The situation when Atlant refrigerator stops turning off is familiar to many owners of this equipment. The device can hum for hours, creating constant background noise and causing concern about the safety of the electrical network. In normal operation, the compressor should turn on and off cyclically, maintaining the set temperature inside the chambers.
If the motor runs without interruption, this indicates that the cooling system cannot achieve the target values or there is a failure in the control circuit. Two-compressor models and units with the No Frost system may have their own nuances in diagnostics, but the basic principles remain similar. Ignoring the problem can lead to overheating of the motor and its complete failure.
In this article we will look in detail at why compressor works in continuous mode, how to carry out initial diagnostics yourself and in which cases you will need to call a technician. Understanding the principles of operation of the thermostat and sensors will help you quickly localize the malfunction.
Natural causes and external factors
Before you panic and look for a breakdown in the “insides” of the unit, it is worth eliminating trivial external factors. Often the reason lies not in a technical malfunction, but in operating conditions. Ambient temperature plays a key role: if the refrigerator is located near the battery, in direct sunlight or in a poorly ventilated niche, heat exchange is disrupted.
In such conditions, the motor is forced to work for wear to compensate for the constant heat influx from outside. It is also worth checking the tightness of the fit sealing rubber to the body. If the door does not close tightly, warm air constantly enters, causing the sensors to require continuous cooling.
Another factor may be recent defrosting or loading a large volume of warm food. In this case, the equipment simply tries to quickly bring the temperature up to the set values. However, if the operating mode does not change after 6-8 hours, you should look for a deeper problem.
- 🌡️ High room temperature or proximity to heating devices.
- 🚪 A door that is not tightly closed or a damaged magnetic seal.
- 🍲 Loading a large amount of warm food at a time.
- 💨 No gap between the back of the refrigerator and the wall.
⚠️ Attention: If you have just defrosted the refrigerator or loaded it with room temperature food, let it work in high mode for up to 12 hours. If after this it does not go into standby mode, the problem is technical.
Check whether the mode is turned on "Super Freeze" (or Super Freeze). In some Atlant models, this mode is activated by a button on the control panel or inside the chamber and forces the compressor to work continuously, ignoring the thermostat readings. Disable this function and monitor the reaction of the equipment.
Malfunctions of the thermostat and temperature sensors
One of the most common reasons why the refrigerator does not turn offis the failure of the thermostat. This mechanical or electronic component is responsible for closing and opening the compressor power circuit depending on the temperature in the chamber. If the contacts “stick” in the closed state, the motor will hum endlessly.
In models with electronic control, temperature sensors (thermistors) are responsible for this. They are resistors that change their resistance as heat changes. If the sensor “lies” and sends a signal to the control module that the chamber is too warm, the controller will keep the compressor on. Diagnostics of such elements requires a multimeter and knowledge of the nominal resistance values.
How to check a mechanical thermostat
To check a mechanical thermostat, it must be dismantled. Immerse the thermostat sensing tube in cold water and ice. If the contacts do not open after a few minutes, the device is faulty and requires replacement.
Replacing a thermostat is a procedure accessible to a home handyman, but requires care. It is important to install it correctly capillary tube into the seat so that it is in tight contact with the evaporator or chamber wall. Incorrect installation will lead to incorrect readings even of a new device.
☑️ Diagnostics of the control system
Problems with the control module and electronics
In modern Atlant refrigerators, especially series with a display, the whole process manages electronic control module. If the relay on the control board is “stuck” or the triac that controls the compressor fails, voltage will be supplied to the motor constantly. This is a serious malfunction that requires professional repair of the board.
Sometimes the problem lies in power surges in the network, which could damage the controls. Visually, traces of burning, swollen capacitors, or blackening in the area of the power switches may be visible on the board. Self-repair of the module is only possible if you have the skills to work with a soldering iron and a circuit diagram.
It is worth noting that in some cases it is not the board itself that can “glitch”, but the wiring. Oxidized contacts, frayed wires or poor grounding can cause chaotic behavior of equipment, including continuous operation of the compressor. Checking the integrity of the electrical circuit is the first step before replacing an expensive module.
