The situation when a unit hums for days on end is familiar to many owners of household appliances. If you notice that the refrigerator operates without interruption, this is a signal that the system cannot reach the set temperature parameters. In normal operation, the compressor turns on and off cyclically, maintaining cold inside the chambers.
Constant operation of the motor leads to its overheating and rapid wear, as well as to a significant increase in electricity bills. Ignoring the problem can lead to costly compressor repair or complete replacement of the unit. In this article, we will analyze in detail why the equipment goes into non-stop mode and what you can do yourself.
The first thing you need to do is listen to the sounds of the operating device. If the hum is smooth but continuous, the problem may be with the settings or a freon leak. If a knocking or intermittent hum is heard, we are talking about a mechanical breakdown. A critical sign is heating of the compressor housing to a temperature above 70-80 degrees Celsius, which indicates operation at the limit of capabilities.
Improper installation and operating conditions
Often the reason lies not in a breakdown, but in a violation of installation rules. If the unit is installed close to a wall or in a niche without gaps, air circulation is disrupted. The radiator grille on the rear wall does not have time to cool down, and the sensors record the high temperature, forcing the engine to work without rest.
It is also worth checking the temperature in the room. If the kitchen is located on the sunny side or next to heating appliances, the load on the system increases significantly. In hot rooms in the summer, appliances can operate almost continuously, and this is considered acceptable for some models, but not for all.
Pay attention to the position of the door. If your kitchen floor is uneven, the door may not fit tightly, allowing warm air to pass through. In this case thermostat it will constantly require cooling. Check the horizontal installation using a building level.
Problems with the door seal
One of the most common The reason for ineffective operation is the loss of chamber tightness. The rubber seal (cuff) dries out, cracks or deforms over time. Through the resulting cracks, warm air constantly flows inside, which the cooling system tries to remove.
You can check the condition of the seal by a simple visual inspection or using a sheet of paper. Clamp the sheet with the door around the perimeter: if it comes out too easily, it means the fit is broken. Dirt and grease also worsen the elasticity of rubber, so regular cleaning the seal is mandatory.
⚠️ Attention: If the seal has lost elasticity and is covered with microcracks, washing will not help. A complete replacement of the part is required, since it is impossible to restore the rubber structure.
Sometimes the problem is solved by adjusting the door hinges. If the door itself is warped, even whole rubber will not provide a tight seal. In such cases, it is necessary to tighten the fasteners or replace the hinges if they are worn.
Malfunctions of the thermostat and temperature sensors
The thermostat is the “brain” of the system, which gives the command to turn the compressor on and off. If this element fails, it can constantly send a signal that the temperature in the chamber is higher than normal. As a result, the motor hums without stopping for a minute.
In modern models with electronic control, air controls are responsible for the temperature regime. temperature sensors. Their readings may be distorted due to oxidation of contacts or software failures of the control board. Diagnosis of such faults requires a multimeter and knowledge of electrical engineering.
Symptoms of thermostat failure are often accompanied by the absence of a click when the desired temperature is reached. If you hear the compressor running, but there is no characteristic shutdown sound, most likely the problem is in the regulator.
How to check a mechanical thermostat?
To check a mechanical thermostat, it can be removed and placed in a cold environment (for example, in a freezer) for 15-20 minutes. If a click is heard when removing and heating, the device is working properly. The absence of sound indicates a breakdown.
Refrigerant leak and system blockage
If the amount of freon in the circulation system has decreased, the refrigerator will work continuously, trying to compensate for the lack of refrigerant. Leakage can occur through microcracks in the evaporator tubes or due to corrosion. At the same time, cooling efficiency decreases, and food begins to deteriorate.
Another common problem is a clogged capillary tube. Plugs from moisture, oil or decomposition products of the filter element form in the system. The compressor is working hard, trying to push freon through the blockage, but there is no cold in the chambers.
Signs of a leak or blockage often include:
- 🧊 Weak cooling or its complete absence when the engine is running.
- 🔥 Strong heating of the side walls of the housing (the condenser overheats).
- 🔇 Complete absence of sound of gas flowing in the tubes (there should be a quiet gurgle).
- ❄️ Formation of an ice “coat” in only one corner of the freezer.
To eliminate these faults, you need to call a technician. It is impossible to independently find the location of the leak and fill the system with freon without special equipment. Moreover, inept actions can lead to complete failure of the compressor.
☑️ Diagnosis of freon leaks
Wear of the compressor and problems with the start relay
The compressor is the heart of the refrigerator. Over time, its resource is exhausted: the piston group wears out, compression decreases. The engine runs but does not create enough pressure in the system. He tries to compensate for this by continuous operation, but the efficiency drops to zero.
Often the culprit of continuous operation is the starting relay. This small element is responsible for starting the engine. If the relay contacts are stuck or burned, the engine may hum but not start, or may run jerkily without stopping. Replacing the relay is a simple and inexpensive procedure.
Comparative table of symptoms of malfunctions:
| Malfunction | Nature of motor operation | Temperature in the chamber | Additional signs |
|---|---|---|---|
| Freon leak | Works without stopping | Above normal (heat) | Hot sides, no cold |
| Thermostat is faulty | Does not turn off at all | Extreme cold or normal | No switch off click |
| System clogged | Buzzing, clicking possible | Warm or variable | Heating of the filter drier |
| Compressor wear | Works quietly or noisily | Does not cool | Overheating of the motor housing |
If you hear a loud knock when you try to start, and then silence, and this repeats cyclically, this is a sign of a compressor wedge or a serious electrical failure. In this case, operation is dangerous.
⚠️ Attention: If the compressor vibrates strongly and makes a metallic clanging sound, immediately unplug the device. Further operation may result in a fire or explosion of the refrigerant.
The influence of the “Super Freeze” mode and other functions
Sometimes panic occurs due to user inattention. Many models are equipped with a “Super Freeze” mode, which forcibly keeps the compressor on for a long time to quickly freeze large volumes of food. In this mode, the equipment does not turn off for hours.
Check the control panel: if the freeze indicator is on, it means the function is activated. In some older models, this mode is activated by a mechanical button, which is easy to touch accidentally. Disable the function, and after a few hours the operating cycle should return to normal.
It is also worth mentioning seasonal features. At the height of summer, when the room temperature exceeds +30°C, the refrigerator can operate up to 80% of the time. This is not a breakdown, but a feature of thermodynamics: the higher the temperature difference between inside and outside, the more energy is required to maintain cold.
Frequently asked questions and answers
Can an old refrigerator work without stopping and not break down?
Theoretically, it can, if it is working, but its resource in this mode will run out very quickly. Constant operation without rest cycles leads to overheating of the motor windings and oil burnout, which inevitably leads to major repairs.
Why does a new refrigerator work constantly on the first day?
When first turned on, the unit needs time to cool the entire internal volume and chamber walls. This process can take from 4 to 12 hours. If after this period the motor does not turn off, it is worth checking the temperature settings.
Is it dangerous to touch a running compressor?
Yes, the housing of a running compressor can heat up to 90 degrees and above. Touching may cause burns. In addition, there is freon under pressure inside the system, so any manipulation of the tubes without skills is prohibited.
What to do if the refrigerator hums but does not freeze?
This is a classic sign of a freon leak or a clogged system. It is necessary to turn off the device, defrost it (if there is ice) and call a specialist for diagnostics and refueling.
Does the amount of food in the refrigerator affect the operating time?
Yes, it does. An empty refrigerator cools faster, but also heats up faster when the door is opened. A unit loaded with food keeps the cold longer, but when initially loaded with warm food it will work longer than usual.