The situation when the refrigerator does not stop workingis familiar to many owners of household appliances. Instead of the usual on and off cycle, the unit hums for days on end, trying to achieve the set temperature indicators. This not only leads to a sharp increase in electricity bills, but also creates constant background noise that interferes with comfortable living in the apartment.
The first thing to do when such a problem is discovered is not to panic and carry out an initial diagnosis. Often the reason lies not in a complex breakdown of the electronics or motor, but in simple operating errors or external factors. Understanding the principles of operation refrigeration circuit will help you quickly determine whether you need to call a technician or the situation can be corrected yourself in a few minutes.
In this article we will analyze in detail all the possible reasons for the continuous operation of the compressor, from simple misunderstandings to serious malfunctions. You will learn how to check the tightness of the seal, why you should not put hot foods on the shelf and when exactly you need to sound the alarm if you notice an ice crust on the back wall.
Operation errors and external factors
Before looking for a breakdown inside the system, it is worth analyzing the conditions in which your refrigerator is located. Quite often compressor it does not turn off because heat from outside enters the chamber faster than the unit can remove it. This forces the cooling system to work non-stop, trying to compensate for heat inflows.
One of the most common reasons is improper installation of equipment. If the refrigerator is standing close to the wall, in a niche or too close to heat sources (stove, battery), the (heat transfer) of the condenser is disrupted. Black radiator on the back panel it simply does not have time to cool down, and the sensors record the high temperature, not allowing the motor to rest.
⚠️ Attention: The distance from the back of the refrigerator to the wall must be at least 5–7 centimeters to ensure normal air circulation. Ignoring this rule will lead to overheating of the compressor.
It is also worth checking the tightness of the door. If sealing rubber the magnet is dirty, damaged or simply does not hold, warm air constantly penetrates inside. In response to this, the temperature sensor gives a command to cool, and the cycle is not interrupted. You can check the tightness using a simple sheet of paper: clamp it with the door and try to pull it out - if the sheet moves freely, the tightness is broken.
The influence of the operating mode and loading of cameras
Another factor that is often overlooked is the volume and temperature of loaded products. If you've just returned from the supermarket and filled your empty refrigerator with warm food, it will take a significant amount of time for the system to cool everything down. In such cases quick freezing mode or simply intensive work for several hours is the norm.
However, if you regularly load hot or warm dishes, the refrigerator will work almost non-stop. This creates a colossal load on the refrigerant compressor, reducing the service life of the equipment. The warm air inside the chamber rises, creating an uneven temperature background, which confuses the thermostat.
In addition, it is important to take into account the seasonal factor. In the summer, when the ambient temperature is high, it is more difficult for the refrigerator to transfer heat to the room. If the room is hotter than +30°C, the compressor operating time may increase to 80% of the total time, which is sometimes perceived by users as a malfunction.
Malfunctions of the thermostat and temperature sensors
If external factors are excluded, the next probable cause is the failure of the temperature controls. Thermoregulator (thermostat) is a device that monitors the temperature inside the chamber and opens the electrical circuit when the required minimum is reached. If its contacts are stuck or it fails, the signal to turn off the compressor simply does not arrive.
In modern models with a system No Frost and electronic control, instead of a mechanical thermostat, temperature sensors (thermistors) are used. They transmit data to the main control module. If the sensor “lies” and shows that it is warm in the chamber, although in fact there is already a sub-zero temperature, the refrigerator will freeze to the bitter end until slush of ice forms.
Diagnostics of the thermostat in mechanical models is often carried out by the method of elimination or direct replacement of the element. Electronic models require testing the sensors with a multimeter and checking their resistance at different temperatures. A malfunction of this unit is often accompanied by the absence of a click when turning the knob.
How to check a mechanical thermostat?
To check, you can close the thermostat contacts directly. If the compressor starts when it is closed, but when it opens it stops (in some circuits) or continues to work, but the operating pattern changes, this will indicate a problem in the control circuit. However, it is safest to replace the part with a known good one.
