The situation when the refrigerator stops turning off causes fair concern for any owner. The continuous hum of the motor, ice build-up on the walls and electricity bills are just the first symptoms that the user encounters. Compressorworking without interruptions experiences a colossal load, which in the shortest possible time can lead to its complete failure. Ignoring the problem can lead not only to costly repairs, but also to damage to products.
It is important to understand that continuous operation of the unit does not always mean breakdown. Sometimes the cause is simple carelessness or improper operation. However, if you notice that refrigerator compartment it is frozen, and the engine is humming for days, you need to immediately carry out diagnostics. In this article, we will analyze the main technical and operational reasons why the refrigerator does not turn off, and determine what can be fixed on your own, and where the intervention of a specialist will be required.
The first step should always be to check the most obvious things. Often, users look for a complex breakdown, losing sight of simple environmental factors. If the room temperature exceeds 30-35 degrees, the old refrigerator may not cope with the heat flow and work non-stop. This is not a malfunction, but a physical limitation of the equipment resource set by the manufacturer.
Violation of tightness and operating rules
The most common reason for continuous operation is a violation of the tightness of the circuit. If the door does not close tightly, warm air constantly enters. Sensors detect the temperature increase and command the compressor to work without stopping. Check to see if any food is interfering with the sash's tight fit. It is also worth inspecting sealing rubber around the perimeter of the door: it should be clean, elastic and without cracks.
Often the problem lies in the skew of the doors or weakening of the hinges. Over time, heavy shelves or rough handling can cause the structure to shift. In this case, even a working seal will not be able to keep the cold out. To check, you can use a simple sheet of paper: clamp it between the door and the body around the entire perimeter. If the sheet is removed too easily or, conversely, with force in different places, it means the door is warped.
⚠️ Attention: If you find that the seal is contaminated with grease or crumbs, do not use aggressive solvents. Wipe the rubber with a soft cloth soaked in soapy water so as not to damage the structure of the material.
Another factor is the frequent opening of the door, especially in hot weather. Every time you open your refrigerator, moist, warm air enters. The compressor is forced to work longer to compensate for the heat gain and freeze out excess moisture. In the summer, it is recommended to minimize the time the door is opened.
☑️ Checking the tightness of the refrigerator
Malfunction of the thermostat or temperature sensor
In mechanical models of refrigerators, thermostatis responsible for temperature control. This device opens the electrical circuit when the chamber reaches a predetermined temperature. If the thermostat fails, the circuit does not open and the motor continues to run indefinitely. A breakdown can be determined by the absence of a click when the desired temperature is reached or by the fact that the refrigerator does not turn on at all when the regulator is turned.
In modern models with a system No Frost and electronic control, the thermostat function is performed by air temperature sensors. There may be several of them: in the refrigerator compartment, in the freezer, and even in the evaporator area. If one of the sensors “lies” and shows that it is warm inside, the controller will keep the compressor on. Replacing such elements requires disassembling the case and using a multimeter to check the resistance.
Sometimes the problem is solved by simple adjustment. If you accidentally set the Super Freeze or Maximum Cooling mode, the refrigerator will work until you return the settings to standard mode. The electronics simply execute your command, ignoring standard rest cycles.
How to check a thermostat with a multimeter?
To check a mechanical thermostat, you need to remove it, wait for room temperature and ring the contacts. If, when cooled (for example, by putting it in the freezer), the resistance does not change or does not appear/disappear, the element is faulty. However, an accurate diagnosis can only be made by a specialist with reference equipment.
Refrigerant leak and problems with the compressor
One of the most serious reasons why the refrigerator does not turn off is a leak freon. When the amount of refrigerant in the system drops, the pressure decreases and the compressor cannot reach the desired condensing temperature. He works constantly, trying to “catch up” with the cold, but to no avail. In this case, the freezer may stop freezing, and the “fur coat” on the back wall of the refrigerator compartment will disappear or, conversely, ice will appear only in the corner.
