The situation when the refrigerator works without interruptionis familiar to many owners of household appliances. Normally, the compressor should turn on and off at certain intervals, maintaining a given temperature regime inside the chambers. If the motor hums for hours and there are no rest cycles, this indicates serious problems in the cooling system or a violation of operating conditions.
Constant wear and tear leads to rapid overheating of the engine and a reduction in its service life. Compressor, designed for cyclic load, can burn out in a matter of minutes days if the cause of the failure is not identified. In this article, we will look in detail at why equipment behaves this way and what steps need to be taken.
The first thing to do is to evaluate external factors that are often ignored. Perhaps the room is too hot or the air circulation around the case is impaired. Modern inverter models can work longer than usual, but they should not buzz for 24 hours without pauses. Let's look at the main scenarios of breakdowns and user errors.
Poor door fit and leakage cold
One of the most common reasons for continuous operation is a violation of the tightness of the chambers. If sealing rubber is worn out, dirty or deformed, warm air constantly penetrates inside. Sensors detect an increase in temperature and command the compressor to work without stopping.
Check whether the door closes tightly. Sometimes the problem lies not in the rubber itself, but in skewed hinges or foreign objects that prevent a tight fit. Even a small gap of a few millimeters can disrupt heat transfer the entire volume of the chamber.
- 🔍 Visually inspect the seal around the entire perimeter for cracks, tears or sticky deposits.
- 🧊 Carry out a test with a sheet paper: clamp it between the door and the body; if it pulls out easily, the seal is broken.
- 🧹 Clean the rubber with warm water and soapy water to remove grease and dirt that reduce adhesion.
⚠️ Attention: If the seal has simply moved away from the body, it can be carefully glued with special glue for rubber, but if the material cracked - a complete replacement of the part will be required.
To restore the tightness, sometimes it is enough to simply align the door by adjusting the fastening bolts. However, if magnetic tape the rubber inside has lost its properties, only installing a new set of seals selected for your model will save you.
Malfunction of the thermostat or temperature sensor
The thermostat is the “brain” system that decides when to turn the motor on or off. If this element fails, it can send false signals that the chamber is not cold enough. As a result, compressor continues to work, trying to achieve a non-existent goal.
In older models of mechanical refrigerators, the thermostat is a device with a capillary tube that responds to changes in freon pressure. Over time, the mechanism may become stuck in the “on” position. In electronic models, they are responsible for this NTC sensors, which may produce incorrect resistance readings.
Diagnostics of the thermostat requires certain skills. Often, technicians temporarily close the relay contacts to check, but at home it is safer to check the resistance with a multimeter. If the device shows a break or short circuit, the part must be replaced.
- 🛠️ To replace a mechanical thermostat, you need to remove the regulator handle and unscrew the fastening nut.
- 📉 In electronic models, the sensors are often located behind the back wall or in the air duct.
- 🔌 Before any diagnostics, be sure to disconnect the refrigerator from the power supply.
⚠️ Attention: Never leave a refrigerator with a faulty thermostat on for a long time. Food may freeze, and the compressor may burn out from overheating.
Replacing the thermostat is one of the most common procedures in refrigerator repair. This is a relatively inexpensive part, but its failure leads to colossal energy bills. If after replacement the problem persists, it is worth checking the control circuit.
Refrigerant (freon) leakage
If the refrigerator hums, but does not freeze or freezes very weakly, there is a high probability of a leak. refrigerant. Freon circulates in a closed loop, and in good condition its quantity does not change for years. However, microcracks in the tubes of the evaporator or condenser can lead to a gradual release of gas.
If there is insufficient amount of freon, the system cannot build up the required pressure to turn off the compressor. The engine is running at its limit, trying to compensate for the lack of refrigerant. This is a critical situation that requires professional intervention.
| Symptom | Description of the symptom | Probability |
|---|---|---|
| Hot condenser | The rear grille is cold or warm only in entrance | High |
| Frost in the chamber | The appearance of a “snow coat” in one corner | Medium |
| Noise during operation | Gurgling or hissing instead of a smooth hum | High |
| Lack of cold | Food spoils, despite the motor running | Critical |
It is almost impossible to find the leak location on your own without special equipment, such leak detector or an ultraviolet lamp with dye. Craftsmen use nitrogen to pressurize the system to detect fistulas.
Is it possible to refill the refrigerator yourself?
Refilling it yourself with freon is highly not recommended. Requires evacuation of the system, precise dosage of oil and refrigerant, as well as special equipment. An error will lead to failure of the compressor.
After eliminating the leak, the system must be evacuated to remove moisture and air, and then filled with new freon. Using the wrong type of refrigerant or violating the dosage can destroy the compressor.
