The situation when the refrigerator does not turn off and continues to buzz around the clock is familiar to many owners of household appliances. This is not just an annoying noise that disturbs sleep, but also an alarming signal that the unit is operating in emergency mode. Constant operation of the compressor leads to rapid wear of parts, a significant increase in energy bills and, most importantly, food spoilage due to temperature violations.
Modern models, be it Bosch, LG or Indesit, are equipped with smart electronics, which should automatically stop the cooling cycle when the specified parameters are reached. If this does not happen, it means that the control system has received incorrect data or is physically unable to execute the stop command. Understanding why the refrigerator does not turn offwill help you make the right decision: call a technician or try to fix the problem yourself.
In this article we will analyze in detail all possible reasons, from banal inattention of the owners to complex technical breakdowns. You will learn how to carry out initial diagnostics, which components to pay attention to first, and when independent repairs can be dangerous for the device. It is important to act quickly, since long-term operation of the engine "for wear and tear" can lead to its complete combustion.
External factors and operating errors
Before you panic and look for the phone number of a service center, you should exclude the simplest and most obvious reasons. Often the refrigerator operates without interruption not due to breakdown, but due to violation of operating conditions. First of all, check if you accidentally turned on the “Super Freeze” mode (usually indicated by a snowflake or button Fast Freeze). In this mode, the compressor is not forcibly turned off in order to cool a large mass of food as quickly as possible.
⚠️ Attention: If you have activated the fast freezing mode, do not forget to turn it off after 24 hours. Long-term operation in this mode can lead to freezing of food and damage to the evaporator.
The second important factor is the ambient temperature. If the unit is installed next to the battery, in direct sunlight or in a niche where air circulation is impaired, the cooling system simply does not have time to release heat. As a result, sensors record the high temperature inside the chambers and command the motor to work continuously. Also check the tightness of the door seal: if the seal is dirty or damaged, warm air constantly flows inside, causing the appliances to work in increased mode.
Finally, pay attention to the volume of downloaded products. If you put a large pot of hot soup or just defrosted food at room temperature in the refrigerator, it will take a long time for the refrigerator to return to operating mode. During this period The compressor does not turn off, performing its direct function. This is normal, but loading warm products into the chamber is not recommended.
Malfunctions of the thermostat and temperature sensors
One of the most common technical reasons why the refrigerator does not turn offis the failure of the thermostat (thermostat). This small device is responsible for controlling the temperature inside the chamber. When the air cools to the set point, the thermostat should break the electrical circuit and stop the compressor. If the mechanism is stuck in the “on” position or its contacts are oxidized, the motor will work endlessly, ignoring the real temperature.
In models with a system No Frost and electronic control, instead of a mechanical thermostat, air sensors (thermistors) are used. They transmit data to the electronic control module. If the sensor is lying and shows that the chamber is warm, the module will not give a command to stop. Diagnosis of such faults requires a multimeter to check the resistance of the sensor at different temperatures.
How to check a mechanical thermostat?
To check a mechanical thermostat, you can try to gently knock on its body (located inside the chamber). Sometimes this helps to “wake up” a stuck mechanism. However, if after knocking the refrigerator turns off, this is only a temporary measure - the device still requires replacement, since its operation is unstable.
Replacing a thermostat or sensor is a procedure that can be done with your own hands if you have basic skills. However, it is important to choose an analogue with exactly the same characteristics. Installing an unsuitable sensor can result in the refrigerator either turning on and off frequently, or, conversely, not reaching the desired temperature.
Problems with the door seal and tightness
The tightness of the refrigerator compartment is the key to efficient operation. If sealing rubber band the door has lost its elasticity, is cracked, or is simply contaminated with a sticky coating, it no longer fits tightly to the body. Through the resulting cracks, warm and humid air from the room constantly penetrates into the chamber. Temperature sensors record a constant increase in degrees and do not give a command to stop the compressor.
You can check the tightness in a simple way: clamp a sheet of paper between the door and the housing around the entire perimeter. If the paper comes out easily, without resistance, it means that the seal does not fit in this place. Also visually inspect the rubber for cracks, dents or peeling. A common reason for a loose fit is door misalignment, which can occur if the refrigerator has not been serviced for a long time or has not been transported correctly.
☑️ Checking the tightness of the chamber
To restore tightness, sometimes it is enough to simply wash and degrease the seal. If the rubber has become rough, you can try treating it with silicone grease or gently heating it with a hairdryer to restore its elasticity. In case of serious damage, a complete replacement of the seal will be required, since gluing in this case will not give the desired effect.
