The situation when a household refrigerator stops going into rest mode and hums around the clock is one of the most common and alarming for equipment owners. The constant operation of the motor-compressor not only leads to a sharp increase in electricity bills, but also creates excess noise that interferes with comfortable living in the apartment. Moreover, such a load critically reduces the life of the main unit, bringing closer the time of expensive overhaul or complete replacement of the device.
It is important to understand that modern models of refrigeration equipment, such as Indesit, Bosch or LG, are designed taking into account cyclical operation. They must reach the set temperature and turn off, waiting for the degrees in the chamber to naturally increase. If this cycle is disrupted, it means that the control system or the tightness of the circuit has failed. In some cases, the problem can be fixed on your own, but often the intervention of a qualified technician is required.
You should not ignore the first signs of a malfunction, hoping that the equipment will “work out” or the problem will disappear on its own. Long-term operation without interruption is always a symptom, not the norm. In this article, we will analyze in detail the main causes of failure, methods for diagnosing them and an algorithm of actions that will help you make the right decision on repairs.
How to determine that the refrigerator really does not turn off
Before sounding the alarm, you need to make sure that the equipment is really working in emergency mode. Many modern refrigerators, especially those equipped with the No Frostsystem, can work longer than the usual old-style models. This is due to the peculiarities of the defrosting and humidity maintenance algorithms.
Pay attention to the duration of the cycles. In normal mode, the refrigerator runs for about 15-20 minutes, followed by a pause of the same duration or longer. If you hear the hum of the compressor for several hours in a row, and the temperature inside the chamber is lower than necessary, this is a clear sign of a malfunction.
There is a simple test method that does not require special tools. Unplug the device, wait 10-15 minutes, and then turn it on again. If, after turning on, the motor starts and does not turn off for more than 40-50 minutes, creating a feeling of endless operation, then the system does not receive a signal that the target temperature has been reached.
⚠️ Attention: If the refrigerator body (especially the side walls) gets very hot, but it is not cold enough inside, this may indicate a refrigerant leak or a clogged system. Operation in this mode is dangerous for the compressor.
It is also worth listening to the sounds of operation. A normal hum should be smooth and quiet. If you hear clicks, whistles or an excessively loud hum that does not stop, this is a reason for immediate diagnosis. A critical sign is the situation when the refrigerator operates for days, but the temperature in the main chamber does not drop below +10°C.
The influence of external factors and improper operation
Not always The reason for continuous operation is a technical breakdown of internal components. Often the problem lies in the operating conditions or the actions of the user himself. Before calling a specialist, it is worth eliminating trivial errors that can easily be corrected with your own hands.
One of the most common reasons is a violation of the rules for loading cameras. If you put a large amount of warm food inside or put a hot pan inside, the refrigerator will work hard trying to cool the volume. Also, a dense load that blocks air circulation prevents the sensors from reading the temperature correctly.
The second important factor is the location of the equipment. If the refrigerator is placed close to the wall, in a niche without gaps for ventilation, or next to heating devices, heat exchange is disrupted. The compressor cannot effectively remove heat through the condenser (grid at the back or on the sides), which is why the system works without stopping.
- 🌡️ Check the room temperature: if the room is hotter than +30°C, the refrigerator will work almost without interruption, this is a physical feature of the compressor.
- 🚪 Make sure the door fits tightly to the body: loose hinges or a dirty seal allow warm air to pass through, forcing the motor to work constantly.
- 🧊 Do not overload the freezer: excess ice on the walls (in models without No Frost) impairs heat dissipation and makes the sensors “think” that there is not enough cold.
Another nuance concerns the operating mode. If you have just defrosted your refrigerator or moved it, it may take up to 24 hours for it to return to normal. At this time, it may not turn off, gaining temperature “from scratch.”
Check the settings as well. Perhaps one of the household members accidentally activated the “Super Freeze” mode (usually indicated by a snowflake or button Super Freeze). In this mode, the refrigerator operates continuously, ignoring the thermostat readings, until the timer turns off the function or you do it manually.
Malfunctions of the thermostat and temperature sensors
If external factors are excluded, the problem most likely lies in the “brains” or “nervous system” of the refrigerator. A thermostat (thermostat) is a device that is responsible for turning the compressor on and off depending on the temperature in the chamber. It is he who gives the command: “It’s cold enough, you can rest.”
If the thermostat breaks down, the contacts may “stick” in the “on” position. In this case, the compressor receives current constantly and operates until it burns out or is disconnected from the network by the owner. In mechanical models, this is a common problem that can be solved by replacing the part.
