The situation when the refrigerator does not turn off and continues to hum around the clock causes reasonable concern for any owner of household appliances. Constant operation of the compressor not only leads to a significant increase in energy bills, but also creates the risk of food spoilage due to a possible violation of the temperature regime. In addition, continuous load on the motor-compressor can lead to its premature failure, which will require expensive repairs.
Before panicking or calling a technician, it is necessary to carry out an initial diagnosis, since refrigerator it can work without interruption due to banal errors in operation, or due to a serious technical malfunction. Often the problem lies in a violation of the tightness of the circuit, a refrigerant leak, or a breakdown of temperature sensors that simply “do not see” that the desired temperature has already been reached. Understanding the principles of operation refrigeration unit will help you quickly localize the problem.
In this article we will analyze in detail all the possible reasons why refrigerator stopped turning off, and we will propose an algorithm of actions for every situation. It is important to distinguish between normal operation in hot weather and an emergency situation requiring specialist intervention. If you notice that motor-compressor buzzing non-stop, do not rush to conclusions - analyze the latest events.
Tightness failure and freon leakage
One of the most common reasons why refrigerator works without stopping is a decrease in the level of refrigerant (freon) in the system. If a microcrack has formed in the circuit or the pipeline is damaged, freon gradually evaporates. As a result, the compressor tries to compensate for the lack of cooling capacity, working to wear out, but still cannot reach the set temperature.
It is almost impossible to determine a leak visually, since freon is a colorless and odorless gas. However, there are indirect signs indicating depressurization of the system. For example, if refrigerator it stopped freezing in one of the chambers or a “snow coat” appeared on the evaporator only in one corner, this is an alarming signal. Also pay attention to the condition of the tubes at the back of the unit.
- 🔍 The compressor works constantly, but the temperature inside the chambers does not drop to the required values.
- 🔍 On the back wall of the refrigerator, traces of oil or characteristic streaks are visible at the joints of the tubes.
- 🔍 Motor-compressor gets very hot, and when you touch the condenser (grid at the back), it remains only partially cold or warm.
⚠️ Attention: If you suspect a freon leak, under no circumstances try to open the system yourself or add refrigerant. This requires special equipment and skills. Continuing to operate a refrigerator with a leak can lead to the compressor burning out due to lack of lubrication and cooling.
To fix this problem, you need to call a technician who will pressure test the system with nitrogen, find the leak, seal it and fill refrigerator with the required amount of freon. It is impossible to solve this problem on your own without a vacuum pump and a pressure gauge station.
Malfunction of the thermostat or temperature sensor
In modern and old models of refrigerators, different devices are responsible for temperature control: in old models it is mechanical thermostat, and in modern ones No Frost and electronically controlled systems - air sensors. If the thermostat fails, it stops sending a signal to turn off the compressor, even when the ideal cold has already been reached in the chamber.
In the case of a mechanical thermostat, the problem may be oxidation of the contacts or a leak in the bellows (sensitive element). The capillary tube of the thermostat may lose sensitivity, and refrigerator will “think” that it is warm inside. Electronic sensors often suffer from failures in the control board or broken wiring.
Diagnostics of the thermostat at home is possible, but requires caution. If you have a multimeter, you can “ring” the thermostat contacts at different temperatures. However, most often the malfunction of this unit is detected by eliminating other causes.
- ❄️ The products in the refrigerator compartment clearly freeze, turning into ice, but the motor does not stop.
- ❄️ When you turn the temperature control knob, the shutdown click does not occur, and operation compressor continues.
- ❄️ The emergency temperature indicator is on on the electronic panel, although it is cold inside.
Replacing the thermostat is a procedure accessible to a person with basic repair skills, if the refrigerator model allows easy access to the unit. In models with electronics, replacing a temperature sensor also does not take much time, but requires precise selection of an analogue.
How to check a thermostat without instruments?
Dip the capillary tube of the thermostat into a container with cold water (about 0-5 degrees). If the contacts do not open and the multimeter shows a circuit, the thermostat is faulty.
Problems with the seal and the tightness of the door
It would seem a trivial reason, but it is a loosely closed door or a worn out seal that becomes the culprit in 30% of cases of continuous operation refrigerator. If warm air from the room constantly enters the chamber, The seal is responsible for 30% of cases of continuous operation of the refrigerator. If warm air from the room constantly enters the chamber, the refrigerator is forced to work harder, trying to cool this volume.
Over time, the rubber seal loses its elasticity, becomes deformed or becomes contaminated with grease and carbon deposits, no longer fitting tightly to the body. Even a microscopic gap leads to a constant flow of heat. You can check the tightness of the seal using a simple test with a sheet of paper.
Clamp the sheet of paper with the refrigerator door around the perimeter. If the paper comes out too easily or falls out on its own, the seal is broken. Also inspect the seal for cracks, tears, or dents. Pay special attention to the corners of the door.
- 🚪 The refrigerator door opens with a slight force, without characteristic suction.
- 🚪 The gaps between the rubber and the metal body of the refrigerator are visually noticeable.
- 🚪 The seal is hard to the touch, “oaky” or has a sticky coating.
To restore the tightness, you can try washing and degreasing the seal, and also warming it with a hairdryer to restore elasticity. If the tires are severely damaged, a full one will be required. In some cases, adjusting the door hinges helps if it is skewed. replacing the seal. In some cases, adjusting the door hinges helps if it is skewed.
