The situation when The refrigerator works without interruption, which is familiar to many owners of household appliances. You notice that the compressor is humming constantly, and pauses in its operation have either disappeared or become too short. This not only leads to increased energy consumption, but also creates constant background noise that interferes with rest. Moreover, continuous operation of the motor can lead to its overheating and rapid failure, which will require expensive repairs.
There are many factors that influence the operating mode of the unit. This can be either a simple user error during operation or a complex technical malfunction of the cooling system components. Understanding the principles of operation thermostat and compressor will help you quickly navigate the problem. Often the reason lies in a violation of the tightness of the circuit or incorrect operation of the electronics.
In this article we will examine in detail the main reasons why refrigerator stopped turning off. We will consider both simple actions that you can perform yourself, and complex breakdowns that require the intervention of a specialist. It is important not to ignore this symptom, as it is often a harbinger of more serious problems with the cooling system.
⚠️ Attention: If you smell something burning or see sparking in the compressor area, immediately unplug the appliance and call a professional. Operation of faulty equipment can lead to a fire.
Improper operation and external factors
Before sounding the alarm and looking for breakdowns inside the unit, it is worth analyzing the conditions of its operation. Often, users themselves create conditions under which the refrigerator is forced to work in increased mode. The first and most common reason is a violation of the temperature regime in the room. If the kitchen is too hot, it is more difficult for the system to remove heat.
Particular attention should be paid to the tightness of the door. If rubber seal the door is worn out, dirty or skewed, warm air constantly flows inside. Sensors detect the temperature increase and command the compressor to work without stopping. Check the cleanliness of the seal and the tight fit of the door around the entire perimeter.
Another important point is the location of the refrigerator. If it is placed close to the wall or next to heating devices, the air circulation around the condenser is disrupted. This leads to overheating of the system and increased engine operating time. Also, frequently opening the door or placing hot food inside causes the unit to work at its limit.
It is also worth checking whether the refrigerator is overloaded with food. If food blocks the cold air circulation channels, the temperature sensor may not read correctly. In models with No Frost this is especially critical, since the airflow to the evaporator is disrupted.
Malfunctions of the thermostat and temperature sensors
One of the key parts responsible for the cyclic operation is the thermostat (thermostat). It is he who is responsible for turning the compressor on and off depending on the temperature in the chamber. If this element fails, it can constantly send a signal that the chamber is warm, causing the motor to work continuously.
In modern models with electronic control, the role of a thermostat is performed temperature sensors. There may be several of them: in the refrigerator, in the freezer, on the evaporator. The failure of even one sensor can lead to incorrect operation of the entire system. The electronic control module receives false data and does not give a shutdown command.
⚠️ Attention: Diagnostics of electronic sensors requires the use of a multimeter. Without the appropriate knowledge and tools, it is better not to try to replace them yourself, so as not to damage the control board.
Mechanical thermostats are also susceptible to breakdowns. Inside them there is a bellows tube filled with freon, which reacts to changes in temperature. If this tube is depressurized or the contacts are stuck, adjustment becomes impossible. In such cases, a complete replacement of the unit is required.
How to check the thermostat yourself?
To check a mechanical thermostat, you can close its contacts directly. If the refrigerator started working when the contacts were closed, but stopped when opened (observing safety precautions), then the problem is in the thermostat. However, this method is only suitable for experienced users.
Symptoms of sensor failure are often accompanied by erroneous codes on the display. For example, the error code may indicate an open circuit in the sensor or a short circuit. Ignoring these signals will cause the refrigerator work to wear out, trying to reach a non-existent temperature.
Refrigerant leak and problems with the compressor
If the refrigerator freezes but does not turn off, this may indicate partial loss of refrigerant (freon). When there is a leak, the pressure in the system drops, and the compressor is forced to work longer to reach the required temperature. Ultimately, it can work around the clock, but still not achieve the desired cold.
The compressor is the heart of the refrigerator. If it is faulty, for example, there are problems with valves or windings, the efficiency of gas compression decreases. The engine hums and heats up, but does not create enough pressure for a normal cooling cycle. This leads to a constant operating mode.
The table below shows the main signs that help differentiate problems with freon and compressor:
| Symptom | Freon leakage | Compressor malfunction |
|---|---|---|
| Temperature in the chambers | Above normal, food spoils | Can be normal or elevated |
| Sound of operation | The motor is quieter than usual | Knocking, clanging, intermittent hum |
| Condenser heating | Warm only at the beginning of the grate | Uneven or too hot |
| Operating mode | Continuous, without shutdowns | Constant or with frequent clicks |
Freon leakage often occurs in places where pipes are soldered or due to corrosion of the evaporator. It is impossible to independently find the location of the leak and refill the system without special equipment. You need to call a technician with a vacuum pump and a pressure gauge station.