Freon leak and blockage of the capillary system
If compressor works without stopping, but there is no cold in the chambers or there is not enough of it, there is a high probability of a refrigerant leak (freon) or a blockage in the system. When there is a leak, the pressure in the circuit drops, and the sensors (or thermostat) detect insufficient cooling, instructing the motor to run longer. However, due to a lack of gas, the operating efficiency drops to zero.
A clogged capillary tube through which freon enters the evaporator gives a similar effect. The motor hums, trying to push the refrigerant, but the circulation is disrupted. In such cases, you can often notice that the condenser (grid at the back) remains only partially cold or warm, and not hot, as it should be during normal operation.
⚠️ Attention: Self-refilling with freon or attempting to clean the system without a vacuum pump and pressure gauge station is prohibited. This requires specialized equipment and qualifications.
You can diagnose a leak visually if it occurs in an accessible place (for example, oil stains sometimes appear in the foamed part of the body), or using a leak detector. The technician will also check the current consumption of the compressor: when operating “idle” due to a leak, the current may be lower than the rated one.
Wear of the compressor and problems with the starting relay
Itself compressor is the heart of the refrigerator, and its wear can also lead to anomalies in operation. If the piston group is worn out, the motor cannot generate the required pressure and the cooling cycle does not complete. As a result, the equipment works continuously, trying to compensate for low performance.
Often the culprit is starting relay. This small element is responsible for starting the engine. If its contacts are burnt or the mechanism is stuck, the compressor may not start (hum and click) or, conversely, may not turn off. Replacing the relay is one of the simplest and cheapest repair procedures.
Pay attention to the temperature of the motor housing. If it is hot to such an extent that it is impossible to touch it, and at the same time it does not turn off, this may indicate an interturn short circuit of the windings. In this case, the compressor needs to be replaced, since further operation is a fire hazard.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Humming, no cold | Freon leak or blockage | Call a technician to find a leak |
| Buzzing, freezing slightly | Thermostat/sensor faulty | Replacing the thermostat |
| Buzzing, clicking, won't start | Start relay or compressor | Replacing the relay or diagnosing the motor |
| Works constantly, gets very cold | Sticking thermostat contacts | Urgent replacement thermostat |
Diagnostics by models and error codes
Refrigerators Atlant of different series may report problems differently. Older manual models are silent and just work. New models with electronics display error codes on the display or flash indicators. For example, a flashing temperature indicator may indicate a sensor malfunction or a problem with the board.
For two-compressor models, it is important to determine which motor does not turn off. If both work non-stop, the problem is most likely a common one (poor sealing, high room temperature). If there is only one, the fault is localized in the circuit of a specific chamber (thermostat, leak in the circuit).
In models with a system No Frost continuous operation of the compressor may be caused by a malfunction of the defrost timer or heating element. If the evaporator is covered with ice due to defrosting not working, the cold stops flowing into the chamber, and the motor tries to compensate for this by constant operation. In this case, defrosting and checking the defrost system are required.
⚠️ Attention: Technical characteristics and location of sensors may vary depending on the specific modification of the refrigerator. Always check the technical documentation (service manual) for your model before starting disassembly.
Frequently asked questions (FAQ)
How long does the Atlant refrigerator take to gain temperature after turning on?
Usually, primary cooling takes from 2 to 6 hours, depending on the volume of the chambers and the ambient temperature. If after 8-10 hours of operation without a break, the compressor does not turn off, and the temperature has not reached the required values, this is a sign of a malfunction.
Is it possible to operate the refrigerator if it does not turn off?
For a short time - yes, so that the food does not disappear. But long-term operation without stopping will lead to overheating of the compressor, oil degradation and eventual jamming of the motor. This significantly reduces the service life of the equipment.
Why does the refrigerator still not turn off after replacing the thermostat?
Perhaps the thermostat was installed with the wrong temperature range, the capillary tube was installed incorrectly (poor contact with the evaporator) or the problem was not in the thermostat, but in a freon leak.
What to do if the compressor is hot and does not turn off?
Immediately unplug the refrigerator to prevent fire or permanent motor failure. Let it cool for a few hours, then try turning it on. If the situation repeats, call a specialist.