The situation when the refrigerator does not turn off, but continues to freeze properly, often causes confusion among owners of household appliances. It would seem that if the food does not spoil and the ice in the freezer is solid, then the equipment is working properly. However, continuous operation of the compressor indicates a serious failure in the control system or heat exchange, which will sooner or later lead to breakdown of expensive components.
A constant load on the motor-compressor without proper rest cycles causes overheating of the windings and thinning of the oil. If you ignore this alarm signal, the engine resource will be exhausted in a matter of weeks, and replacing the unit will cost a significant amount. It is important to understand that even if the cold remains, the system operates in emergency mode, trying to compensate for the loss of efficiency.
In this article we will analyze in detail the main reasons why The refrigerator works without stoppingand determine what steps need to be taken immediately. We will consider both simple operating errors that you can fix yourself, as well as complex technical malfunctions that require the intervention of a specialist.
Violation of the temperature regime and operating rules
Before looking for a breakdown inside the case, it is worth analyzing external factors. Often the reason lies in a banal violation of operating rules. For example, if you have just loaded a large amount of warm food into the chamber after a holiday, the equipment goes into intensive coolingmode. In this case, it will work until it cools the entire volume to the set temperature.
Another common scenario is installing the refrigerator too close to the heat source. A radiator, stove or direct sunlight heats the case, causing the sensors to constantly record high temperatures inside. The compressor turns on and simply does not have time to turn off, since heat inflows exceed the capacity of the cooling system.
⚠️ Attention: If the refrigerator is installed close to a wall or furniture, the air circulation around the condenser (grids at the back) is disrupted. This critically reduces the efficiency of heat transfer.
Check the tightness of the door. If sealing rubber band is worn out, dirty or deformed, warm air from the room constantly enters the chamber. The temperature sensor registers the increase in degrees and gives a command for continuous operation of the motor. In such cases, you can often hear a characteristic hissing or notice frost on the end of the door.
Faults in the thermostat and temperature sensors
One of the most common technical reasons for continuous operation is failure thermostat (thermostat). This unit is responsible for opening the electrical circuit of the compressor when the set temperature is reached. If the contacts inside the thermostat “stick” in the closed position, the shutdown signal is simply not sent to the motor.
In modern models with a system No Frost and electronic control, instead of a mechanical thermostat, air temperature sensors are used. If such a sensor “lies” and shows that the chamber is warmer than it actually is, the “brains” of the refrigerator will keep the compressor on. This is often accompanied by an error on the display or blinking indicators.
Replacing the thermostat is a procedure accessible to experienced craftsmen, but requires precision. It is necessary to select an analogue with identical parameters, otherwise the temperature regime will be disrupted. In electronic models, diagnostics of the control board is required, since the problem may lie not in the sensor itself, but in its power supply circuit.
Refrigerant leak and problems with the capillary system
The situation when the refrigerator does not turn offbut freezes weakly or only in a certain place (for example, near the evaporator) often indicates a freon leak. The refrigerant circulates in a closed circuit, and if its quantity decreases, the efficiency of heat transfer decreases. The compressor works hard, trying to gain temperature, but physically cannot do this due to a lack of working fluid.
Leakage can occur in places where tubes are soldered, in the foamed part of the housing, or through microcracks in the evaporator. Often, owners notice swelling of the wall inside the chamber or the appearance of rust on the outer heating circuit of the door perimeter. In such cases, simply filling with gas will not help - you first need to find and eliminate the leak.
Another problem in this category is Clogged capillary tube. Oil breakdown products or moisture entering the system form an ice or dirt plug. The circulation of freon is disrupted, the pressure in the system drops, and the refrigerator hums without interruption, but does not produce cold. This is a complex malfunction that requires purging the system and replacing the filter-drier.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Freezing only at the rear wall | Freon leak | Searching for leaks, vacuuming, refilling |
| Humming, but no cold at all | Clogged capillary | Purge the system, replacement filter |
| The motor gets very hot | Lack of freon / Overload | Diagnostics of pressure in the system |
| The refrigerator turns off itself | Thermal relay is activated | Overheat protection, needs repair |
Wear of the compressor and start relay
The compressor motor is the heart of the refrigerator. Over time, its mechanical part wears out and the piston group loses compression. The engine continues to hum and consume electricity, but does not create the necessary pressure to circulate freon. In this state, it can work for days, since it cannot reach the target temperature.
