Why the refrigerator does not turn off: reasons and solutions

The situation when the refrigerator operates without interruption and does not go into rest mode is one of the most alarming signals for the owner of household appliances. A compressor that hums around the clock not only creates obsessive noise that disturbs the peace of the household, but also consumes a colossal amount of electricity. Moreover, constant wear and tear leads to rapid overheating of the motor, which can cause its rapid failure and the need for expensive replacement.

In normal operation, the cooling cycle alternates with pauses, during which the temperature inside the chambers stabilizes. If you notice that unit it has been working non-stop for several hours or even days, you need to urgently look for the reason. Ignoring the problem often leads to defrosting of food in one chamber and deep freezing in another, as well as melting of the wiring or burning of the motor windings.

Before calling a technician, it is worth carrying out the initial diagnostics yourself. Often the reason lies in trivial things, such as improper installation or clogged drainage, which can be easily fixed on your own. However, in some cases we are talking about serious technical malfunctions that require the intervention of professionals using specialized equipment.

Malfunctions of the thermostat and temperature sensors

One ​​of the most common reasons for continuous operation is failure of thermostat (thermostat). It is this element that is responsible for sending a signal to the compressor to turn it on or off. If the thermostat contacts stick in the “on” position or oxidize, the circuit does not open, and the motor continues to operate even when the desired temperature has already been reached inside.

In modern models with a system No Frost and electronic control, the thermostat function is performed by air temperature sensors. Their readings may be distorted due to moisture, contact oxidation, or a software failure in the control module. In this case, the refrigerator “does not see” that the cold has already accumulated and continues to freeze.

⚠️ Attention: Trying to replace the thermostat yourself without accurate diagnostics may lead to the purchase of the wrong part, since the resistance parameters for different models may differ.

To check a mechanical thermostat, it is often necessary to “freeze” it or call it with a tester, which is better to trust specialist. In electronic models, diagnostics are carried out by reading error codes, which can be displayed on the display or transmitted through blinking indicators.

Refrigerant leakage and problems with the tightness of the circuit

If there is a problem in the circulation system freon leak, the refrigerator tries to compensate for the lack of cold by constantly operating the compressor. Sensors detect that the temperature in the chamber is higher than normal and give the command to the motor to work without stopping. However, no matter how much the unit hums, it will not provide the required cold, since the volume of refrigerant is critically small.

Leaks can occur in places where pipes are soldered, in the evaporator (especially if it was damaged with a knife during defrosting) or in the condenser due to corrosion. An indirect sign of a leak is often swelling of the rear wall of the refrigerator compartment or the appearance of yellowish oily spots at the site of damage to the pipeline.

Diagnostics of a leak requires the use of a leak detector or testing the system with nitrogen pressure. Simply “refilling” the refrigerator without finding and eliminating the leak is pointless - the gas will leave again after a short time.

Wear of the rubber seals and loss of tightness

A tight fit of the doors is the key to energy efficiency. If sealing rubber (the cuff) is worn out, dirty or deformed, warm air from the room constantly penetrates into the chamber. The sensors react to the increase in temperature and force the compressor to work in increased mode, trying to cool the incoming heat.

You can check the tightness by simple visual inspection and tactile method. The rubber should be soft, elastic, without cracks or tears. If the door does not close tightly or comes off in the corners, the problem is in the seal.

Often the cause of a loose fit is not the rubber itself, but the skew of the door or weakening of the hinges. In this case, adjusting the hinges can solve the problem without replacing consumables.

Clogging of the capillary tube and filter-drier

In the refrigerant circulation system, capillary tubeplays an important role, which regulates the pressure and supply of freon to the evaporator. Over time, a blockage may form in it (a plug of oil, moisture, or refrigerant breakdown products), or the filter drier may become clogged. This disrupts the normal circulation of the refrigerant.

When clogged, the compressor works with overload, trying to push freon through the obstacle. The pressure in the system increases, the motor heats up, but the cooling capacity drops. A characteristic sign is a hot condenser (grid at the back) only at the beginning or, conversely, its cold state when the engine is running.

Removing the blockage is a complex procedure that requires evacuating the system, purging with nitrogen and replacing the filter-drier. It is almost impossible to carry out high-quality cleaning at home.

Improper operation and external factors

Before risking a breakdown, it is worth eliminating factors that depend on operating conditions. If the refrigerator is installed next to the radiator, in direct sunlight or in a niche with poor ventilation, heat exchange is disrupted. The compressor does not physically have time to cool down and turn off.

Frequent opening of doors, placing hot foods inside or loading large volumes of food also affects it. In such cases, long-term operation is the normal reaction of the system to a sharp increase in heat load.

It is important to monitor the distance to the walls. The rear grille should have a gap of at least 5-7 cm for free air circulation. If the refrigerator is close to a wall or furniture, it will operate in emergency mode.

⚠️ Attention: Installing the refrigerator in an unheated room (balcony, garage) at a temperature below +5°C or above +32°C can lead to incorrect operation of the thermostat and thickening of the oil in the compressor.

Diagnostics and table symptoms

To more accurately determine the cause of continuous operation, it is recommended to analyze a set of symptoms. Below is a table that helps to compare the symptoms with a probable malfunction.

By analyzing the behavior of equipment, you can significantly narrow the search range. However, remember that accurate diagnostics of the condition of the compressor and the pressure in the system can only be carried out by a technician with a pressure gauge station..

Prevention and care recommendations

To avoid situations where the refrigerator stops turning off, it is necessary to regularly carry out preventive measures. Timely defrosting (for drip systems), cleaning the drainage hole and washing the condenser from dust will prolong the life of the unit.

Do not overload the chambers with products beyond the norm, this disrupts air circulation. Monitor the condition of the seals and change them at the first signs of wear. Regularly checking the temperature inside the chambers using an external thermometer will help you notice deviations in time.

Frequently asked questions (FAQ)