The situation when a household refrigerator starts working almost without interruption often takes owners by surprise. The hum of a compressor, which either dies down or increases again, can signal various problems: from a banal violation of operating rules to a serious breakdown in the cooling system. If you notice that the refrigerator often turns on and its operating cycle has become noticeably longer than usual, you cannot ignore this symptom, since this is a direct path to failure of an expensive compressor.
Constant operation of equipment leads to increased energy consumption and accelerated wear of mechanical components. In some cases, the unit may simply stop freezing and the food will begin to spoil. To understand why the refrigerator does not turn off or it works with short pauses, it is necessary to carry out an initial diagnosis of the condition of the device and analyze the conditions of its use.
In this article we will analyze in detail the main reasons for this behavior of the equipment, methods for troubleshooting yourself and situations where you can no longer do without calling a technician. Understanding the principles of operation refrigeration circuit will help you quickly identify the problem and avoid unnecessary expenses on repairs.
Violation of operating and placement rules
Before sounding the alarm and looking for technical faults, it is worth eliminating the human factor. Very often reasons for frequent switching on the problem lies in the incorrect location of the unit or a violation of the temperature regime inside the chambers. A refrigerator is a thermodynamic machine, the efficiency of which directly depends on environmental conditions.
The first thing you need to pay attention to is the distance to walls and heating devices. If the appliance is installed close to a wall or next to a stove, the radiator on the back wall cannot effectively transfer heat. As a result compressor he is forced to work longer to compensate for insufficient heat transfer. It is also important to check whether the body is exposed to direct sunlight, which is especially important in the summer.
⚠️ Attention: The minimum distance from the back of the refrigerator to the wall should be at least 7-10 cm to ensure normal air circulation.
The second important aspect is the tightness of the cameras. If you open the door often and for a long time, warm, moist air enters. Sensors detect an increase in temperature and give a command to start the engine. A similar effect is caused by placing hot or warm foods into the chamber, which must first be cooled to room temperature.
Problems with sealing rubber
One of the most common reasons why the refrigerator does not turn off for a long timeis the loss of tightness of the doorway. The rubber seal (cuff) loses elasticity over time, cracks or becomes deformed. Through the resulting cracks, cold air goes outside, and warm air is constantly sucked in.
As a result, the thermostat or electronic control module constantly receives a signal that the temperature in the chamber is above the established norm. The compressor turns on, tries to cool the volume, but due to the constant leakage of cold, it cannot reach the specified mode and goes into pause. This leads to non-stop operation.
You can check the condition of the seal visually and tactilely. Run your hand along the perimeter - if you feel drafts, it means the seal is broken. You can also use a simple test with a sheet of paper: clamp the sheet with a door in different places. If it comes out easily without resistance, it means that the fit in this place is insufficient.
- 🔍 Visual inspection: look for cracks, creases and areas where the rubber has moved away from the body.
- 🌡️ Temperature test: run your hand along the perimeter of the closed door to feel the cold leakage.
- 📄 Test with paper: the sheet should be removed with noticeable force along the entire perimeter.
If the rubber is simply dirty, it is enough to wash it with warm water and soap. In case of deformation, you can try to restore the shape by heating the problem areas with a hairdryer or pouring boiling water into them. However, if the material has become hard and brittle, only replacing the seal a new one will help.
How to install a new seal correctly?
To install a new seal, it is often recommended to keep it in warm water for about 30 minutes so that it becomes more elastic. You need to install it starting from the top corner, inserting it tightly into the groove along the entire perimeter. After installation, it is better to close the door for several hours for final shrinkage.
Malfunctions of the thermostat and sensors
The thermostat (thermostat) is the “brain” that controls the cycles of turning the compressor on and off in mechanical models. In modern models with a system No Frost and electronic control, this function is performed by air temperature sensors. If this element fails, the refrigerator no longer “understands” when it needs to stop.
If the thermostat breaks down, the contacts may “stick” in the closed position, sending a continuous signal to the compressor. In this case, the unit will freeze until the evaporator freezes or the emergency protection is triggered, but the cyclic operation will be completely disrupted.
In electronic models, a failure can be caused not only by the sensor itself, but also by the control board. Contact oxidation or voltage surges lead to incorrect data reading. Diagnosis of such faults requires the use of a multimeter and knowledge of the electrical circuits of a particular device.
meter and knowledge of electrical circuits of a particular device.