Problems with the door seal and tightness
We have already mentioned the seal in the context of operating errors, but it is worth considering its wear and tear as a technical malfunction. Over time rubber seal loses elasticity, cracks or deforms. In places of deformation, micro-cracks are formed through which there is a constant flow of warm, moist air.
Signs of depressurization can be not only the continuous operation of the motor, but also the formation of ice in places, as well as fogging of the ends of the shelves next to the door. In refrigerators with No Frost this can lead to more frequent defrosting cycles, which the system does not have time to fully complete.
The properties of the seal can sometimes be restored using silicone grease or short-term exposure to hot water (hairdryer) to straighten the creases. However, if the rubber is cracked or the magnetic tape inside is weakened, only complete replacement of the element will help.
| Symptom | Probable cause | Action |
|---|---|---|
| The refrigerator hums, but does not freeze | Freon leak or compressor breakdown | Call a technician to find the leak |
| The motor runs constantly, extreme cold | The thermostat or sensor is faulty | Replacing the thermostat/sensor |
| Ice on the back wall, work without stopping | The door seal is broken | Checking and replacing the seal |
| Noisy operation, vibration | Improper installation or wear shock absorbers | Alignment of legs, replacement of shock absorbers |
Refrigerant leakage and compressor problems
The most serious and expensive reason is freon from the circuit. When the amount of gas in the system drops, the refrigerator loses its ability to reach the desired temperature. The compressor works hard, trying to compensate for the lack of refrigerant, but the cooling efficiency drops to zero or becomes critically low. refrigerant leak (freon) from the circuit. When the amount of gas in the system drops, the refrigerator loses its ability to reach the desired temperature. The compressor is working hard, trying to compensate for the lack of refrigerant, but the cooling efficiency drops to zero or becomes critically low.
When there is a leak, you can often notice that the condenser (grid at the back) is only partially warm or cold, although the motor is hot. Another sign may be swelling of the wall inside the chamber (at the place where the evaporator is sealed) or the appearance of oily spots under the refrigerator if the leak occurred in an accessible place.
Another option is loss of performance yourself compressor. The motor hums, the shaft rotates, but the required pressure is not created in the system due to wear of the piston group or valves. In this case, the refrigerator will also operate continuously without reaching the target temperatures.
⚠️ Attention: If you hear gurgling or hissing inside the refrigerator when it is running, this may be a sign of a freon leak. Refilling the system on your own without eliminating the cause of the leak is useless and dangerous.
☑️ Diagnostics of continuous operation
Failures in the electronic control module
In modern On models, the “brain” is the electronic control module. If it malfunctions, it can send incorrect commands to the actuators. For example, the compressor turn-on relay may “stick” in the closed state, due to which voltage is constantly supplied to the motor, regardless of sensor readings.
Often, such failures occur due to power surges in the network. Pulse interference they can damage the board elements responsible for switching. Visually, blackening, swollen capacitors or burn marks may be visible on the board, although often the defect is hidden inside the microcircuits.
Module diagnostics require special knowledge and equipment. In some cases, a complete reset (reboot) helps by unplugging the device from the network for 15–20 minutes. If the problem returns, repair or replacement of the control board is required.
Frequently asked questions and answers (FAQ)
How long can the refrigerator work without stopping after turning on?
After the first turn on or complete defrosting, the refrigerator can work continuously from 3 to 12 hours to gain the initial temperature. If it does not turn off for more than a day, this is a sign of a malfunction.
Can the refrigerator work without stopping due to the heat in the room?
Yes, high ambient temperature makes the compressor work longer. However, it should still cycle off, although the rest intervals will be very short. The complete absence of pauses even in the heat is a malfunction.
What to do if the refrigerator freezes too much and does not turn off?
Most likely, the thermostat or temperature sensor has failed. It is necessary to turn the regulator knob to the minimum position. If the shutdown does not occur, the thermostat needs to be replaced.
Is it dangerous to leave a refrigerator running without stopping?
Yes, it is dangerous. The compressor is not designed to operate 24/7 without interruption. This will lead to overheating, jamming of the motor and possible fire of the wiring. At the first sign of a malfunction, it is better to turn off the power to the device.