The situation when The refrigerator does not turn offis familiar to many owners of household appliances. Normally, the compressor should operate cyclically: turn on to cool the chamber and turn off when the set temperature is reached. If the motor hums without interruption, this indicates an overload of the system. This condition is dangerous not only due to a sharp increase in electricity bills, but also due to the rapid wear and tear of expensive components of the unit.
Constant operation of the motor often leads to overheating of the windings and failure of the compressor, which is one of the most expensive breakdowns. In addition, a coat of ice may form in the refrigerator compartment, and food may freeze or, conversely, spoil due to a violation of the temperature regime. It is important to understand that modern models with inverter motors they can operate in low power mode for a long time, but the complete absence of pauses in operation for old and new models is an alarming symptom.
Before calling a technician, it is worth carrying out the initial diagnostics yourself. Often the reason lies not in a technical malfunction, but in improper operation or installation of the device. In this article we will look in detail why the refrigerator does not turn offhow to find the root of the problem and what steps need to be taken to restore normal operation of the device.
The main reasons for the continuous operation of the compressor
The first thing you should pay attention to is external factors. If the unit is installed too close to a wall or heat source (battery, stove), heat exchange is disrupted. The compressor is forced to work hard, trying to compensate for the constant flow of heat. The distance to the back wall should be at least 5-7 cm to ensure normal air circulation.
The second common reason is a loose door fit. If sealing rubber band is worn out, dirty or deformed, warm air constantly enters the chamber. Sensors detect an increase in temperature and do not allow the engine to rest. Check the cleanliness of the seal and make sure that the door closes tightly around the entire perimeter.
⚠️ Attention: If you notice that the seal is cracked or has lost elasticity, replacing it is the only solution. Attempts to lubricate it with oil can only give a temporary effect.
The third reason is setting the temperature too low. During the hot season, users often turn the regulator to maximum, forgetting that the refrigerator cannot work forever. The operation is also affected by a large number of products loaded at the same time. Warm foods take a long time to cool, causing compressor to work non-stop.
Checking the temperature conditions and settings
Incorrect thermostat settings are one of the most common reasons why the refrigerator does not turn off. In mechanical models, the regulator is a rotary disk with divisions. If it is set to the maximum value (usually 6 or 7), the equipment will strive to reach extremely low temperatures, which under normal conditions is impossible without interruptions.
In electronic models the situation is similar, but control is carried out through the panel. The error could have occurred accidentally, for example, if a child touched the panel or a power surge occurred that disrupted the settings. It is necessary to check the current readings and compare them with the recommended values in the instructions. For the main camera, the optimal range is considered to be from +3 to +5 degrees Celsius.
It is important to take into account seasonality. In summer, when the room is hot, the load on the unit increases. If you have just placed a large amount of room temperature food in the chamber super freezing mode or just worked intensively for several hours, this is normal. However, if the cycle is not interrupted for more than 24 hours, the alarm should be sounded.
The influence of the quality of the seal and tightness
The tightness of the refrigeration chamber is the key to energy efficiency. If warm air enters the system, moisture from it condenses on the walls, forming ice. This creates an additional thermal load. The seal (cuff) must be checked regularly. The rubber should not have cracks, tears, or areas where it has separated from the body.
There is a simple test using a paper sheet. Press the sheet of paper around the entire perimeter of the refrigerator door. If the paper is removed easily and without resistance, it means that the seal does not fit tightly in this place. It is also worth inspecting the door hinges: if they are loose, the door may warp, breaking the seal even with a working rubber band.
Contamination on the seal also plays a role. Grease, sticky food marks or dust create gaps. Wipe the rubber with a soft cloth soaked in soapy water or a special rubber care product. After cleaning, you can lubricate the seal with silicone grease (not petroleum-based!) to restore elasticity.
Technical malfunctions: thermostat and sensors
If external factors are excluded, the problem lies internally. A thermostat (temperature regulator) is a device that controls the temperature inside the chambers and sends a signal to turn the compressor on or off. If the thermostat contacts are “stuck” in the closed position or its senses
drinking tube fails, the signal to turn off the motor is simply not received.
In models with the system No Frost electronic sensors (thermistors) monitor the temperature. They may give incorrect readings due to oxidation of contacts or internal breakage. The electronic control module, receiving an erroneous signal that the chamber is warm, continues to drive the compressor. Diagnosis of such faults requires a multimeter and knowledge of electrical circuits.
Symptoms of a thermostat malfunction are often accompanied by the fact that the refrigerator either does not turn off at all or does not turn on at all. In some cases, incorrect operation is observed: for example, it is too cold in the refrigerator compartment, and, on the contrary, warm in the freezer, or the unit operates in short cycles.