In more modern electronically controlled models, air temperature sensors play the role of a thermostat. If such a sensor fails or gives incorrect readings (for example, it shows +5°C when in reality it is +15°C), the control board will constantly keep the compressor on.
Diagnostics of these components requires a multimeter. The wizard “rings” the thermostat contacts at different temperatures. If the circuit does not open when cooling, the part must be replaced. For electronic systems, the integrity of the wires going to the sensor is also checked, as they could be frayed or oxidized.
⚠️ Attention: Independent replacement of the thermostat in refrigerators, where the capillary tube of the thermal balloon is mounted in the foamed part of the case, is extremely difficult and can lead to damage to the insulation. In such cases, it is better to contact the service.
Symptoms of a sensor malfunction are often accompanied by erroneous readings on the display (if there is one) or their complete absence. Sometimes the refrigerator can begin to freeze to the point of a “glacier”, since it simply does not “understand” that it is already at the desired temperature.
Problems with circuit tightness and freon leakage
One of the most serious and common reasons for continuous operation is a refrigerant (freon) leak. The operating principle of the refrigerator is based on gas circulation in a closed loop. If a microscopic hole appears in the system, the gas begins to evaporate.
When freon becomes scarce, the pressure in the system drops. Sensors detect that the temperature does not drop to a predetermined level and give the command to the compressor to continue working. The motor tries to compensate for the lack of refrigerant by running for a long time, but the cooling efficiency drops.
A leak can occur anywhere: in the sealed seams of the evaporator, at the joints of the tubes, or even as a result of corrosion of the metal housing (especially in models with a “hidden” foamed evaporator). Owners often notice that the refrigerator is humming, but hardly freezing, or freezing only in one corner.
The repair process in this case is complex and consists of several stages:
- 🔍 Finding the leak using a leak detector or using nitrogen pressure testing.
- 🔧 Soldering the damaged area or replacing a unit (for example, an evaporator).
- 💨 Evacuating the system to remove moisture and air.
- ⛽ Refilling with a new portion of freon strictly according to the scale according to the manufacturer's instructions.
It is important to understand that simply “add freon” without finding and eliminating the leak is temporary and ineffective solution. The gas will come out again through the same hole, and the compressor will continue to operate in emergency mode.
An indirect sign of a leak may be swelling of the side walls of the refrigerator (in some models) or the appearance of yellowish rust spots in the places where the tubes are soldered at the back of the unit.
Clogged capillary tube and compressor malfunction
Another technical reason why the refrigerator does not turn off is a clogged capillary tube. This is a thin element through which the refrigerant enters the evaporator. Over time, microscopic particles of debris, paraffin plugs or ice blockages may form in the system (if there is moisture in the system).
When clogged, the circulation of freon is disrupted. The compressor tries to push gas, working with increased load, but no cooling occurs. The thermostat does not see a decrease in temperature and does not give a command to turn off. In such cases, you can often hear the motor humming, but the refrigerator itself is silent and does not cool.
The wear of the compressor itself deserves special attention. Over time, the mechanical parts of the motor wear out and the pumping performance decreases. An old compressor can run for hours to do the amount of work that a new one would do in 15 minutes. This is called “loss of productivity.”
To diagnose a blockage, technicians use a pressure gauge station. It shows the discharge and suction pressure. The characteristic behavior of the pressure gauge needles immediately indicates a blockage in the system. Treatment usually involves purging the system with nitrogen under high pressure or, in difficult cases, replacing the filter drier and capillary tube.
If the problem is in the compressor (for example, inter-turn short circuit of the windings or production of mechanical pairs), then its repair is usually impractical. The unit is completely replaced with a new or refurbished analogue.
It is worth noting that replacing a compressor is an expensive procedure that requires professional equipment for soldering and refilling. It is almost impossible to do this work efficiently on your own.
Comparative table of symptoms and causes
To make it easier for you to navigate possible malfunctions, we have prepared a summary table. It will help to compare the observed symptoms with the most likely causes of the breakdown.
| Symptom | Probable cause | Difficulty of repair | Need for a technician |
|---|---|---|---|
| Humming, but not cold, warm inside | Freon leak or blockage | High | Required |
| Freezing too much, ice on food | Thermostat/sensor is faulty | Average | Desirable |
| Works without interruption, but cools normally | Problem with the seal or heat in the room | Low | Not required |
| Strong heating of the side walls | System clogged or leakage | High | Required |
| Clicks and buzzing, then silence | Malfunction of the compressor start relay | Average | Desirable |
The table shows that external manifestations are often similar, but the reasons can be radically different. For example, in the event of a leak or a blockage, the refrigerator may not turn off, but the repair tactics will be different.
