The situation when the refrigerator compressor works without interruption can arise suddenly and take you by surprise. You may notice that the unit hums for hours, and pauses in its operation have completely disappeared. This is a sure sign that the cooling system has stopped receiving a signal that the required temperature inside the chambers has been reached.
Such a malfunction is dangerous not only due to constant noise, but also the risk of food spoilage, as well as the possible failure of an expensive motor-compressor. Owners often wonder why the equipment does not go into standby mode and are looking for simple answers. However, ignoring the problem can lead to serious financial costs for repairs.
In this article we will look in detail at the mechanical and electronic causes of failures. We will look at how to independently diagnose a breakdown and when to call a specialist. Understanding the operating principles of your model will help you react quickly and save food supplies.
Damage to the sealing rubber and cold leakage
One of the most common reasons for the continuous operation of the compressor is a violation of the seal of the chamber. If sealing rubber the door is worn out, cracked or dirty, warm air from the room constantly penetrates inside. The temperature sensor detects an increase in temperature and sends a command to start the motor, which cannot cool the volume with an open circuit.
Carefully inspect the rubber circuit around the perimeter of the door. There should be no tears, creases or sticky residue that would interfere with a tight fit. Sometimes the rubber simply moves away from the body in the corners, forming a gap through which the cold escapes. In such cases, the equipment works to the limit of its capabilities.
If the seal is simply dirty, it is enough to wash it with warm water and a mild detergent. However, in case of mechanical damage, a full replacing the partwill be required. Checking the tightness can be done with a simple test with a sheet of paper, holding it between the door and the body at different points.
⚠️ Attention: Do not use aggressive chemicals or abrasive sponges to clean the seal, as this will accelerate the destruction of the rubber and lead to loss of elasticity.
A poorly closing door is a classic operating error that is often forgotten. Children may not close the chamber completely, or the refrigerator may be overloaded with products that prevent it from closing tightly.
Thermostat or sensor is faulty temperature
In modern models, an electronic thermostat is responsible for temperature control, and in older models, a mechanical thermostat is responsible. If this element fails, it may send incorrect data to the control module. For example, a signal that the chamber is warm is constantly received, even if the food is already frozen. temperature sensor, and in older ones - a mechanical thermostat. If this element fails, it may send incorrect data to the control module. For example, a signal that the chamber is warm is constantly received, even if the food is already frozen.
Mechanical thermostats often suffer from contact oxidation or calibration failure. As a result, the circuit does not open and the compressor continues to pump refrigerant. Electronic sensors can fail due to power surges or manufacturing defects. In both cases, the system “thinks” that the task has not yet been completed.
To diagnose a mechanical regulator, sometimes it is enough to knock on its handle or turn it slightly in different directions. If the motor stops after this, then the problem is stuck contacts. However, this is a temporary solution, and it is better to replace the part.
Replacing the thermostat is a procedure that can be done with your own hands if you have basic tools. The main thing is to choose an analogue with identical characteristics so that temperature conditions meets the requirements of the manufacturer of your model.
Loss of system tightness and leakage of freon
The most serious technical problem is leakage refrigerant (freon) from the cooling circuit. This may occur due to corrosion of the evaporator tubes, mechanical damage during transportation, or poor-quality factory soldering. When there is little gas in the system, the refrigerator loses its ability to gain and retain cold.
The compressor in this situation works continuously, trying to compensate for the lack of refrigerant. You may notice that the back wall inside the chamber is no longer covered with frost, or, conversely, the freezer is working, but the refrigerator compartment is not. In this case, the engine can become very hot.
It is difficult to diagnose a leak on your own, since freon is colorless and odorless. The technician uses special leak detectors or a method of painting the system. Repair requires evacuation of the circuit, elimination of the leak and refilling with a new portion of gas.
⚠️ Attention: It is strictly forbidden to open the cooling system yourself or try to refuel the refrigerator without special equipment - this is dangerous to life and health.
Often the leak is accompanied by swelling of the evaporator inside the housing. If you see characteristic swelling on the back wall inside the freezer, this is a sure sign of depressurization. In such cases, complex repairs are required with the replacement of the foamed evaporator.
Problems with the control module and electronics
In refrigerators with a system No Frost and electronic control, the main module is responsible for all processes. If elements on the board burn out or a firmware failure occurs, the command to turn off the compressor may simply not be received. Electronics continue to “see” the need for cooling.
