Situation, when the refrigerator operates without interruption, is familiar to many owners of household appliances. A unit humming around the clock not only creates a constant background noise, but also leads to a sharp increase in electricity bills. Moreover, the continuous operation of the motor-compressor indicates that the cooling system cannot reach the set temperature parameters inside the chambers.
Ignoring this problem can lead to serious consequences. The constant load on the units of the device causes their accelerated wear, and in the worst case, complete failure of the expensive compressor. It is important to understandthat even modern models equipped with inverter motors should not hum 24 hours a day without pauses, unless you have just loaded them with a huge amount of warm products.
Before you panic or call a technician, you need to conduct an initial diagnosis. Often the reason lies in trivial things that can be easily fixed on your own without resorting to complex repairs. In this article, we will analyze in detail all possible causes of malfunction, from improper operation to technical breakdowns, and will tell you what to do in each specific case.
Violation of operating rules and external factors
Before looking for complex technical malfunctions, it is worth analyzing the conditions in which it is located domestic refrigerator. Often the reason for continuous operation is a banal violation of operating rules, which can be easily corrected on your own. For example, if the unit is installed close to a wall or in a niche without gaps for ventilation, heat transfer is disrupted.
The compressor tries to cool the chambers, but due to poor heat removal from the condenser (grids at the back), efficiency drops. As a result, the sensors record an insufficiently low temperature and do not give a command to turn off the motor. It is also worth checking the tightness of the door seals: if the rubber is worn out or dirty, warm air constantly flows inside, forcing the equipment to work in increased mode.
⚠️ Attention: If you have recently moved the refrigerator or carried out general cleaning, make sure that the gap between the back wall of the device and the wall is at least 5-7 centimeters for free circulation air.
Another common scenario is loading a large volume of warm food or a door that is not tightly closed. In such cases, the system simply does not have time to cope with the heat flow. Thermoregulator continues to keep the circuit closed, waiting for target values to be achieved, which is physically impossible in these conditions.
Malfunctions of the thermostat and temperature sensors
One of the most common technical reasons why refrigerator does not turn off is the failure of the thermostat (thermostat). This small element is responsible for controlling the temperature inside the chamber and sending a signal to turn the compressor on or off. If the contacts inside the thermostat “stick” in the closed position, the motor will run indefinitely.
Modern electronically controlled models use air temperature sensors instead of a mechanical thermostat. They can transmit incorrect data to control module, reporting that the chamber is warm, although in fact the cold has already been reached. Diagnostics of these elements requires special instruments, such as a multimeter, to check the resistance.
- 🔍 Mechanical thermostat: Checked by testing contacts at different temperatures; often fails due to the exhaustion of the spring life.
- 🌡️ Electronic sensor: Changes its resistance depending on the heating; in the event of an open circuit or short circuit, the refrigerator goes into emergency mode or operates without stopping.
- ⚙️ Control module: It may incorrectly process signals from working sensors due to power surges in the network.
Replacing the thermostat is a procedure available for a person with basic repair skills, but requiring precision. It is necessary to select an analogue with exactly the same characteristics, otherwise the temperature regime will be disrupted. In electronic models, it is often necessary to reflash or replace the entire control unit if the track responsible for reading the readings has burned out.
Refrigerant leakage and problems with compressor
If the refrigerator hums, but does not cool or cools very weakly, while working around the clock, there is a high probability freon leaks. The refrigerant is the working fluid of the system, which circulates through the tubes, picking up heat. When its amount in the circuit decreases, performance drops, and the compressor is forced to work without interruption, trying to compensate for the lack of substance.
It is important to note that it is impossible to simply “finish” freon into the system. First you need to find the leak, fix it, and only then refill the device. Leaks often occur in places where tubes are soldered, in the foamed part of the body (European) or in the evaporator. It is almost impossible to find a microcrack on your own without a leak detector.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Humming, but no cold | Complete leak freon | Call a technician, search for leaks, refill |
| Weakly freezes, works non-stop | Partial leak or blockage | Diagnostics of pressure in the system |
| Buzzing and gets very hot at the back | Compressor malfunction | Checking the starting relay and windings |
In addition to the leak, the problem may lie in the compressoritself. If its compression has dropped (piston group wear) or the valves are jammed, it will drive freon ineffectively. The pressure in the system will not rise to the required level, the sensors will not detect the cold, and the motor will work until the windings are completely burned out.
⚠️ Attention: If you hear clicks when you try to start or the humming suddenly stops and then repeats again after a minute, immediately disconnect the device from the network. This is a sign of a malfunction of the starting relay or compressor.