Problems with the No Frost system and defrosting
In refrigerators with a system No Frost continuous operation of the compressor is often associated with a malfunction of the evaporator defrost system. If the heating element, defrost thermostat or timer (control module) does not start defrosting, a coat of ice builds up on the evaporator.
Ice blocks the circulation of cold air. The sensors in the main chamber do not detect a decrease in temperature and keep the compressor on. In this case, it may be cold in the freezer, and warm in the refrigerator compartment.
- ❄️ Defrost the refrigerator completely (at least 24 hours with the doors open).
- 🔌 After defrosting, turn on the appliance and check if the shutdown cycle appears.
- 🌡️ If the problem returns after 1-2 weeks, one of the defrost elements is faulty.
☑️ Diagnostics of the No Frost system
Most often, the defrosting heating element or the sensor that should signal the completion of defrosting fails. In some models Samsung or LG the defrost system fuse may burn out, which completely blocks defrosting.
If you ignore this problem, ice can completely block the fan, causing it to break or the blades to become deformed. In addition, constant wear and tear will shorten the life of the compressor.
Stuck compressor start relay
The start relay is responsible for starting the compressor engine. If the contacts inside the relay are oxidized or burnt, they may become stuck in the closed position. In this case, the current continues to flow to the motor windings even after reaching the desired temperature.
Visually this is manifested by the fact that the refrigerator does not turn off, although it is already very cold inside. Sometimes the relay may make a characteristic click, but not open the circuit. This device is inexpensive, but its failure is dangerous for the motor.
To diagnose the relay, it must be removed and shaken. If a knock is heard inside, it means that the mechanical part is intact, but this does not guarantee the serviceability of the electrical contacts. It is best to “ring” the contacts with a tester or replace the part with a new one.
⚠️ Attention: Operating a refrigerator with a faulty start relay can lead to burnout of the compressor windings, the repair of which is often not economically feasible.
Replacing a relay is a simple procedure that takes 10-15 minutes. The main thing is to choose an analogue with exactly the same characteristics indicated on the body of the old device. Different models of compressors require different types of starters.
The influence of external temperature and placement
Sometimes the reason lies not in the breakdown, but in the operating conditions. If the refrigerator is located next to a radiator, stove, or in direct sunlight, it cannot effectively give off heat. Heat transfer is disrupted, and the motor is forced to work constantly.
It is also important to maintain the gaps between the back wall of the refrigerator and the wall of the room. The minimum distance should be 5-7 cm for free air circulation. If the refrigerator is built into a niche, the ventilation requirements are even stricter.
In the summer, when the apartment is hot, the refrigerator may work longer than usual. It is normal for shutdown cycles to occur, even if they are rare. However, if it does not turn off completely even at night, when the room is cool, look for a malfunction.
Check whether the refrigerator is loaded with too hot foods. Placing a pot of soup inside will cause the appliance to work at maximum for several hours until the temperature stabilizes.
When professional repairs are required
If simple methods like defrosting, adjusting the temperature and checking the seal do not help, most likely a complex repair is required. Diagnostics of hidden components, such as control module or a sealed circuit, requires special equipment.
Service center technicians use pressure gauge stations to check pressure, leak detectors to search for leaks and electronic testers to check control units. Self-repair in such cases can be dangerous and expensive.
It is worth considering that modern refrigerators with inverter compressors can work longer than usual, maintaining the temperature by changing the motor rotation speed. They rarely turn off completely, but only reduce speed. This is normal operation and not a breakdown.
In conclusion, constant operation of the refrigerator is a signal that cannot be ignored. Timely contact with specialists or competent self-diagnosis will help you avoid costly replacement of the compressor or purchase of a new unit.
FAQ: Frequently asked questions
Is it normal for a new refrigerator to work for a long time when first turned on?
Yes, when first started, the refrigerator takes from 4 to 12 hours, to reach operating temperature in all chambers. During this time, the compressor can operate continuously. If after setting the temperature it does not turn off, this is a cause for concern.
Can the refrigerator not turn off due to incorrect temperature settings?
Yes, if you set the “Super Freeze” mode or set the minimum temperature (for example, +1°C), the compressor will work almost without interruption. Try returning the settings to standard values (+3...+5°C).
Why did the old refrigerator stop turning off after defrosting?
If the situation has not changed after defrosting, the problem probably lies in a freon leak or a malfunction of the thermostat. Defrosting only helps if the capillary is clogged with ice (ice jam), but if the cause is deeper, repairs are needed.
How long should the compressor rest?
In normal mode, the compressor operates for about 10-20 minutes, followed by a pause of 15-30 minutes. The ratio of work and rest time depends on the load of the chambers and the temperature in the room.