The situation when refrigerator does not turn offis familiar to many owners of household appliances, and this symptom absolutely cannot be ignored. Constant operation of the motor-compressor leads to its overheating, rapid wear of parts and a significant increase in electricity bills. In some cases, this may indicate a serious malfunction that requires immediate attention, while in other situations the problem is solved by a simple reset or defrosting.
Understanding the operating principles of your unit will help you quickly identify the cause of the failure and prevent food spoilage. Modern models with the No Frost system and Inverter compressors can operate continuously longer than usual, but even they have rest cycles. If you notice that the equipment is humming for days on end, you need to carry out an initial diagnosis.
In this article we will analyze in detail the main reasons why The refrigerator stops turning offand determine what steps you can take yourself, and when it is better to call a specialist. It is important not to panic, but to check each unit sequentially to find the root of the problem.
Checking the tightness of doors and seals
The most common and easily eliminated reason for continuous operation is a violation of the seal of the chamber. If warm air from the room constantly enters the refrigerator, temperature sensors record the increase in degree and command the compressor to work without stopping. This is the basic principle of thermoregulation, which is violated when the door does not fit tightly.
Carefully inspect rubber seal around the perimeter of the door. Over time, it may dry out, become cracked, or simply become contaminated with grease and crumbs, causing it to no longer fit tightly to the body. Even a microscopic gap leads to constant circulation of air masses and disrupts the thermostat settings.
Check whether shelves or products are preventing you from closing the door tightly. Sometimes simply rearranging the cans on the shelf is enough to eliminate the gap. Also make sure that the refrigerator itself is level and not skewed, since skew can interfere with normal slamming.
☑️ Diagnosis of the seal
There is a simple and effective way to check the tightness, known as the “paper test”. Take a regular sheet of paper, clamp it with the refrigerator door so that part of the sheet hangs out, and try to pull it out. If the paper comes out easily and without resistance in different places around the perimeter, it means that the seal does not fulfill its function and requires replacement or cleaning.
Malfunctions of the thermostat and temperature sensors
The thermostat (or thermostat) is the “brain” of the cooling system, which is responsible for turning the compressor on and off depending on the temperature inside the chambers. If this device fails, it can transmit incorrect signals, causing the motor to run endlessly, even when food is already frozen.
In older refrigerator models, mechanical thermostats often break due to wear on the internal contacts or loss of sensitivity of the bellows. More modern units, such as Bosch or LG, use electronic sensors (thermistors) that transmit data to the control module. Failure of any of these elements leads to the fact that the refrigerator does not turn off..
⚠️ Attention: If you hear a characteristic click when turning the thermostat knob, but the compressor does not respond, or vice versa - there is no click at all, this is a direct sign of a malfunction of the regulator.
To diagnose a mechanical thermostat, you can try gently knocking on its body or slightly turning the adjustment knob. If after these steps the motor starts or stops, then the problem lies precisely in sticking contacts. In the case of electronics, you will need a multimeter to check the resistance of the sensors.
How to check a thermostat with a multimeter
To check, you need to remove the thermostat, set the multimeter to the continuity mode and short the probes to the contacts. When the sensor is cooled (for example, in a freezer), the circuit should open or close depending on the type. If the resistance does not change, the part is faulty.
Replacing the thermostat is a DIY procedure that can be done if you have basic tool skills. However, it is important to choose a similar model with the same temperature parameters, otherwise the operating mode of the refrigerator will be disrupted.
Problems with the compressor and start relay
The compressor is the heart of the refrigeration unit, and it is it that creates the pressure necessary for the circulation of the refrigerant. If the compressor works without interruption, this may indicate a loss in its performance or problems with startup. The engine may hum, trying to gain the required pressure, but due to wear of the piston group or valves, it cannot cope with the task.
A frequent reason for continuous operation is a malfunction of the starting relay. This small element is responsible for starting the compressor engine. If the relay contacts are burnt or the mechanism is stuck, the compressor may either not start at all or operate in emergency mode without receiving a signal to stop.
| Symptom | Probable cause | Solution |
|---|---|---|
| Humming and clicking, but no cold | Malfunction of the start relay | Replacement of the relay |
| The compressor is hot, runs constantly | Compressor wear or freon leak | Pressure diagnostics, repair |
| The refrigerator turned off and will not turn on | The compressor or thermostat burned out | Replacement of parts |
| Strong vibration and noise | Destruction of the compressor pads | Replacing shock absorbers |
Pay attention to the temperature of the compressor housing. If it is heated to such an extent that it is impossible to touch it, this is an alarming signal. Overheating of the windings can lead to an interturn short circuit and complete failure of the unit. In such cases, the operation of the equipment must be stopped immediately.
