The situation when Atlant refrigerator stops turning off and buzzes without interruption is familiar to many owners of household appliances. The two-chamber models of this brand are famous for their reliability, but even they may experience compressor malfunctions over time. Constant operation of the motor leads to rapid wear of parts, excessive consumption of electricity and, most unpleasantly, damage to food due to a possible violation of the temperature regime.
It is quite simple to understand that the unit is operating in emergency mode: it either does not shut down at all, or the periods of rest become negligible. In normal condition compressor should turn on and off cyclically, maintaining the set temperature. If you notice that your refrigerator hums for days on end, you must immediately carry out initial diagnostics to exclude critical malfunctions of the cooling system.
In this article we will analyze in detail the main reasons why Atlant may not go into standby mode. We will consider both simple operating errors that can be corrected on your own in a couple of minutes, as well as complex technical breakdowns that require the intervention of a specialist. A critical sign of a serious breakdown is the operation of the compressor without stopping when the evaporator is completely defrosted and there is no cold in the chambers.
Checking the temperature mode and fast freezing mode
Before you panic and look for tools to disassemble the unit, you should make sure that the problem does not lie in incorrect settings. Often, users accidentally activate the "Super Freeze" function (or “Quick Freeze”), which forcibly keeps the compressor on for a long time to quickly cool a large volume of food. On the control panel Atlant this mode is usually indicated by a lit indicator with the image of a snowflake or star.
If this mode is activated, the refrigerator will work non-stop until you turn it off or until it expires timer (usually several hours). It is also worth checking the position of the temperature regulator. If the thermostat is turned to the maximum (values 6 or 7, or “Max”), the equipment will strive to achieve extremely low temperatures, which in hot weather or when the chambers are fully loaded may be physically impossible, forcing the motor to work in a continuous cycle.
Make sure that the doors are tightly closed and the seals do not allow warm air to pass through. The constant entry of heat inside causes temperature sensor signal to the controller about the need for cooling, even if the food is already frozen. Check whether food or dishes are interfering with the tight fit of the door.
Malfunctions of the thermostat and temperature sensors
One of the most common reasons why Atlant refrigerator does not turn off is the failure of the thermostat (in mechanical models) or air sensor (on electronically controlled models). A thermostat is a device that measures the temperature inside a chamber and opens the electrical circuit when a predetermined threshold is reached. If its contacts are “stuck” in a closed state, the compressor will receive current constantly.
In modern models with the system No Frost or “Full No Frost”, electronic sensors are responsible for temperature control. If such a sensor “lies” and shows that it is warm in the chamber, although in fact it is already frosty there, the electronics will keep the motor on. Diagnosis of this problem often requires testing the contacts with a multimeter.
- ❄️ Symptoms of failure: The compressor hums continuously, the temperature in the chamber is below normal (food is frozen) or, conversely, above normal when the motor is running.
- 🔧 Mechanical thermostat: Usually located inside the refrigerator compartment or under lamp shade. If there is a malfunction, it often requires a complete replacement of the unit.
- 💻 Electronic sensor: Located in the air duct or on the rear wall. The error is read by the code on the display or the blinking of the indicators.
How to check the thermostat without instruments?
Remove the thermostat, immerse its sensitive tube in cold water with ice for 2-3 minutes. If there is no click, but the contacts ring, the part is faulty.
Replacing the thermostat is a procedure accessible to a home craftsman, but requires caution. It is important to choose an analogue with identical parameters, since different modifications Atlant may require thermostats with different on and off temperatures.
Problems with the compressor start-up relay
The start relay is a small block attached on the side of the compressor, which is responsible for starting the engine and protecting against overloads. If this element is faulty, it may not break the starting winding circuit after the motor starts. As a result, the engine continues to work, hums strongly and heats up, but cannot return to normal operating mode or, conversely, works without stopping, trying to compensate for the lack of effective compression.
Often, a relay breakdown is accompanied by a characteristic click when trying to turn on, after which the engine hums for several seconds and stalls (although in your case it may not stall if the contacts are simply short-circuited). Visually, traces of soot, plastic melting or contact corrosion may be visible on the relay.
| Symptom | Probable cause | Solution |
|---|---|---|
| Buzzing and heating of the relay body | Sticking contacts | Replacing the relay |
| No shut-off click | Faulty bimetallic plate | Replacing the relay |
| The compressor is hot, but not cold | Problem with windings or relays | Motor diagnostics |
☑️ Compressor relay diagnostics
When replacing, it is important to consider that the relays are selected strictly for the compressor model. There are no universal solutions here, and installing an unsuitable part can lead to combustion of the motor-compressor itself. Freon leakage and violation of the system tightness. If motor-compressor.