Clogged capillary pipeline gives similar symptoms. A plug of oil or decomposition products forms in the refrigerant circulation system, which disrupts the normal movement of freon. The compressor overheats and wears out, but no cooling occurs. In such cases, you can often hear the engine humming louder than usual or periodically trying to start with a characteristic click.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The engine is hot, there is no cold | Freon leak | Call a technician to find the leak and refill |
| Humming and clicking, difficulty starting | Clogged or broken compressor | Diagnostics of the system and replacement of parts |
| Ice only at the back wall | Partial leak or blockage | Repair of the sealed circuit |
| The refrigerator turns off, but rarely | Wear of the seal or thermostat | Replacing consumables |
It is impossible to eliminate a leak or blockage on your own, since this requires evacuation of the system and special equipment. Attempts to simply add freon without eliminating the cause will lead to repeated breakdown in a short time.
Problems with the defrost system (No Frost)
In refrigerators with a system No Frost continuous operation of the compressor is often associated with a malfunction of the evaporator defrost system. If the defrost heating element, timer or defrost sensor fails, a coat of ice builds up on the evaporator. The air stops circulating, the temperature sensor in the chamber does not sense the cold and keeps the motor on.
Visually this can manifest itself in the fact that it is warm in the refrigerator compartment, but very cold in the freezer, or the cold disappears completely. Sometimes you can hear the sound of ice breaking inside the case. Unlike a drip system, the ice here is not immediately visible since the evaporator is hidden behind a plastic panel.
⚠️ Warning: If you suspect icing on the evaporator, do not try to break the ice with a knife or sharp objects through the vents. This is guaranteed to lead to damage to the circuit and leakage of freon.
For diagnostics, you need to defrost the refrigerator completely (at least 24 hours) and check whether cold appears after turning it on. If after defrosting the unit worked normally, but after 1-2 weeks the problem recurred, one of the elements of the defrosting system is faulty. Most often, the heating element burns out or the sensor gets stuck.
The influence of external factors and overload
Do not discount external factors. Installing the refrigerator next to heaters (batteries, stoves, ovens) or in direct sunlight makes it work in extreme conditions. Heat transfer it is disrupted, and the unit does not physically have time to cool down in order to turn off.
Proper loading of cameras is also important. If you put a large amount of warm food into the refrigerator that was just turned on, it will work until it cools the entire volume. This is a normal regime, but it should not last for days. If the chambers are filled to capacity with products, air circulation is disrupted, which also leads to continuous operation.
It is important to ensure proper ventilation of the rear wall. The gap between the refrigerator body and the wall should be at least 5-7 cm. If the refrigerator is built into a niche, the presence of ventilation holes in the furniture is a prerequisite for normal operation.
Diagnostics and when to call a technician
If you have checked the tightness, defrosted the unit and made sure that the installation was correct, but the problem persists, professional repairs are most likely required. Replacing a compressor yourself or searching for micro-leaks of freon requires special tools and knowledge. Errors during repairs can lead to the final breakdown of an expensive unit.
The technician will conduct diagnostics using a pressure gauge station, check the compressor current consumption and the tightness of the circuit. Based on this data, a decision will be made to replace the node or restore the system. In some cases, it is cheaper and safer to replace the entire compressor than to try to repair the old one.
Is it possible to operate a refrigerator if it does not turn off?
Short-term - yes, but this is emergency mode. Long-term operation without stopping will lead to overheating of the compressor windings, oil burnout and jamming of the piston group. As a result, repairs will cost much more.
Why does a new refrigerator work constantly?
New models can take longer to reach the temperature when first turned on (up to 24 hours). Also check if the Quick Freeze mode is turned on. If after 24 hours the cold has not appeared and the motor does not stop, this is a warranty case.
How often should the refrigerator turn off normally?
In normal mode, the operating cycle is approximately 10-20 minutes of work and 20-40 minutes of rest. The ratio may vary depending on the load and room temperature, but pauses in operation are required.
Does a voltage surge affect continuous operation?
Yes, voltage surges could damage the control board or the compressor starting relay. If after a thunderstorm or a surge in light the refrigerator begins to behave strangely, first of all they check the electronics.