Sometimes the problem lies in oxidation of contacts or damage to the wiring going to the sensors. Power surges in the network can lead to failure of the relay that controls the start of the motor. In this case, the relay remains in the closed state.
Diagnostics of electronics requires the use of a multimeter and knowledge in radio engineering. Often a visual inspection of the board shows burn marks or swollen capacitors. Repairing a module or replacing it is a task for a qualified specialist.
Is it possible to reset electronics errors yourself?
In some models, a complete reset or disconnecting the device from the network for 15-20 minutes helps. However, if a breakdown has already occurred, a soft reset will not help and parts will need to be replaced.
It is also worth checking the integrity of the wires going from the door to the body. If they are opened frequently, they can fray, which will lead to a short circuit or open circuit of the control circuit.
The influence of external factors and operating conditions
The reason does not always lie within the unit itself. External conditions play a huge role. If the refrigerator is placed next to a hot radiator, in direct sunlight or in a niche without ventilation, heat exchange is disrupted. The motor is forced to run longer to remove heat through the condenser.
Loading hot food is another common mistake. By placing a pot of soup in the chamber, you artificially increase the temperature inside. Sensors react to this and turn on the compressor for a long time. This is normal for a short-term period, but harmful if repeated regularly.
It is also important to consider the temperature in the room. If the room is too cold (below +10°C) or too hot (above +32°C), the appliance may not work correctly. In winter, in an unheated room, the oil in the compressor thickens, making it difficult to start and operate.
Check whether the ventilation holes on the rear panel are not blocked by dust or animal hair. A clogged condenser cannot effectively transfer heat, which forces the system to work in increased mode.
Diagnostics and table of symptoms of malfunctions
To accurately determine the cause of continuous operation, it is necessary to conduct a comprehensive diagnosis. Below is a table that will help compare symptoms with possible breakdowns. This will help you roughly understand the scale of the problem before calling a technician.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor is hot, humming, there is no cold | Freon leak or capillary blockage | High (requires a technician) |
| The motor works, but does not turn off, there is cold | Thermostat or sensor is faulty | Medium (you can replace it yourself) |
| The sound of the motor running is heard, but quieter than usual | Problems with the starting relay or windings | Medium |
| The refrigerator turns on immediately after switching off | The door seal is broken | Low (adjustment or replacement) |
When diagnosing, always start with the simplest steps: checking the tightness of the door closure and cleaning the condenser from dust. Often it is these simple measures that allow you to restore the normal operating cycle without calling service.
If simple methods do not help, you should not disassemble the compressor unit yourself. This is a complex device that requires special tools for hermetically sealed assembly.
☑️ Primary diagnostics
Prevention and operating rules
It is important to follow how to avoid situations when the refrigerator does not turn off operating rules. Defrost your appliances regularly unless they have an automatic defrost system. Keep the internal chambers clean and promptly remove expired products.
Do not set the temperature regulator to the maximum value unless necessary. The mode Super Freeze or maximum cold is intended for quick freezing, and not for constant operation. Long-term use of such modes wears out the compressor.
Periodically check the condition of the seal and clean the ventilation holes. Proper installation of the refrigerator away from heat sources will extend its service life. Following these simple recommendations will allow the equipment to work for years without failure.
⚠️ Attention: Do not place the refrigerator near a gas stove or oven, as excess heat negatively affects the operation of the cooling system and energy consumption.
Frequently asked questions (FAQ)
How long should the refrigerator operate normally?
In normal operation, the refrigerator turns on periodically. Typically the operating cycle is about 10-15 minutes, followed by a pause of 20-30 minutes. The working time ratio is approximately 30-40%. If the motor hums for several hours in a row, this is a sign of a malfunction.
Is it possible to use the refrigerator if it does not turn off?
For a short time, it is possible, but this is emergency mode. Long-term operation without stopping will lead to overheating of the compressor windings, melting of the insulation and eventual combustion of the motor. In addition, food in the refrigerator compartment can freeze, and in the freezer it can become covered with a thick layer of ice.
Why does the refrigerator not turn off for a long time after defrosting?
Immediately after defrosting, the temperature inside the chambers is high. The compressor takes time (sometimes several hours) to cool the volume to the specified parameters. If after 3-4 hours of work without a break the cold still does not appear, or the motor does not stop, then there is a problem.
Does the amount of food affect the operating time?
Yes, it does. A fully loaded refrigerator stays cold longer, but it also takes longer to initially cool a large volume of food. An empty refrigerator gains temperature faster when the door is opened. The optimal load is about 70% of the volume.