the narrow capillary tube. Through it, liquid freon is supplied to the evaporator, and if the permeability is impaired, the circulation stops.
The blockage can be caused by oxidation products inside the system, moisture or oil particles. As a result, the compressor creates high pressure in front of the plug, but cannot push the refrigerant further along the circuit.
A characteristic sign of such a breakdown is that the condenser may only be hot at the beginning, while the evaporator remains completely cold. You can also often hear gurgling or hissing, which can appear and disappear.
Is it possible to break through the blockage yourself?
There is a method of “pushing” with nitrogen, but doing this at home is dangerous. The pressure in the system can reach critical values, which will lead to rupture of tubes or damage to the compressor.
To eliminate this malfunction requires replacement filter-drier and purge of the circuit with nitrogen under high pressure. This is a complex procedure that requires specialized equipment and skills in working with refrigeration units.
Malfunction of the motor-compressor
It happens that outwardly engine works: it hums, vibrates, but wear occurs inside it valve group. In this case, the compressor simply does not create the necessary pressure for the circulation of freon.
The valves may become stuck, break, or lose their tightness. The motor hums, the shaft rotates, but the “rocker” does not work. You can check this by disconnecting the discharge tube: if the gas barely comes out or does not come out at all while the engine is running, it means that the compressor has “died.”
Often such a breakdown is accompanied by overheating of the unit housing. Motor it can idle for a long time until a thermal relay turns it off due to overheating, after which the cycle will repeat again.
- 🔥 The compressor is very hot to the touch, but the tubes are cold.
- 🔇 The unit hums louder than usual or makes a metallic clang.
- ⏱️ The refrigerator is working cycles: it hums for 10 minutes, rests for 5 minutes, but there is no cold.
If the compressor valves fail, repair is impossible - a complete replacement of the unit with a new or restored analogue is required. It is important to choose a model with identical power and refrigerant characteristics.
Problems with the No Frost and defrosting system
In models Atlant with the No Frost system, the lack of cold is often associated with a malfunction in the defrosting circuit. If the evaporator becomes overgrown with a “coat” of ice, the air stops circulating and the products are not cooled, although the compressor is working properly.
The cause of the formation of an ice block may be a failure of the Heating element (heater), defrost timer or defrost sensor. The system simply “does not understand” that it needs to turn on the heating and melt the snow.
In such cases, the fan, which is supposed to drive cold air, may be blocked by ice or simply not turn on due to a sensor error. You can hear the motor running, but there is no fan noise coming from inside.
For diagnostics, you need to defrost the refrigerator manually during the day. If after turning it on it starts to freeze, but after a week the problem repeats, it means that one of the elements of the automatic defrosting system is faulty automatic defrost.
Failures in the operation of electronics and sensors
Modern refrigerators Atlant are controlled by electronic modules. If the control board is “buggy” or receives incorrect data from temperature sensors, it may not give a command to turn on the compressor or, conversely, keep it turned on to no avail.
The temperature sensor in the chamber often fails. If it shows that there is cold (even though it is actually warm), the control module will not start the cooling cycle. As a result, the compressor is silent, although it may not be faulty.
Problems with the start-up relay are also possible. If it is stuck or burnt out, the compressor may hum for several seconds, click and turn off without starting. In this case, a characteristic metallic click is heard.
| Symptom | Possible cause | Probability |
|---|---|---|
| It buzzes, but does not freeze, the tubes are warm | Freon leak | High |
| Humming, cold tubes, hot condenser | Capillary clogged | Medium |
| Humming, then a click and silence | Start relay / Compressor wedge | High |
| Works constantly, little cold | Sensor malfunction / Leakage | Average |
Electronics diagnostics require a multimeter and knowledge of the circuit diagram of a specific refrigerator. Errors are often displayed by blinking indicators on the control panel, which can indicate which particular unit requires checking.
Diagnostics and procedure in case of breakdown
If you find that Atlant refrigerator does not freeze, start with a visual inspection and listening. Check if the light is on, if there are any foreign burning odors, if the tubes at the back are evenly heated.
Try to defrost the unit completely (turn it off for 24 hours with the doors open). If after this it works normally for a couple of days, and then stops again, look for a problem in the defrost system (for No Frost) or in a leak.
☑️ Primary diagnosis
Do not try to disassemble the sealed circuit yourself if you do not have a license and equipment to work with freon. Unprofessional intervention can permanently damage the equipment.
⚠️ Attention: Technical characteristics and diagrams of refrigerators may vary depending on the year of manufacture and the specific model. Always check the product data sheet.
To accurately determine the malfunction, it is better to call a technician who will diagnose the pressure in the system and check the electrical circuits. This will save you time and money on purchasing unnecessary spare parts.
Frequently asked questions (FAQ)
Why does the Atlant refrigerator freeze only the upper chamber?
This may indicate a freon leak (there is only gas left for one circuit), a blockage in one of the circuits, or a malfunction of the damper redistribution of cold in models with one compressor.
How long should a compressor work normally?
Normally, the operating cycle is approximately 10-20 minutes of work and 20-40 minutes of rest. If compressor works without stopping for days, this is a sign of overload or leakage.
Is it possible to operate a refrigerator if it does not freeze?
It is strictly not recommended. An idling compressor quickly overheats and can burn out, causing food to spoil. It is better to turn off the device before repair.
What does it mean if the compressor is hot and the refrigerator is cold?
This is normal for a working unit. But if it is heated to the point where you can’t touch it, and there is no cold inside, this is a sign of a malfunction (clogging, leakage, problems with oil).
How can you tell that the compressor has burned out?
If you hear a click when you turn it on, the buzzing lasts 2-5 seconds and then clicks again and turns off, most likely the compressor is jammed or the start relay is faulty.