Pay attention to the details: where exactly it is warm or cold, whether there are any extraneous sounds, how long ago the problem began. These nuances will help the technician make a diagnosis faster over the phone or during the first visit.
Algorithm of actions when a malfunction is detected
If you realize that the refrigerator does not turn off for a technical reason, you need to act quickly to prevent failure of expensive components. The first step should always be to completely defrost the device.
Unplug the refrigerator, remove all food and leave the doors open for at least 12 hours (preferably for a day). This is necessary so that all the ice that could have formed in hidden cavities evaporates, and the system “rests.” Sometimes, after a long defrosting, the equipment begins to work correctly, if the problem was micro-clogging of the capillary with ice.
If, after turning on, the refrigerator starts working again without interruption, follow these steps:
- Check the tightness of the door and the cleanliness of the seal.
- Make sure that the equipment stands evenly and does not overheat at the back.
- Check whether the super-freezing mode is turned on.
- Evaluate the temperature in the chamber: if it is low and the motor is humming, change the thermostat. If the temperature is high, look for a leak or blockage.
Further actions depend on your skills. Replacing the thermostat in some models (Atlant, Beko) is available to a home craftsman with a minimum set of tools. However, working with freon, soldering tubes and the electrical part of the compressor requires a license and special equipment.
⚠️ Attention: Freon used in modern refrigerators, although considered safe for the ozone layer, in high concentrations can be hazardous to health. Additionally, handling pressurized gas without proper training may result in personal injury. Do not try to open the sealed circuit yourself.
When calling a technician, be sure to describe all the symptoms: how long it works without shutting down, what the temperature is inside, whether there have been power surges. This will help the specialist take with him the necessary spare parts and tools.
☑️ Diagnostics before calling the technician
Prevention and extension of service life
To avoid situations where the refrigerator works without stopping, it is important to follow the operating rules. Regular defrosting (for drip systems) and cleaning the drainage hole prevents the formation of ice plugs.
Monitor the condition of the sealing gum. Wash it periodically with warm water and soap and check for cracks. If the elastic band has lost its elasticity, it is better to replace it, since warm, moist air constantly enters the chamber through the cracks.
Do not put hot foods in the refrigerator. Let them cool to room temperature. This will not only save the motor from overload, but will also preserve the freshness of other products that may spoil due to a local increase in temperature.
Why can’t you put hot food in the refrigerator?
The entry of a hot object causes a sharp jump in temperature and humidity. Sensors detect heat and turn on the compressor at full power. Moisture condenses on the walls, forming an ice crust that disrupts heat transfer. As a result, the refrigerator runs longer, and food spoils faster.
It is also important to ensure good ventilation around the cabinet. The distance to the walls should be at least 5-7 cm. Periodically (every six months or a year) vacuum the rear grille of the condenser if it is open. The layer of dust acts as a heat insulator, interfering with heat removal.
Following these simple recommendations will significantly extend the life of your refrigerator and avoid costly repairs associated with overheating and compressor wear.
Frequently asked questions (FAQ)
How long does the refrigerator last? should it work without interruption normally?
In normal mode, the operating cycle is approximately 15-25 minutes, followed by a pause of the same duration. If the refrigerator operates for more than 40-50 minutes in a row, this is already considered a deviation from the norm that requires attention.
Can the refrigerator not turn off due to a power surge?
Yes, a strong voltage surge could damage the control board or compressor electronics. If, after a surge in light, the equipment behaves inappropriately, diagnostics of the electrical part by a specialist is necessary.
Is it dangerous to leave a refrigerator running without stopping overnight?
Short-term operation (several hours) will not lead to instant failure, but long-term operation (a day or more) without interruption can cause overheating of the compressor windings and its combustion. It’s better to turn off the device before the technician arrives.
Why doesn’t the new refrigerator turn off the first day?
This is normal. After turning on for the first time or after a long defrosting, the refrigerator needs time to cool the entire volume of chambers and food to the set temperature. During this period, it can work without interruption for up to 24 hours.
Is it possible to replace the thermostat yourself?
In mechanical refrigerators, where the thermostat is located in an accessible place (often in the lampshade or on the panel), replacement is possible with your own hands. In complex models with electronics or hidden installation, it is better to entrust this to professionals.