☑️ Thermostat diagnostics
Problems with the refrigerant and compressor
Leakage of freon (refrigerant) - serious technical malfunction. When the amount of gas in the system decreases, the pressure drops. The compressor tries to compensate for the lack of refrigerant by running longer to reach the desired temperature. However, due to the low pressure, cooling occurs very slowly or not at all, and the motor does not receive a command to stop.
When there is a leak, you will often notice that the condenser (grid at the back or on the sides) remains only partially cold or warm. Also a characteristic sign is swelling of the oil filter or the appearance of oily spots near the tubes. Refilling the refrigerator and leak detection are complex processes that require professional equipment.
Wear of the compressor itself can also lead to problems. If compression is lost (the piston group is worn out), the engine hums but does not create the necessary pressure. It works constantly, trying to “catch up” with the cold, but its efficiency tends to zero. In this case, replacement of the unit is required.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The motor hums, but there is no cold | Freon leakage or compressor breakdown | Call a technician for diagnostics |
| The refrigerator does not turn off, there is ice inside | The thermostat is faulty or the door does not close | Check the seal and settings |
| Extreme heating of the motor housing | Overload, wear or interturn short circuit | Urgently disconnect from the network |
| Short operating cycles | Malfunction of the starting relay | Replacing the relay |
No Frost system and defrosting problems
In refrigerators with a system No Frost continuous operation of the compressor is often associated with a malfunction of the defrost system. If the defrost heating element, timer or defrost sensor fails, the evaporator becomes overgrown with ice. The air stops circulating, the sensors cannot read the real temperature, and the motor runs without stopping.
A sign of such a problem may be that it is cold in the freezer compartment but warm in the refrigerator compartment, or the presence of a large amount of ice and snow on the back wall inside the freezer (behind the plastic panel). In this case, it is necessary to completely defrost the refrigerator (for at least 24 hours) to check.
If, after a long defrosting and turning on, the refrigerator began to work normally (with pauses), but after a few days the problem returned, it means that one of the elements of the defrosting system is faulty. Replacing the heating element or sensor yourself is possible if you have electrical skills.
⚠️ Attention: Never try to break off ice with a knife or other sharp objects. This can lead to a breakdown of the evaporator and instantaneous release of all refrigerant. Use only warm water or a hairdryer (with caution).
When you need to call a specialist
There are a number of situations when self-repair not only will not help, but will also aggravate the situation. If you have checked all the settings, made sure that the door is tight and installed correctly, but the refrigerator does not turn offmost likely, professional diagnostics are required. Especially if the device is more than 7-10 years old.
Calling a specialist is required if a freon leak is suspected. Refrigerants used in modern technology may be flammable or require special equipment for charging. In addition, the technician will be able to accurately determine whether it is worth repairing the old unit or whether it is cheaper to purchase a new one.
Help is also needed if extraneous sounds are heard: knocking, grinding, strong vibration. This may indicate mechanical destruction of the compressor components. Operation of such a refrigerator can lead to a fire in the wiring or complete failure of the electronics.
Prevention and operating rules
To avoid situations where The refrigerator works and does not turn off, it is important to follow the operating rules. Defrost your equipment regularly (if it is not No Frost), wash the drainage hole and keep the condenser at the back clean. Dust on the radiator grille drastically reduces the efficiency of heat transfer.
Do not place hot foods in the chamber. This creates an enormous load on the compressor. Also, do not load the refrigerator to capacity with food; leave space for cold air to circulate. The correct arrangement of products is the key to the long life of your unit.
Monitor the condition of the seal and hinges. Periodically check that the door is not warped. Following these simple rules will help extend the life of your equipment and avoid costly repairs. Remember that prevention is always cheaper than eliminating the consequences of an accident.
Why does the refrigerator hum, but does not cool or turn off?
Most likely, there is a freon leak or a clogged capillary pipeline. The compressor runs idle, trying to create pressure, but the refrigerant circulation is disrupted. You need to call a technician to find the leak and refill it.
Is it possible to leave the refrigerator on all the time?
The refrigerator must operate in cyclic mode. Constant operation without pauses (24/7 without stopping) indicates a malfunction. The normal operating cycle is from 20 to 40 minutes of work and about the same amount of rest, depending on the model and load.
How long can a refrigerator work without turning off after defrosting?
After complete defrosting and turning on the empty refrigerator, it can work continuously for 1-2 hours to gain temperature. If after this it does not turn off for another 3-4 hours, there is a problem with the thermostat or a leak.
Does the temperature in the room affect the operation of the refrigerator?
Yes, directly. If the room is hot (above +30°C), the refrigerator will work longer and more often. If the room is too cold (below +10°C), the refrigerator may not turn on at all, since the thermostat will not detect the need for cooling.