⚠️ Attention: Do not use aggressive solvents or abrasive sponges to clean the seal. This can speed up the deterioration of the rubber. Use warm soapy water or special rubber care products.
Improper installation and external factors
Sometimes the reason that the refrigerator does not turn off lies not in the breakdown of parts, but in the conditions of its operation. Household appliances are sensitive to the environment. If the unit is installed near heat sources or in a poorly ventilated niche, heat exchange is disrupted.
The condenser (black grille on the back or sides) must effectively transfer heat to the environment. If air circulation around it is difficult, cooling efficiency drops and compressor is forced to work longer. It is also important to take into account seasonality and room temperature.
In the summer, when the temperature in the kitchen reaches 30°C and above, it is physically more difficult for the refrigerator to cool the chambers. Under such conditions, an increase in compressor operating time is a normal situation and not a breakdown. However, if it works for days without a break, even in winter, this is a cause for concern.
Check the following conditions for installing your refrigerator:
- 🌡️ Distance to walls and furniture should be at least 5-10 cm on all sides, especially at the back.
- 🌡️ The refrigerator should not be in direct sunlight or near heating radiators.
- 🌡️ The room should not be too cold (below +10°C), since the oil in the compressor may thicken, which also will disrupt operation.
If you find that refrigerator it is close to the wall or covered with decorative panels, try to ensure air flow. Sometimes it is enough just to move the unit or remove the back panel of the furniture for the problem to solve itself.
Wear of the compressor and problems with the start relay
When they say that “the compressor has burned out,” they often mean a complete loss of performance. However, there is also an intermediate stage when motor-compressor loses its performance (compression) due to wear of the piston group. It hums, tries to pump freon, but the pressure in the system is not enough for normal operation.
In this case refrigerator works constantly, trying to gain temperature, but cannot do so. Also a common cause of continuous operation is sticking of the start relay contacts or its breakdown. The relay may not open the circuit, supplying power to the motor windings indefinitely.
It is difficult to diagnose loss of compressor compression at home. This is usually indicated by a weak flow of gas from the tubes when disconnecting the capillary (which is dangerous to do without preparation) or a characteristic “gurgling” sound during operation, which was not there before.
Symptoms of problems with the compressor and relay:
- ⚙️ A loud click is heard when starting, after which the motor hums, but not starts (or starts and does not turn off).
- ⚙️ The compressor housing heats up to temperatures dangerous to touch (more than 90°C).
- ⚙️ A smell of burning or scorched insulation appears in the area of the engine compartment.
Replacing the starter relay is an inexpensive and quick procedure that you can perform yourself by selecting an analogue according to the markings. Replacing a compressor is a complex and expensive repair that requires professional equipment for evacuation and charging the system.
Clogged capillary tube and moisture in the system
Another technical reason why refrigerator does not turn off is a clogged capillary tube. This is a thin copper tube in which the refrigerant is throttled. If there is moisture or oil breakdown products in the system, they can freeze in a narrow place of the tube, forming an ice plug.
As a result, the circulation of freon is disrupted: it does not enter the evaporator in the required quantity, the suction pressure drops, and thermostat does not record the decrease temperature. The compressor runs continuously. A characteristic sign is that the refrigerator either freezes or stops (cyclic operation with long periods).
Also, a blockage can be caused by contamination of the system with corrosion products or low-quality oil. In this case, refrigerator may work constantly, but the condenser will be barely warm, and the evaporator will only be partially cold.
| Symptom | Probable cause | Actions |
|---|---|---|
| The compressor is hot, the condenser is cold | Clogged capillary tube | Purge with nitrogen, replace the filter drier |
| Frost only at the inlet evaporator | Partial blockage or lack of freon | Diagnostics of tightness, refilling |
| Buzzing intermittently, no cold | Moisture in the system (ice plug) | Vacuuming, changing oil and freon |
Removing blockages is a task for the service center. The technician must open the system, purge it with nitrogen under high pressure, replace the filter drier and fill it again refrigerator. You won’t be able to clean the capillary yourself without equipment.
☑️ Primary diagnostic checklist
FAQ: Frequently asked questions
How long should a refrigerator operate normally?
In normal operation, the cycle is approximately: 10-15 minutes of work and 20-30 minutes of rest. The work ratio (run time/total cycle time) is typically 30-40%. If the refrigerator works for 40 minutes and rests for 10, this is already a sign of overload or heat in the room.
Can the refrigerator not turn off due to a large amount of food?
Yes, if you loaded a lot of warm products into a warm or defrosted refrigerator at once, compressor will work for a long time to cool the entire volume. Also, you should not overcrowd the refrigerator - air should circulate between the products for uniform cooling.
Is it dangerous to continue using a refrigerator that does not turn off?
Short-term operation (several hours) in hot weather or after defrosting is acceptable. But if the refrigerator hums for days, this will lead to overheating of the motor windings, jamming of the piston group and, ultimately, to expensive repairs or the purchase of new equipment.
Why does a new refrigerator work constantly in the first days?
At first When turned on refrigerator it takes time (from 4 to 12 hours) to cool the entire internal volume and enter operating mode. During this period, the compressor can work without stopping - this is normal. Do not load food in the first 2-3 hours of operation.
What should you do if the refrigerator does not turn off after defrosting?
Make sure that you completely dry the refrigerator and let it stand off for at least 30 minutes before turning it on. If the problem persists for more than a day after switching on, check that the door is tightly closed and that there is no ice in the water drainage channel.