Refrigerant leak and clogged capillary tube
One of the most difficult problems to fix on your own is a freon (refrigerant) leak or a clogged capillary system. If there is a leak in the circuit, the amount of refrigerant decreases and the pressure drops. The compressor is forced to work in increased mode, trying to compensate for the lack of substance and reach the set temperature, but physically cannot do this.
Cloggery of the capillary tube often occurs due to moisture entering the system or the formation of paraffin plugs. This creates an obstacle to the circulation of freon, which also leads to continuous operation of the motor. In both cases, you may notice that the refrigerator does not freeze well or does not freeze at all, despite the constant hum.
⚠️ Attention: It is impossible and dangerous to independently look for a leak or try to clean the capillary tube without special equipment (vacuum pump, pressure gauges, burner). These works require qualifications and a license to work with refrigerants.
Indirect signs of a leak or blockage may include swelling on the walls of the refrigerator (where the tube is sealed) or the presence of oily stains (oily traces) on the rear grille or at the bottom of the unit. Freon circulates along with oil, so where the gas leaves, lubricant often remains.
The influence of No Frost mode and inverter technologies
Owners of modern models should know that continuous operation is not always a breakdown. Refrigerators with system No Frost and inverter compressors operate according to a different algorithm than the old linear models. They may not turn off completely, but only reduce the speed to a minimum, maintaining a stable temperature.
An inverter motor, unlike a conventional one, does not have rigid “on-off” cycles. It smoothly regulates its power. Therefore, a quiet, almost imperceptible hum in the background is a normal state for such units, for example, models Samsung Digital Inverter or LG Linear Compressor.
However, if you hear the characteristic sound of a compressor operating at full power, which does not subside for hours, and at the same time ice forms on the walls of the chamber or products begin to deteriorate, then the control system is not working correctly. In No Frost mode, a working defrost timer and evaporator heating element are also important.
External factors and incorrect operation
Before sounding the alarm and looking for breakdowns inside, analyze the operating conditions. Often the reason lies in simple overheating. If the refrigerator is placed close to a wall, next to a radiator, or in direct sunlight, it cannot transfer heat effectively. The motor will work without interruption, trying to cool the chambers when the condenser is overheated.
The supply of hot products to the chamber is another factor that makes the equipment work for wear. The law of physics states that in order to cool a pot of hot soup, the compressor will have to spend a huge amount of energy and time. During this period, the refrigerator may not turn off for several hours.
- 🔥 Location: Check whether there is a gap of at least 10 cm between the back wall of the refrigerator and the kitchen wall for ventilation.
- 🍲 Loading: Never put hot food inside, let the dishes cool to room temperature.
- 🌡️ Temperature in the room: In hot weather (+30°C and above), it is more difficult for the refrigerator to work, it may turn on more often than usual.
- 🧊 Load volume: An empty refrigerator loses cold faster, and an overly stuffed one prevents air circulation. Follow the golden mean.
It is also worth mentioning the seasonal factor. In summer, when the ambient temperature in the room is high, the compressor operating time naturally increases. If in winter, in a cool room, the refrigerator hums without interruption, this is a clear sign of a malfunction.
Frequent questions and answers (FAQ)
How long should a refrigerator operate normally?
Under normal conditions, the operating cycle is approximately 15-20 minutes of work and 30-40 minutes of rest. The working time ratio is usually around 30-40%. If the refrigerator works for 2 hours and rests for 10 minutes, this is a cause for concern.
Is it possible to use the refrigerator if it does not turn off?
For a short time - it is possible to save food. But long-term operation in this mode will lead to burnout of the compressor windings and costly repairs. It is better to temporarily transfer the food to a cool place or use the “Super Freeze” mode (if it is available) only for a short time.
Why does a new refrigerator constantly work?
When turned on for the first time, a new refrigerator takes time (up to 24 hours) to reach operating temperature and stabilize the cycles. During this period, it can work non-stop. If the situation has not changed after a day, contact the service.
Is it dangerous if the compressor is very hot?
The normal temperature of a working compressor can reach 70-90 degrees Celsius (the hand is hot, but tolerable). If it is hot to the point where you cannot touch it, or you smell a burning smell, immediately disconnect the device from the network.
Can incorrect voltage in the network cause continuous operation?
Yes, low voltage in the network can lead to the fact that the starting relay does not work correctly, or the compressor cannot develop the required power while operating idle. It is recommended to use a voltage stabilizer if you have power surges.