The situation when the refrigerator does not turn offis one of the most alarming for the owner of household appliances. You may notice that the motor hums for hours, the inside of the chamber becomes too cold, and an ice crust forms on the walls. This is not just an annoying noise, it is a signal that the thermoregulation system has failed and the unit is wearing out. If you don’t understand in time why the device stops stopping, you may face an expensive replacement of the compressor.
The first thing that comes to mind is that the temperature sensor is broken. However, there can be many reasons: from a banal loss of door tightness to a complex refrigerant leak in a sealed circuit. Modern models with electronic control they often issue error codes, but the good old “Atlantas” or “Indesites” silently continue to freeze until they burn out. It is important to learn to distinguish between symptoms in order to understand whether you can solve the problem yourself or whether you need to call a specialist.
In this article we will analyze in detail mechanical and electrical faults that lead to an endless cycle of operation. We will look at how to check the thermostat, why the no-frost ventilation may be clogged and what to do if the compressor simply cannot “catch up” to the desired temperature due to wear. It is critically important to know: a compressor running non-stop overheats and can fail in 2-3 days of a continuous cycle.
Mechanical damage and leakage refrigerant
One of the most common reasons why the refrigerator does not turn offis a violation of the tightness of the system. The refrigerant (freon) circulates through the tubes, taking heat from the chambers and releasing it outside through the condenser. If a microcrack appears in the circuit, the gas gradually evaporates. As a result, the pressure in the system becomes insufficient for effective cooling, and the temperature sensor simply does not register the achievement of the specified minimum.
The compressor begins to work in increased mode, trying to compensate for the lack of cooling capacity. It hums continuously, but inside the chamber the temperature can even rise or remain on the verge of freezing. This is often accompanied by swelling of the side walls or the appearance of rust in places where the tubes are damaged. Old models are especially susceptible to corrosion, which causes depressurization.
⚠️ Attention: If you hear hissing or see oily spots under the refrigerator, immediately turn off the appliance from the network. Further operation with a freon leak can lead to complete combustion of the motor-compressor due to the lack of lubricant that circulates along with the gas.
Elimination of such a malfunction requires the qualifications of a technician. It is necessary to find the leak, solder it, evacuate the system and refill the freon. It is impossible to do this on your own without special equipment and soldering skills.
Malfunction of the thermostat or temperature sensor
The thermostat is the “brain” that commands the compressor to turn on or off depending on the temperature inside the chamber. In mechanical models, this is a simple tube with a bellows filled with gas. When it gets warm, the gas expands and opens the contacts. If this element fails, the circuit can remain closed forever, forcing the motor to work without interruption.
In refrigerators with a system No Frost and electronic control, the role of a thermostat is performed by sensors (thermistors). They transmit readings to the control module. If the sensor “lies” and shows that the chamber is warm, although in fact it is already frosty there, the control board will keep the compressor on. Often such sensors fail due to voltage fluctuations or natural aging.
Diagnostics of the thermostat in mechanical models is simple: you can close the contacts directly. If the refrigerator starts working and starts freezing, then the problem is with the thermostat. For electronic models, you will need a multimeter to check the resistance of the sensor at different temperatures. Replacing this element is a quick and inexpensive procedure that saves equipment from overload.
Problems with the seal and chamber tightness
It would seem that what is common between a rubber gasket and endless operation of the motor? The answer is simple: if the door does not fit tightly, warm air from the room constantly flows in. Refrigerator tries to cool this incoming volume, but due to the constant infiltration of heat, the temperature never drops to the desired value. The thermostat does not give a command to stop, and the cycle continues.
You can check the tightness in a simple way. Take a sheet of paper, clamp it with the door and try to pull it out. If the paper comes out easily, it means the seal is broken. Also carefully inspect yourself seal for cracks, creases or contamination. Dirt and grease can prevent the rubber from making tight contact with the body.
- 🧹 Wipe the seal with warm water and a mild detergent to remove plaque.
- 🔥 Try warming the deformed areas with a hairdryer so that the rubber straightens and returns shape.
- 🚪 Adjust the door hinges if it is skewed and does not fit on one side.
If the rubber cuff has lost elasticity or is torn, it must be replaced. Driving on a faulty seal not only increases your electricity bills, but also leads to premature wear of the compressor, which is forced to work at its limit.
Clogged capillary tube and filter drier
There are bottlenecks in the refrigerant circulation system that are sensitive to contaminants. The capillary tube and filter drier may become clogged with breakdown products of oil or moisture that has entered the system. This creates a so-called “plug” that prevents the normal circulation of freon. The pressure at the outlet of the compressor increases, and at the inlet it drops, which disrupts the entire refrigeration cycle.