Often the culprit of continuous operation is start relay. This small element is responsible for starting the engine. If its contacts are burnt or the mechanism is stuck, the compressor may not start fully or, conversely, may not turn off on time. In some cases, the relay simply “keeps” the circuit closed, ignoring the thermostat signals.
⚠️ Attention: If you smell something burning or see the relay sparking, immediately unplug the refrigerator. Operation with a faulty starting device can lead to burnout of the motor windings.
It is difficult to diagnose compressor wear without special equipment (tester, pressure gauges). However, if a metallic knock is heard during operation, and the unit itself becomes red-hot in a short time, most likely its resource has been exhausted. Replacing a compressor is a labor-intensive process that requires welding copper tubes.
How to check the start relay yourself?
Carefully remove the relay from the compressor contacts (after turning off the refrigerator!). Shake it near your ear. If you hear a ringing or knocking sound from internal parts, the relay is faulty and requires replacement. If there is silence inside, it may be intact, but only a test with a tester will give the exact answer.
Problems with the No Frost system and defrosting
In refrigerators with a system No Frost continuous operation is often associated with a malfunction of the defrosting system. If the heating element, timer or defrost sensor fails, the evaporator becomes coated with ice. This ice crust blocks the flow of cold air, and the sensor in the chamber constantly requires cooling.
The compressor runs non-stop, trying to blow air through the ice blockage. In this case, it may be warm in the main chamber, but extremely cold in the freezer, or vice versa. A characteristic sign is the whistling or humming of a fan, which is trying to force air through a channel clogged with ice.
To eliminate this problem, you need to completely defrost the refrigerator (at least 24 hours with the doors open) and then diagnose the elements of the defrost system. Often you have to change several components at once: heating element, sensor and timer, as they fail as a set.
☑️ Diagnostics of the No Frost system
The influence of external temperature and installation location
Do not forget that the climatic The class of the refrigerator determines the conditions in which it can operate. If you install the refrigerator on an unheated balcony in winter or in the kitchen, where in summer the temperature rises above +32°C (for class SN-N), the appliance will work under overload. In a hot room, heat exchange is difficult, and the compressor simply cannot cool down and turn off.
It is also important to consider that some models are not designed to operate at low ambient temperatures. The oil in the compressor thickens and starting becomes difficult, which can also lead to failures in the operating cycle.
If the refrigerator is in a niche, make sure that the ventilation gaps comply with the instructions. Usually, at least 5-10 cm of space from the walls and 10-15 cm from above are required. Violation of these standards turns a niche into a “thermal bag.”
When you need to call a technician: final summary
Only problems associated with improper operation can be eliminated on your own: rehang the door, replace the seal, defrost the unit or move it away from the battery. If after these actions the situation has not changed, and the refrigerator does not turn offthe reason lies in a technical malfunction.
Freon leaks, blockages of the capillary system, electronic failures and compressor wear require professional repairs using special tools. Attempts to solve these problems yourself can lead to the final failure of the equipment.
⚠️ Attention: Specifications and control interfaces may vary depending on the model and year of manufacture. Before disassembling the components, check the official instructions of the manufacturer of your model.
Frequently asked questions (FAQ)
How long can the refrigerator operate without shutting down normally?
In normal mode, the refrigerator operates cyclically: approximately 15-20 minutes on and 20-40 minutes resting. In fast freezing mode (Super Freeze), it can work for several hours in a row, but no more than 12-24 hours. If operation without stopping lasts longer than a day, this is a malfunction.
Why does the refrigerator hum loudly and does not turn off?
A loud hum combined with continuous operation often indicates that the compressor is overloaded. This may be caused by a freon leak (the compressor has nothing to pump), a clogged system, or wear on the bearings of the motor itself. Also, the source of noise can be the fan in the No Frost system if its blades touch the ice.
Is it possible to use the refrigerator if it does not turn off?
For a short time - it is possible to save food. But long-term operation in this mode is dangerous. The compressor overheats, the oil loses its properties, which leads to engine wedge. If you cannot eliminate the cause (for example, by defrosting) within 24 hours, it is better to turn off the device until the technician arrives.
Does the number of products affect the operating time?
Yes, it does. A fully loaded refrigerator takes longer to reach operating mode after loading, but then it holds the cold better and the compressor turns on less often. An empty refrigerator heats up faster when the door is opened, but it also cools down faster. However, neither a full nor an empty chamber should cause continuous operation without interruption.