Problems of the defrosting system in No Frost refrigerators
In units with a system No Frost the proper operation of the automatic defrosting system is critically important. It consists of a heating element, a timer (or electronics), a defrost sensor and a drip sensor. If any of these elements fails, a coat of ice begins to grow on the evaporator.
Ice blocks the circulation of cold air. The fan moves air, but it cannot pass through the frozen evaporator. As a result, the chambers are warm, the sensors require cooling, and the compressor runs without interruption. At the same time, it may be colder in the freezer than in the refrigerator compartment.
☑️ Signs of a defrost malfunction
The defrosting heating element or the sensor that controls the temperature of the evaporator during defrosting often breaks. If the sensor is stuck in the frozen position, the defrost will never turn on. If the heating element is burnt out, the ice will not melt. In both cases, the result is the same - continuous operation of the motor. icing of the evaporator and continuous operation of the motor.
For diagnostics, you need to remove the back panel in the freezer and visually assess the condition of the evaporator. A thick layer of ice will confirm a defrosting problem. Next, the integrity of the heating element and the resistance of the sensors are checked with a multimeter.
Failures in the electronic control module
Modern refrigerators are controlled by complex electronics. The control board analyzes the readings of all sensors and makes a decision to turn on the compressor, fans and heating elements. If a module malfunctions, it may ignore signals that the set temperature has been reached.
The causes of failures can be different: power surges, moisture ingress, manufacturing defects, or simply wear and tear of components. In some cases, rebooting the system helps. To do this, refrigerator you need to completely disconnect from the network for 15-20 minutes, and then turn it on again.
If the problem persists after a reboot, there is likely a malfunction of the board itself or its firmware. In such cases, it is often necessary to flash the module or replace it. Repairing the board yourself is only possible if you have deep knowledge of radio electronics.
It is worth noting that in some models, if the sensors fail, the control module goes into emergency mode, where the compressor works constantly to prevent defrosting of food. In this case, the temperature indicator may flash on the display or an error code will be displayed.
When you need to call a technician: diagnosis of complex breakdowns
There are a number of situations when attempts at self-repair can lead to final breakdown of the unit. If you have checked the seals, room temperature and operating modes, but the refrigerator continues to work without interruption, most likely the problem is internal.
Replacing a compressor, searching for freon leaks, repairing an electronic board or replacing filter-driers sealed into the system require professional equipment and skills. The technician will conduct a full diagnostic, check the pressure in the system, the current consumption of the motor and the integrity of the electrical circuits.
Do not delay contacting service. Prolonged operation of the compressor in emergency mode leads to its burnout. The cost of replacing a motor-compressor is significantly higher than preventative repairs or replacing a thermostat. In addition, food in a refrigerator that is not working or does not freeze well may spoil.
⚠️ Attention: Opening the refrigeration circuit (pipes) without skill leads to moisture and air entering the system, which requires expensive refilling and vacuuming. Do not bite the pipes yourself!
It is also necessary to contact a specialist if you hear unusual sounds: gurgling, metallic knocking, strong vibration. These symptoms indicate mechanical damage or problems with the refrigerant that cannot be corrected by simple adjustment.
Why does the refrigerator hum, but does not turn off after defrosting?
If you defrosted the refrigerator manually, and after turning it on it works without stopping, you may have damaged the defrosting system or there is water left in the drainage system that has frozen and is blocking the sensors. The thermostat could also have moved.
Can the refrigerator not turn off due to low room temperature?
Usually, when the room temperature is low, the refrigerator should turn off more often. However, if the temperature in the room is below the minimum allowable for the refrigerator to operate (usually +10°C), the oil in the compressor may thicken, and the thermostat in the refrigerator compartment (if there is one for two chambers) may incorrectly read the temperature, forcing the freezer to work constantly.
What to do if the new refrigerator does not turn off?
In the first 24 hours after the first turn on the new refrigerator can work without interruption. This is normal, since the system needs time to cool the entire volume of chambers and products to the set temperature. If the mode does not return to normal after a day, check the settings and loading.
Influence of the "Super Freeze" mode
If you have turned on the fast freezing mode (Super Freeze), the refrigerator will work continuously until you turn it off manually or until the timer expires (usually 24-48 hours). Check if the indicator of this mode is on.