As a result, the compressor works, but does not produce cold in the required volume. Sensors detect high temperatures and prevent the unit from going into rest mode. A characteristic sign of a blockage is that the condenser (grid at the back) may be only partially hot or, conversely, remain cold, although the motor is humming.
Why can’t you ignore the blockage?
Long-term operation with a clogged system leads to overheating of the compressor. The oil in it cokes, loses its lubricating properties, and the piston group jams. Repair in this case will require replacing an expensive motor, and not just cleaning it.
Removing the blockage requires flushing the system with nitrogen, replacing the filter-drier and vacuuming. This is a complex procedure that is performed in service centers. Independent attempts to “blow out” the system often lead to the final failure of the equipment.
Wear of the compressor and problems with the start relay
The most expensive and unpleasant reason is the wear and tear of the very “heart” of the refrigerator. Over time compressor loses its performance. The piston group wears out, the valves no longer hold pressure. The motor runs, hums, but does not create the necessary pressure for the system to operate effectively. It simply cannot “catch up” to the temperature, so it does not turn off.
It is also worth paying attention to the starting relay. If it is faulty, the compressor may hum but not start, or may have difficulty starting. However, in the context of continuous operation, it is often the wear and tear of the mechanical part of the motor that is to blame. This can be determined by the characteristic sound: if the engine is running with strain or knocking heavily, its service life is coming to an end.
| Symptom | Probable cause | Difficulty of repair | Cost |
|---|---|---|---|
| Humming, no cold, condenser is cold | Freon leak / Clogged | High | Medium/High |
| Humming, freezing, but does not turn off | Thermostat is faulty | Low | Low |
| Humming, the door does not fit | Problem with the seal | Low | Low |
| Heats up a lot, knocks | Compressor wear | High | High |
If the diagnosis confirms the wear of the compressor, in most cases it makes more economic sense to think about buying new equipment, especially if the refrigerator is more than 10-12 years old. Replacing the motor is expensive, and the remaining components of the old unit can also be worn out.
Operating features and external factors
Sometimes the reason lies not in a breakdown, but in improper operation. For example, if you have just loaded a large amount of warm food into the chamber, refrigerator it will take a long time to cool this volume. This is fine. The room temperature also affects: if the kitchen is +30°C, it will be more difficult for the equipment to achieve the set parameters.
Another important aspect is the “Super Freeze” mode. If you accidentally activate this feature (usually the light is on), the refrigerator will freeze without interruption, ignoring the thermostat. Check the control panel and disable this mode if it is not needed.
☑️ Diagnostics before calling a technician
Don’t forget about the placement of equipment. If the refrigerator is placed close to a wall or furniture, air circulation around the condenser is disrupted. It overheats and cannot effectively transfer heat, which forces the system to work in increased mode. Observe the clearances specified in the manufacturer's instructions.
⚠️ Attention: Never install the refrigerator near heat sources (radiators, stoves, ovens). Elevated ambient temperatures cause the compressor to work almost non-stop, which drastically reduces its service life.
FAQ: Frequently asked questions
How long should the refrigerator work and how long should it rest?
In normal mode, the operating cycle is approximately 15-20 minutes of work and 20-30 minutes of rest. However, this depends on the load of the cameras, the room temperature and the model of equipment. If the work time exceeds the rest time by 2-3 times, this is a cause for concern.
Is it dangerous if the refrigerator does not turn off for a day?
Yes, it is dangerous. The compressor is not designed for continuous operation for more than 12-18 hours (in emergency modes). Long-term operation without stopping leads to overheating of the windings, destruction of the oil and eventual jamming of the motor. It is better to turn off the device and carry out diagnostics.
Is it possible to use the refrigerator if it does not turn off, but freezes?
For a short time, it is possible, the food will not be lost. But you can’t leave the equipment in this condition for several days. You risk receiving an astronomical electricity bill and being left without a refrigerator due to a burnt-out compressor.
Why doesn’t a new refrigerator turn off for a long time after the first turn on?
When first started after delivery or long transportation, the refrigerator needs time to cool the entire internal volume and reach operating mode. This may take from 4 to 12 hours. During this period, continuous operation is considered normal.
Does the amount of food affect the operating time?
Yes, a full chamber holds the cold better, but it also takes longer to cool. An empty refrigerator will reach temperature faster, but when you open the door, warm air will enter faster. The optimal load is about 60-70% of the volume.