The situation when your Atlant refrigerator works without interruption, ignoring commands to turn off the compressor, is one of the most alarming signals for the owner of household appliances. The constant hum of the engine not only irritates the ear, but also indicates that the cooling system cannot reach the specified temperature parameters. As a result, the unit operates non-stop, trying to cool the internal volume, but physically cannot cope with the heat flow due to a malfunction.
Ignoring this problem inevitably leads to critical overheating of the electric motor windings and failure of the expensive compressor. Often, owners notice that refrigerator compartment it has stopped freezing properly, or, conversely, the food in it begins to freeze, turning into ice blocks. Understanding the reasons for this behavior of equipment is the first step to saving the device from major repairs or complete replacement.
In this material we will analyze in detail the mechanical and electrical causes of failure of operating cycles. You will learn how to independently carry out initial diagnostics, check thermostat and determine whether a technician’s intervention is required to charge refrigerant or replace seals.
Operation principle and symptoms of malfunction
Normal cycle of operation of refrigeration equipment is based on alternating periods of activity and rest. The compressor turns on when the sensor detects an increase in temperature above the set threshold, and turns off when the desired cold is reached. If Atlant refrigerator does not turn off, this means that the sensor either does not see the temperature reached, or the cooling system is ineffective and cannot cool the chamber to the required values.
The first and most obvious symptom is a hot case. The side walls or rear grille may become hotter than usual because the compressor is working at its limit, pumping refrigerant continuously. This creates excess heat generation, which does not have time to dissipate into the environment.
Another sign is the formation of a “snow coat” or ice on the back wall of the refrigerator compartment, even in models with the No Frost system (although Atlants are characterized by a drip system, where ice is a clear sign of a failure). It is also worth listening to the sound of operation: the motor may hum more smoothly and loudly, without characteristic pauses, which usually last from 10 to 40 minutes depending on the load and ambient temperature.
⚠️ Attention: If you smell a burning smell or see that the wiring near the compressor has melted, immediately turn off the power to the device. Further operation in this condition poses a risk of fire.
It is important to distinguish between situations when the refrigerator simply freezes for a long time after the first load of food, and when it is really broken. After defrosting or filling an empty chamber with equipment, it takes time to enter the mode. However, if the unit hums for days without a break, we are talking about a technical malfunction.
Problems with the thermostat and temperature sensors
The most common reason for continuous operation Atlant refrigerator is the failure of the thermostat (thermostat). This mechanical or electronic component is responsible for breaking the compressor's power supply circuit. If the contacts inside the thermostat are “stuck” in the closed position or the bellows tube fails, the signal to turn off the motor is simply not received, and it continues to pump freon.
In models with electronic control, temperature sensor (thermistor) is responsible for this function. Its resistance changes depending on the degrees in the chamber. If the sensor “lies” and shows the controller that it is +15°C inside, although in reality it is already -5°C, the electronics will keep the compressor on. Replacing this element often solves the problem, but requires accurate diagnosis with a multimeter.
Sometimes the problem lies not in the part itself, but in incorrect adjustment. If you accidentally set the “Super Freeze” mode or maximum cold, the refrigerator will work non-stop as intended by the engineers. Check the position of the regulator: for standard mode, the knob should be in the middle position or on division 2-3.
How to check the thermostat without instruments?
Remove the thermostat and immerse its sensitive tube in a container with cold water (about 3-5 degrees). If a click and opening of the contacts does not occur after 1-2 minutes, the part is faulty and requires replacement.
It is worth noting that in Atlant two-chamber models a separate thermostat is often installed for the refrigerator compartment. If it is faulty, the freezer can work normally, but the upper compartment either freezes, or, conversely, does not keep the cold while the motor hums without interruption.
Refrigerant leakage and failure of the circuit tightness
If thermostat it is working and gives signals to shut down, but the compressor ignores (more precisely, the system does not give a command to stop due to high temperature), which means that the refrigerator cannot get cold. The most common cause is a freon leak. The refrigerant circulates in a closed circuit, and if a microcrack has formed in the tubes, the gas gradually comes out.
When the amount of freon decreases, the pressure in the system drops. The compressor continues to work, trying to compensate for the lack of refrigerant and cool the chambers, but the efficiency of this process tends to zero. As a result, the motor wears out, and the temperature inside remains high.
It is difficult to visually determine a leak, since freon is colorless and odorless. However, indirect signs can be:
- 🧊 Lack of cold in one or both chambers when the engine is running.
- 🔥 Excessive heating of the compressor (it can be hot to the touch, even impossible to touch).
- 💧 The appearance of oily spots near condenser or evaporator tubes (freon comes out along with the compressor oil).
- 🔊 Change in the sound of the engine (a whistle or hiss may appear).
⚠️ Attention: Independent refilling with freon is impossible without special equipment and skills. An attempt to simply “add gas” without finding and eliminating the leak will lead to the gas coming out again after a short time.
Often leaks occur in places where tubes are soldered or in the foamed part of the housing (evaporator), which requires complex repairs with the thermal insulation bulkhead. In some cases, repairs are not economically feasible.
