The situation when the refrigerator Atlant stops turning off is critical for the safety of the products and the unit itself. Continuous operation compressor leads to rapid wear of the motor, excessive energy consumption and, most dangerously, to possible ignition of wiring or melting of internal elements. The owner notices a problem, as a rule, based on two signs: either the unit is humming without interruption, or a “snowball” of ice has formed inside the chamber, and the products have begun to freeze.
It is important to understand that modern models Atlant with the No. Frost or drip defrosting have complex algorithms for controlling cooling cycles. If the cooling cycle is not interrupted, it means it control unit does not receive a signal to reach the set temperature, or physically cannot cool the chamber to the required value due to loss of refrigerant. In older models with electromechanical control, the cause is often sticking of the thermostat contacts.
Ignoring the problem in the first hours may seem safe, but long-term wear and tear reduces the service life of the equipment significantly. Temperature conditions it gets lost, and instead of the required +4°C in the refrigerator there may be -5°C, and in the freezer - extremely low values, which is detrimental to many types of products. Next, we will look at the main causes and diagnostic methods.
Faults of the thermostat and temperature sensors
The most common reason why the refrigerator Atlant does not turn off is the failure of the thermostat (thermostat) or air temperature sensor. In models with mechanical control, a thermostat is responsible for this process, which physically opens the compressor power circuit when the desired cold is reached. If its contacts “stick” in the closed position or the sensitive tube breaks, the compressor will work continuouslyuntil you forcibly turn off the equipment.
In more modern models with electronic control, the control function is performed by air sensors. They transmit data to the control module. If the sensor “lies” and shows that the chamber is +15°C, although in reality it is already -10°C, the “brains” of the refrigerator will command the motor to cool further. Often the problem lies not in the sensor itself, but in oxidation of the contacts on its connector or damage to the wiring.
⚠️ Attention: Before replacing the thermostat, make sure that the problem is not due to incorrect installation of the regulator handle. Sometimes users accidentally set the “Max” or “Super Freeze” mode, forcing the equipment to work without interruption.
Diagnostics of a mechanical thermostat requires a multimeter. It is necessary to “ring” the contacts: at temperatures above the set temperature they should be closed, when cooled (you can put them in cold water) they should open. Electronic sensors are checked by measuring resistance, which should change depending on the temperature according to the manufacturer's table.
How to check a thermostat without instruments?
If you do not have a multimeter, you can carry out a rough check. Disconnect the terminals from the thermostat and connect them directly (being careful!). If the refrigerator then turns on and off normally using a timer (or when turned off manually), then the problem is in the thermostat. However, this method requires electrical skills.
Freon leakage and problems with system tightness
The second most common reason for continuous operation is a refrigerant (freon) leak. When the amount of gas in the circuit decreases, performance the system drops. The compressor operates at full power, trying to catch up with the temperature, but due to the lack of a “working fluid,” the cold is not produced in the required volume. As a result, the unit hums for days, but does not turn off, since the shutdown point is simply not reached.
Leaks often occur in places where tubes are soldered, in the foamed part of the housing (evaporator) or through the condenser if it is damaged by corrosion. An indirect sign of a leak can be a hot condenser (grid at the back) only half hot or no heating at all, as well as swelling of the rear wall inside the refrigerator compartment. If you notice that Atlant it is working non-stop, but there is not enough cold, this is almost guaranteed to be a leak.
It is difficult to find the leak on your own, since freon is odorless and colorless. Craftsmen use leak detectors or the nitrogen pressure test method. Trying to simply add freon without finding and fixing the hole is a temporary solution that will lead to complete failure of the compressor in a short time.
Wear of the compressor and problems with the start relay
The compressor is the “heart” of the refrigerator Atlant. Over time, its mechanical part wears out, the piston group loses compression, and the motor ceases to create the necessary pressure in the system. In an attempt to compensate for low efficiency, he works non-stop. You can determine the loss of performance by the sound: the motor may hum quieter than usual or, conversely, make metallic clanging sounds.
Another critical element is the start-up relay. If its contacts are burnt or the mechanism is stuck, it may not open the starting circuit, leaving the compressor on constantly. In some cases, the relay, on the contrary, often clicks, trying to start the motor, but if it is “stuck” in the “on” position, the motor will work until the winding burns out.