Symptoms of a malfunction of the thermostat can also be:
- ❄️ Excessive cooling: the food in the chamber freezes, although the mode has not changed.
- 🔌 No startup: the refrigerator does not turn on at all if the contacts are open.
- 🔄 Short cycles: the unit turns on for 1-2 minutes and immediately turns off.
Refrigerant leakage and problems with the compressor
A serious technical reason why the refrigerator works without interruptionis leakage freon (refrigerant). This can happen due to mechanical damage to the evaporator tubes (for example, careless defrosting with a knife) or due to metal corrosion. When the amount of freon in the system decreases, the pressure drops and the compressor cannot reach the required condensation temperature.
In an attempt to compensate for the lack of refrigerant and reach the set temperature, the motor wears out. Visually, this may manifest itself in insufficient cooling of the products, despite the constant hum of the motor. There may also be significant heating of the side walls or the condenser grille at the rear.
The compressor can also be the cause of the problem. Wear of the piston group, jamming of valves or loss of performance lead to the unit humming, but not cooling. In such cases, replacing the compressor or complex recharging of the system is often required.
⚠️ Attention: Refilling the refrigerator with freon yourself is prohibited and dangerous. To find leaks and refill, specialized equipment and a license are required.
Diagnosis of leaks is often carried out by exclusion or using a leak detector. The technician may notice oily spots at the joints of the tubes, which is a sure sign of a violation of the tightness of the circuit.
The influence of the No Frost defrosting system
In refrigerators with system No Frost an entire unit is responsible for heat removal and defrosting of the evaporator, including a heating element, a timer (or control board) and a defrost sensor. If one of these elements fails, the evaporator becomes covered with a “coat” of ice, which blocks the circulation of cold air.
The fan is moving air, but it is not cooling properly due to the ice blockage. Sensors detect the high temperature in the chamber and command the compressor to operate continuously. In this case, it can be relatively warm inside, and behind, on the evaporator, a huge lump of ice freezes.
Most often, the defrost heating element or the sensor that records the temperature of the evaporator fails. Less often, the problem lies in the timer, which simply does not switch the refrigerator to defrost mode. As a result, the unit operates in cooling mode 24 hours a day.
☑️ Diagnostics of the No Frost system
To check, you need to get to the evaporator (usually hidden behind a plastic panel in the freezer). The presence of a massive layer of ice will confirm a problem with the defrost system. Visually, the heating element may look intact, but when tested, show an open circuit.
Diagnostics and fault table
To systematize the knowledge gained and quickly determine the reason why The refrigerator often turns on, use the table below. It will help to compare symptoms with probable breakdowns.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Humming constantly, cold no | Freon leak, compressor malfunction | Call a technician to find the leak |
| Works without stopping, the chamber is warm | Door leakage, thermostat failure | Check the seal, replace the sensor |
| The back wall is severely frosted | Malfunction of the No Frost system (heating element, timer) | Defective defrost elements |
| Short cycles on/off | Start relay, problems with electronics | Replacing the start protection relay |
When carrying out diagnostics, always remember safety precautions. Any work related to electrical components should only be carried out with the device disconnected from the mains. If you are not confident in your abilities, it is better to entrust the repair to professionals.
⚠️ Attention: Before starting any diagnostics, be sure to disconnect the refrigerator from the power supply to avoid electric shock.
Frequently asked questions (FAQ)
Can a refrigerator work without stopping in the heat?
Yes, in extreme heat (above +30°C) it is more difficult for the refrigerator to release heat, and its operating time increases. However, it should still turn off periodically. If the pauses disappear completely, this is a sign of overload or malfunction.
How long should a refrigerator normally operate?
In normal mode, the operating coefficient is about 40-50%. This means that out of one hour he works for 20-30 minutes, and the rest of the time he rests. Depends on the model and load.
Is it dangerous if the compressor is hot?
The compressor heats up to 60-90 degrees during operation, this is normal. But if it is so hot that it is impossible to touch it, and the refrigerator does not turn off, this is an alarming symptom.
Why does a new refrigerator work longer than the old one?
Modern models often have longer operating cycles to save energy and better preserve food, but they must definitely take breaks. Constant work without stopping is not typical for new equipment.