Wear of sealing rubber bands and heat loss
The refrigerator Atlant may not turn off if it cannot keep the cold inside. The sealing of the chamber is ensured by a magnetic seal (elastic band) around the perimeter of the door. Over time, the rubber dries out, cracks, deforms, or simply becomes contaminated with grease, causing the door to not fit tightly.
Warm air from the room constantly enters the cracks formed. The temperature sensor detects the heating and commands the compressor to turn on. Once the cold is built up, warm air flows back in and the cycle repeats endlessly. Visually this may not be noticeable, so a check is required.
You can check the tightness of the seal with a simple test with a sheet of paper. Clamp the sheet with the door in different places around the perimeter. If the paper falls out or is pulled out without force, the seal is broken. You can also use a flashlight: turn it on inside a closed refrigerator in the dark; if light breaks through the cracks, the seal requires replacement.
☑️ Diagnosis of the seal
Replacing the seal is a procedure that you can do yourself if you find a suitable spare part for your model Atlant. Sometimes restoring the shape of an old rubber band using boiling water or a hair dryer helps, but this is a temporary measure.
Malfunctions of the compressor and start relay
The most expensive breakdown is the failure of the very heart of the refrigerator - the compressor. If the piston group is worn out, the valves have lost their tightness or the winding has burned out, the engine may not operate correctly. In the event of an interturn short circuit of the windings, the motor may continue to hum, but not create the necessary pressure for freon circulation.
It is also worth paying attention to the start-up relay. This small block on the compressor housing is responsible for starting the engine and protecting against overloads. If the relay is “stuck” or its contacts are burnt, it may not break the circuit, leaving the compressor constantly energized, which leads to its rapid overheating and combustion.
Symptoms of problems with the compressor are often similar to a freon leak, but there are differences:
- 🔨 The motor hums, but the nature of the work is different (metallic knocking, vibration).
- 🌡️ The compressor is very hot, but the condenser tubes remain cold.
- ⚡ Frequent attempts to start followed by a click and stop (if the protection is triggered).
It is better to entrust the diagnosis of the compressor to a specialist, since it requires measuring winding resistance and checking system pressure. Replacing the compressor yourself requires soldering the tubes and evacuating the system, which is impossible without professional tools.
The influence of external factors and operating conditions
Sometimes the reason for this is that refrigerator compartment does not turn off lies not in a breakdown, but in incorrect operating conditions. A refrigerator is a heat pump that transfers heat from inside to outside. If this process is interfered with, efficiency drops and the motor runs without interruption.
A critical factor is the temperature in the room. If the refrigerator Atlant is located next to a radiator, stove or in direct sunlight, the heat gain is too great. Also, you cannot place the unit close to the wall: to cool the condenser, a gap of at least 5-10 cm is required for air circulation.
Another common mistake is loading hot products. If you put a pot of soup in the chamber, the refrigerator will be forced to work in intensive mode for several hours until it cools the volume to the set temperature. This is normal, but abuse of this mode reduces the service life of the equipment.
Below is a table that helps systematize symptoms and probable causes:
| Symptom | Probable cause | Difficulty of repair | Required actions |
|---|---|---|---|
| The engine is humming, there is no cold | Freon leak or compressor failure | High | Call a technician to find a leak |
| The motor does not turn off, there is ice in the chamber | The thermostat or sensor is faulty | Medium | Replacing the thermostat |
| Works constantly, but freezes weakly | Wear of the seal, leakage | Low | Replacement or restoration of the rubber band |
| Buzzes only during the day or in the summer | High room temperature | No | Move to a cooler place |
⚠️ Attention: Technical specifications and design features may vary depending on the specific model and year of manufacture. Always check the manufacturer's instructions for your device.
Frequently asked questions and answers (FAQ)
How much time should the Atlant refrigerator operate without stopping normally?
In normal mode, the operating cycle (on + off) ranges from 30 to 60 minutes. Compressor operating time usually takes up about 30-40% of the total cycle time. If the refrigerator runs for more than 20 minutes without a break in an empty state at normal room temperature, this is a cause for concern.
Is it possible to use the refrigerator if it does not turn off until the technician arrives?
For a short time - it is possible to preserve food, but leaving it in this mode for a day or more is dangerous. This will cause the compressor to overheat and burn out. If possible, turn off the appliance, defrost it and let the motor cool while you wait for a specialist.
Why does the refrigerator not turn off for a long time after defrosting?
After complete defrosting and loading with food, the refrigerator takes time (from 2 to 6 hours) to return to operating mode. At this time, continuous operation of the compressor is a normal situation. If after 6-8 hours the cycles have not returned to normal, look for a malfunction.
Does the amount of food affect the operating time of the refrigerator?
Yes, a full refrigerator keeps the cold better, since the products act as cold accumulators. However, when loading a large volume of warm food for the first time, the operating time before the first shutdown will increase significantly. An empty refrigerator can also work longer due to the small thermal volume.
What to do if the thermostat is working, but the refrigerator still does not turn off?
If the thermostat clicks and opens the circuit, but the compressor continues to hum, then the problem is in the start relay (contacts are stuck) or in the compressor itself. In this case, it is necessary to urgently de-energize the device, since there is a high risk of fire in the wiring or motor.