Checking the compressor requires measuring the pressure in the circuit and the current strength of the windings. If the current consumption is significantly higher than the nominal one indicated on the tag, this indicates an interturn short circuit or mechanical jamming. In such a situation replacing the compressor is the only way out.
The influence of the “Super Freeze” mode and settings
Sometimes the reason is trivial and lies in the actions of the user himself. Refrigerators Atlant have a “Super Freeze” function (often indicated by a snowflake or a button with the number 7). When this mode is activated, the thermostat is blocked and the compressor operates continuous to quickly freeze a large volume of food. If you accidentally turn on this mode, the refrigerator will not turn off until you turn it off manually or the timer passes (usually 24 hours).
It is also worth checking the position of the temperature regulator. If the mechanical thermostat knob is turned to maximum and the room is hot, the refrigerator may simply not cope with the heat influx and work without stopping. In electronic models, settings failure can occur due to a power surge.
Problems with door seals and thermal insulation
Violation of the seal of the chamber is a common reason for the constant operation of the motor. If the rubber seal on the door is worn out, dirty or deformed, warm air from the room constantly enters the chamber. Sensors detect an increase in temperature and give a command to cool down. The refrigerator Atlant tries to compensate for the heat gain, working in enhanced mode.
You can check the tightness of the door with a simple test with a sheet of paper. Clamp the sheet between the door and the body in different places around the perimeter. If the sheet pulls out too easily or falls off on its own, the seal is broken. Also, the cause may be door distortions due to improper installation or weakening of the hinges.
In older models, the thermal insulation layer (foam) in the walls of the case may be destroyed. This leads to the formation of condensation outside (“crying” sides) and constant operation of the compressor, as the cold quickly escapes outside. It is almost impossible to restore factory foam efficiently at home.
Diagnostics and table of symptoms
To accurately determine the cause, it is necessary to compare the symptoms. Below is a table that helps classify the malfunction according to the external signs of the operation of your Atlanta.
| Symptom | Probable cause | Nature of engine operation | Necessary actions |
|---|---|---|---|
| The engine is humming, there is no cold | Freon leak | Works non-stop, hot | Call a technician to find a leak |
| There is a “coat” of ice in the chamber | Thermostat/sensor is faulty | Does not turn off, severe freezing | Replacing the thermostat |
| Intermittent humming, clicking | Problems with the starting relay | Attempts to start or constant operation | Replacing the relay |
| Noisy hum, vibration | Wear of the compressor | Works constantly, gets hot | Replacing the compressor |
⚠️ Attention: If you smell burns or you see sparking in the compressor area, immediately unplug the cord from the outlet. Further operation is a fire hazard.
☑️ Do-it-yourself initial diagnostics
When you need to call a technician
There are a number of situations when DIY repairs are impossible or dangerous. If the diagnosis shows a freon leak, special equipment is required: a vacuum pump, a pressure gauge station and a scale for refilling. It will not be possible to carry out this work efficiently on your own.
Also, you should not climb inside the foamed circuit to look for a leak in the evaporator. This requires opening the case, which violates the factory sealing and aesthetics. In such cases, it is often cheaper and more reliable to replace the evaporator with a mounted one or contact a service center.
If the problem is in the electronic control module, professional re-soldering of the elements or replacement of the board with subsequent re-flashing is necessary. Attempts to “repair” a board with a soldering iron without a circuit often lead to complete burnout of the electronics.
Can the Atlant refrigerator not turn off due to the heat in the room?
Yes, if the room temperature exceeds +30...+32°C, the refrigerator can work almost non-stop, trying to maintain the cold. This is not a breakdown, but a feature of thermodynamics. However, normally there should still be short pauses.
How long should the compressor operate normally?
Under normal conditions, the operating cycle is approximately 15-20 minutes of work and 20-30 minutes of rest. The operating time coefficient is usually 0.3–0.5 (that is, 30-50% of the time it works, the rest is idle).
Is it dangerous if the refrigerator worked without stopping all night?
Short-term operation without stopping (for example, after complete defrosting or loading warm products) is acceptable. But if this lasts more than 6-8 hours, this is an emergency mode, leading to overheating of the motor windings.
Why does Atlant not turn off after defrosting?
Immediately after defrosting, the unit works for a long time to gain temperature. But he must turn off. If it hums for more than 2-3 hours after defrosting and does not turn off, the seal is probably broken or the thermostat is broken.