Freon leak and system leakage
If Atlant refrigerator works without stopping, but there is no cold in the chambers (or very low), this is a sure sign of a refrigerant leak. The system loses freon, the pressure drops, and the compressor tries to compensate for the lack of cold by working 24/7. However, since the volume of gas is insufficient, the desired temperature is simply not achieved.
A leak can occur anywhere in the circuit: in the foamed part of the case (where the evaporators are located), in the places where the tubes are soldered, or through the condenser on the back wall. Often, a sign of a microcrack in the foamed part is the swelling of the back wall inside the freezer or the appearance of rust on the metal.
⚠️ Attention: If you suspect a freon leak, under no circumstances try to simply add gas. Without finding and eliminating the leak (soldering), refilling will only give a short-term effect, and the compressor will burn out due to wear and tear.
Diagnostics of a leak requires special equipment - a leak detector and a pressure gauge station. The technician pumps the system with nitrogen to find where the gas is coming out, eliminates the damage, and only after evacuation fills in a new volume refrigerant. It is impossible to carry out this repair yourself without tools.
Clogged capillary tube
Another technical reason for continuous operation is clogging of the capillary tube. This is a thin copper pipeline in which throttling (a sharp drop in pressure) of freon occurs before it enters the evaporator. If there is moisture or oil oxidation products in the system, an ice or dirt plug forms in the bottleneck of the tube.
If clogged, the circulation of freon is disrupted. The compressor works by creating high pressure at the inlet of the tube, but the gas does not enter the evaporator in the required volume. As a result, it is warm in the refrigeration chamber, and the compressor itself overheats from the constant load. A characteristic sign is that the condenser (grid at the back) may be hot only at the beginning or, conversely, remain cold, and the filter drier may become covered with frost.
The blockage is cleared by purging the system with nitrogen under high pressure or replacing the capillary tube. The procedure is complex and requires qualifications, as it is associated with depressurization of the circuit and subsequent evacuation.
The influence of external factors and operating errors
The reason does not always lie within the equipment. Sometimes refrigerator does not turn off due to environmental conditions. If the unit is located next to the battery, in direct sunlight or in a niche where air circulation is impaired, heat exchange is difficult. The compressor is forced to work longer to remove heat.
It is also worth considering the age of the equipment. In older models Atlant the lubricant in the compressor could dry out or the piston group could wear out. The motor loses performance and, in order to maintain the temperature, is forced to work without interruption. This is a natural aging process, which indicates the approaching end of the unit’s life.
- ☀️ Heating: Installation near heat sources causes the thermostat to “think” that the chamber is hot.
- 🧊 Icing: If you do not defrost the refrigerator for years, the ice crust will the evaporator acts as a heat insulator, interfering with cooling.
- 🔌 Voltage: Unstable voltage in the network can lead to incorrect operation of the control electronics.
⚠️ Attention: Specifications and installation requirements may vary for different series of refrigerators. Always check the official instructions for your model to find out the permissible ambient temperature range.
When you need to call a technician
Independent repair is possible only in cases of replacing the thermostat, relay or eliminating simple operating errors. If the problem lies in the sealed circuit (leakage, blockage) or in the compressor itself, professional intervention is essential. Attempts to “fix” the system by adding freon or tapping the motor often lead to final breakdown.
Call a specialist if: after defrosting for 24 hours the situation has not changed; you hear gurgling or hissing, but there is no cold; the compressor is very hot to the touch; or you see traces of oil near the pipes. Professional diagnostics will save you money on buying a new refrigerator.
How much does the repair cost?
The cost depends on the spare part. Replacing the thermostat is inexpensive, replacing the compressor or sealing a leak in the housing is expensive and often not economically feasible for older models.
Frequently asked questions (FAQ)
Why does the Atlant refrigerator hum, but does not freeze?
Most likely, there is a freon leak or there is a blockage in the capillary tube. The compressor runs idle, not creating the necessary pressure for cooling. You need to call a technician to find the leak and refill it.
Is it possible to leave a running refrigerator turned on overnight?
If it works normally (turns on and off), you can. If it hums non-stop due to a breakdown, leaving it overnight is dangerous: the compressor or wiring may burn out, which will lead to a fire.
How often should a refrigerator turn off normally?
Under normal conditions, the operating cycle is approximately 10-20 minutes of operation and 20-40 minutes of rest. The working time ratio should not exceed 50-60%. If the refrigerator works more than it rests, this is a cause for concern.
What to do if after defrosting the refrigerator still does not turn off?
Check the thermostat settings. If they are normal, let the equipment stand turned off for a couple of hours. If after turning on the problem recurs, there is likely a malfunction of the thermostat or a gas leak.