You noticed that your refrigerator buzzes continuously, ignoring the usual rest cycles? This is the first alarm signal indicating that the cooling system has entered emergency operation mode. In normal mode, the unit should turn on and off several times an hour, maintaining a given temperature balance inside the chambers.
The constant operation of the motor-compressor leads to critical overheating nodes and a significant increase in electricity bills. Ignoring the problem can lead to complete failure of expensive equipment, after which complex and costly repairs will be required. Understanding the causes of a malfunction is the first step to saving equipment.
In this article we will analyze in detail the mechanics of the process, consider typical user errors and technical breakdowns. You will learn how to independently carry out initial diagnostics and in which cases it is better to immediately call a specialist.
Normal operation of refrigeration equipment
To understand the problem, you need to clearly understand how a working unit functions. Compressor is the heart of the system, which pumps refrigerant through the tubes, creating cold. Normally, it works in intervals: it turns on, cools the chambers to the set temperature, turns off.
The duration of the operating cycle depends on many factors: the volume of the chambers, the number of products, the temperature in the room and the thermostat settings. Typically, the ratio of work and rest time is approximately 1 to 2 or 1 to 3. That is, after working for 15-20 minutes, the motor should rest for about 40 minutes.
If you notice that motor it works almost without interruptions, and pauses are only a couple of minutes or absent at all, this is a deviation from the norm. Modern inverter models can work longer, but they change power, and do not just hum at maximum.
External factors and operating errors
Before you panic and look for a service center number, you should exclude trivial reasons. Often malfunction it lies not in the breakdown of parts, but in incorrect operating conditions or actions of the user himself.
One of the most common reasons is a loose door fit. If seal the door is dirty, damaged, or simply not fully closed, warm air from the room constantly flows inside. Sensors detect an increase in temperature and command the compressor to work without stopping.
⚠️ Attention: If the door is skewed or the magnetic tape has lost its properties, the cold will escape even when the door is closed. Check the tightness of the fit with a sheet of paper - it should be clamped with force along the entire perimeter.
It is also worth checking whether the refrigerator is not loaded with warm food. If you put a pot of hot soup or freshly defrosted bags inside, the equipment will take a long time to return the climate to normal. During this period compressor will work in enhanced mode.
☑️ Primary diagnostics
Problems with the thermostat and sensors
Responsible for maintaining the set temperature thermostat (thermostat). This device measures the temperature inside the chamber and opens the electrical circuit when the target is reached. If this unit fails, it may “stick” in the “on” position.
In such cases, the refrigerator simply “does not know” that the cold has already accumulated and continues to freeze. In models with a system No Frost an electronic control module and air sensors are often responsible for this process. Their readings may be distorted due to oxidation of the contacts or failure of the sensor itself.
A symptom of thermostat failure is often not only continuous operation, but also excessive cooling of products, even to the point of freezing in the refrigerator compartment. If you turn the regulator knob, but the hum of the motor does not change, most likely the problem is in this unit.
How to check the thermostat yourself?
Unplug the refrigerator, remove the thermostat knob and get to the device itself. Test its contacts with a multimeter. When warm, the contacts must be closed. If you put the thermostat in cold water with ice, the circuit should open. If this does not happen, the part requires replacement.
Refrigerant leak and problems with the compressor
A more serious reason for continuous operation is freon leak. The refrigerant circulates in a closed circuit, picking up heat. If a microcrack appears in the system, the gas escapes and the cooling efficiency drops to zero.
Sensors detect that the temperature is not decreasing and force the compressor to work harder, trying to compensate for the lack of cold. As a result, the engine hums for days, but it’s warm inside. This condition is extremely dangerous for the engine, as it can burn out from overheating.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The engine is hot, there is cold | Wear compressor | Replacing the unit |
| The engine is cold, there is no cold | Freon leakage | Searching for leaks, refueling |
| The engine is humming, but not starts | Start relay | Replacing the relay |
| The refrigerator freezes too much | Thermostat is faulty | Replacing the thermostat |
Another problem - clogging of the capillary tube. An ice or mud plug may form in the circulation system. Freon cannot pass further, circulation stops, and efficiency drops. At the same time, the compressor continues to hum, trying to push gas.
The influence of the No Frost system and defrosting
In refrigerators with the system No Frost another element of complexity is added - the evaporator hidden behind the plastic panel. There is also a defrosting heating element, which is periodically turned on to defrost the ice.
If the defrosting system is faulty (the heating element, timer or defrost sensor is burned out), a huge lump of ice grows on the evaporator. This ice blocks the channels through which cold air should enter the chambers. The fan moves air, but there is no cold, and the compressor does not turn off.
Often users confuse such a breakdown with a compressor failure. However, in this case, the motor itself may be working fine, it just cannot perform its task due to the air flow being blocked by ice.
Diagnostics and solutions
What to do if the refrigerator does not turn off? The algorithm of actions must be consistent. First, exclude external factors: check the tightness of the doors, the absence of warm products and the correct installation (distance to the walls).
Then try to completely defrost the unit. Unplug it from the network for at least a day (preferably two). This will help if the problem was an ice jam or an electronic failure. If after switching on the problem returns after a few hours or days, repair is required.
⚠️ Attention: Do not try to open the sealed circuit yourself or change the compressor without skills and tools. Working with refrigerants requires a license and special equipment.
For accurate diagnostics, the master uses pressure gauge station to check freon pressure and a thermal imager to search for leaks or blockages. You can independently check only the mains voltage and the integrity of the power cord.
When you need to call a specialist
There are a number of symptoms in which self-repair is not only useless, but also dangerous. If you hear extraneous knocks, creaks, or see oil under the refrigerator, stop using it immediately.
A technician is also needed if, after defrosting, the refrigerator worked for a couple of hours and stopped turning off again. This is a sure sign of a technical malfunction: leakage, blockage or electronic failure. Delay will lead to the compressor burning out, which is the most expensive type of repair.
Regular maintenance and timely cleaning of the condenser at the back of the refrigerator will help extend the life of the equipment. Dust on the radiator grille impairs heat transfer, causing the motor to work longer and more intensely.
Why does a new refrigerator constantly work?
New models, especially with inverter compressors, can work longer than older counterparts, but are quieter. Also, after the first boot or defrost, it may not turn off for up to 24 hours, gaining temperature. If the cold does not appear after a day, it’s a defect.
Is it dangerous if the refrigerator does not turn off?
Yes, it is dangerous. The compressor is not designed to operate 24/7 without stopping. It will quickly overheat, which can lead to melted wiring, oil fire, or complete jamming of the motor. Electricity bills also increase.
Can hot weather affect operation?
Yes, if the room is above +30°C, the refrigerator will work almost without interruption, since heat transfer is difficult. In such conditions, try not to open the door often and check the ventilation around the body.