Refrigerant leakage and clogged capillary tube
More serious reasons why the refrigerator does not turn offlie in the refrigeration circuit. If there is a freon (refrigerant) leak in the system, the pressure drops and the refrigerant no longer effectively cools the chamber. The compressor tries to compensate for the lack of cold by operating in continuous mode. Often a sign of a leak is a hot condenser (grid at the back) and a lack of cold when the motor is running.
Another common problem is a clogged capillary tube. Oil and freon circulate in the system, and over time, plugs of paraffin-like substances or oil breakdown products can form there. This prevents normal refrigerant circulation. The pressure at the compressor outlet increases, but there is no cold in the evaporator. The motor hums, trying to “push” gas, but does not turn off, since the temperature is not reached.
| Symptom | Possible cause | Nature of motor operation |
|---|---|---|
| The refrigerator is warm, the engine is hot | Freon leak | Works continuously, quiet hum |
| One chamber is freezing, the other is not | Clogging or leak | Works without stopping |
| A sound is heard gurgling | Lack of refrigerant | Operation cycles are disrupted |
| The motor vibrates strongly | Increased pressure | Works with overload |
Repairing a refrigeration circuit is a complex procedure that requires special equipment (vacuum pump, pressure gauges, burner). It is impossible to fix a leak or break through a blockage on your own without skills and tools. An attempt to independently solder the tubes without pumping out the system will lead to instant failure of the compressor.
Malfunctions of the start relay and compressor
If the compressor does not turn off, but does not gain the required power or makes strange sounds, the problem may be in the very “heart” of the refrigerator or its starting device. The starting relay is responsible for starting the engine. If its contacts are burnt or the mechanism is jammed, the compressor may hum, but not start, or work in emergency mode, heating up to critical temperatures.
The compressor itself can also cause the problem. Wear of the piston group leads to a drop in compression. The motor runs, but does not create enough pressure for proper cooling. As a result, the sensors do not record the achievement of the desired temperature, and the cycle is not interrupted. This can be determined by a characteristic sound (metallic knocking, clanging) and very strong heating of the motor housing.
⚠️ Attention: If you smell burnt wiring or see sparking in the area of the start relay, immediately unplug the refrigerator. Operation in this condition poses a risk of fire.
Replacing the start relay is a simple operation that you can perform yourself by selecting an analogue according to the markings. However, replacing the compressor requires calling a technician, since the system must be sealed, vacuumed, and charged with freon.
Failure of the electronic control module
In modern refrigerators, the entire process is controlled by an electronic "brain" - a control module. If there is a failure in its circuit, a power surge or failure of elements, it can send incorrect commands to the actuators. For example, the module may not “see” the signal from the thermostat that the temperature has been reached, and continue to supply voltage to the compressor.
Often such failures occur after a thunderstorm or power surges in the network. In some cases, a reboot helps: if you unplug the refrigerator for 15-20 minutes, the module can reset the error and return to normal mode. However, if the problem is in the hardware of the board (burnt triac, swollen capacitor), you cannot do without repairing or replacing the module.
Diagnostics of the module requires knowledge in electronics. Visually, you can only notice obvious signs: blackening, swelling, burning smell. If there are no external signs, but the refrigerator behaves inappropriately (for example, the display blinks, does not respond to buttons, does not turn off), most likely the problem is in the control board.
Frequent questions and answers (FAQ)
Why does a new refrigerator work without stopping on the first day?
This is an absolutely normal phenomenon. After the first turn on, the empty chamber takes time (from 2 to 12 hours depending on the model and volume) to cool to the set temperature. During this period The compressor runs continuously. As soon as the temperature stabilizes, it will begin to turn off.
Can the refrigerator not turn off in the summer?
Yes, in hot weather the load on the cooling system increases. If the room is +30°C, it is more difficult for the refrigerator to release heat, and operating cycles may be longer and pauses may be shorter. However, the complete absence of pauses (works for days) even in summer is a sign of a malfunction.
What will happen if you do not fix a refrigerator that does not turn off?
Long-term operation without stopping leads to overheating of the compressor, burnout of the windings and other engine breakdown. You may also need to replace the thermostat or repair the refrigeration circuit, which will cost much more than fixing the problem in a timely manner.
How can you tell that it is the thermostat that has broken and not something else?
If, when the temperature reaches a low temperature (the food is frozen), the motor continues to hum, most likely the thermostat is to blame. If there is no cold at all, but the motor is running, the problem is a freon leak, a blockage, or the compressor itself.