Clogged capillary tube and filtration system
Another technical reason for endless operation is clogged capillary tube. This is a thin copper pipe in which there is a sharp drop in refrigerant pressure. Over time, microscopic particles of debris, oxides or ice plugs (if there is moisture in the system) may form in the system, which block the freon flow.
When clogged, the circulation of the refrigerant is disrupted. The compressor works, creating pressure, but freon cannot fully circulate throughout the circuit. As a result, the evaporator does not cool, the temperature in the chamber does not drop, and thermostat does not open the circuit. Often, the condenser (grid at the back) remains cold or only partially warm.
Removing a blockage is a complex procedure that requires:
1. Disabling and cutting off the filter drier.
2. Purge the circuit with nitrogen under high pressure.
3. Replacing the filter-drier with a new one (the old one cannot be used).
4. Evacuating the system and charging with freon.
What is a filter drier and why is it needed?
A filter drier is a cylinder installed in front of the capillary tube. It retains moisture and mechanical impurities. If it is not changed during repairs, moisture will again enter the system and cause an ice plug or an acid reaction that destroys the compressor from the inside.
Failures in the electronic control module
In new generation refrigerators, especially with the system No Frost and displays, the electronic control module is responsible for all processes. This is the “brain” of the device, which reads sensor readings and controls the compressor, fans and defrost heating elements. If the electronics fail, they may send incorrect commands.
For example, the module may “think” that a quick freezing process is in progress and force the compressor to be turned on. Or the triac that controls the motor burns out, and it is constantly in a closed state. In such cases, the refrigerator may freeze normally, but simply not turn off when commanded.
Diagnostics of the module requires knowledge in electronics. Visually, you can notice swollen capacitors or blackening on the board, but often the defects are hidden. Repairing the module is possible, but it is often easier and more reliable to replace the entire board with an original or compatible one.
- 💡 Power surges: A common cause of failure of the electronic components of the control module.
- ❄️ Moisture: Condensation that gets onto the board during defrosting can cause a short circuit tracks.
- 🔄 Program failure: Sometimes a complete reset (reboot) helps by disconnecting from the network for 15-20 minutes.
⚠️ Attention: Before replacing the control module, be sure to check the integrity of all sensors and wiring. Installing a new board on faulty sensors can lead to repeated failure of the electronics.
☑️ Primary diagnostics of the refrigerator
When you need to call a technician
Independent repair of a refrigerator is possible only in a limited number of cases, such as replacing a thermostat, seal or light bulb. However, if the problem lies in refrigeration circuit (leakage, blockage) or complex electronics, the intervention of an unqualified person can only aggravate the situation.
Specialists have the necessary equipment: leak detectors, vacuum pumps, pressure gauge stations and kits for rations. They can accurately determine system pressure, find microscopic leaks, and safely replace refrigerant while complying with environmental regulations.
Plus, professional repairs come with a guarantee. If, after self-refilling with freon, the refrigerator stops working in a week, there will be no one to blame. The craftsmen are responsible for the quality of the work performed and the spare parts used.
Frequently asked questions (FAQ)
How long should the refrigerator operate normally?
In normal operation, the refrigerator should turn on and off cyclically. The working time is usually from 15 to 30 minutes, followed by a pause (rest) of approximately the same duration. The normal working time factor (WFC) is about 40-50%. If the device works for 40 minutes and stops for 5 minutes, this is an alarming signal.
Can the refrigerator not turn off in the summer?
In the summer, when the room temperature is high, the intervals between turns on may be shortened, and the operating time may increase. However, even in the heat of +30°C in the room, the refrigerator must turn off. If it hums for days, it means that the system cannot cope with the heat flow due to a malfunction or poor ventilation.
Is it dangerous to leave a refrigerator running without stopping?
Yes, it is dangerous. The compressor is not designed for continuous operation. In the best case, the motor winding will burn out, and an expensive compressor replacement will be required. In the worst case, the wiring insulation may melt, which can lead to a short circuit and fire.
Why does a new refrigerator work without interruption?
A new refrigerator, when turned on for the first time or after a long defrosting, can work for several hours (up to 12-24 hours) without interruption. This is normal: it must “get cold” from scratch. If it does not turn off for the second day, this is a defect or a violation of the installation rules.
Does the number of products affect the operating time?
Yes, it does. A fully loaded refrigerator takes longer to cool down when first turned on, but it operates more stable in temperature maintenance mode. An empty refrigerator heats up faster when the door is opened, but it also cools down faster. The main thing is not to block the ventilation holes inside the chambers with food.