The situation when the refrigerator runs non-stopis familiar to many owners of household appliances. The hum of the compressor, which does not subside day or night, not only irritates the ears, but also makes you worry about the safety of your food and your electricity bill. Normally, the unit should turn on and off with a certain frequency, maintaining a given temperature regime inside the chambers.
Continuous operation of the motor indicates that the cooling system cannot reach the target temperatures, or the sensors are faulty and do not signal a shutdown. This can be caused by either a simple overload of products or a serious refrigerant leak. Inverter compressors, for example, they can operate continuously in extreme heat, but at low speeds, which is the norm, unlike older models.
In this article we will look at why your The refrigerator does not turn offwhich nodes require checking first and when you need to call a technician. Understanding the principles of operation will help you distinguish a normal situation from a breakdown that requires immediate intervention.
The influence of external factors and operating conditions
Before you panic and look for faults in the “insides” of the unit, it is worth assessing the conditions in which it is located. Often the reason lies in the environment. If the room is too hot, heat transfer difficult, and the compressor is forced to work longer to compensate for the heat gain. In the summer or when placing equipment next to a stove or radiator, this is especially noticeable.
Another important factor is tightness. If you have just loaded a large amount of warm food or open the door frequently, warm, moist air will enter. The system tries to cool this volume, which is why operation cycle extends. It is also worth checking whether the thermostat has stuck to the wall of the chamber, which distorts its readings.
⚠️ Attention: If the temperature in the room where the refrigerator is located exceeds +32°C, continuous operation of the compressor can be considered acceptable, but extremely undesirable for the equipment’s life.
Make sure there are gaps around the case for ventilation. The rear grille should not touch the wall closer than 5-7 cm. Dust on the condenser also reduces the efficiency of heat transfer, forcing the motor to work harder.
⚠️ Attention: Operating conditions may vary depending on the model and climate class of the equipment. Check the device data sheet to clarify the permissible temperature ranges.
Problems with sealing rubber bands and doors
One of the most common reasons why the refrigerator hums and does not turn offis a violation of the seal of the chamber. Sealing rubber bands (cuffs) dry out, crack or become deformed over time. Through the resulting cracks, warm air constantly penetrates inside, and the temperature sensor “thinks” that the chamber is warm, not allowing the compressor to rest.
You can check the tightness with a simple test with a sheet of paper. Press the door around the perimeter of the sheet and try to pull it out. If the paper is removed easily and without resistance, the seal does not fit in this place. Also carefully inspect the rubber for tears or sticky deposits that prevent it from sealing tightly.
- 🔍 Inspect the seal around the entire perimeter for cracks and creases.
- 🧼 Wipe the rubber with soapy water to remove grease and stickiness that interfere with the seal.
- 🔥 If the rubber is deformed, try gently warming it with a hairdryer (without overheating) or boiling water to restore elasticity.
- 🚪 Check the door hinges: if they are skewed, even a whole rubber will not ensure tightness.
If the mechanical damage is serious, the only way out is will become Replacing the seal. The new cuff will ensure proper fit of the door and restore normal operation of the compressor.
Thermostat faults and temperature sensors
The thermostat (thermostat) is the “brain” that decides when to turn the motor on or off. If this element fails, the contacts may become stuck in the on position and the refrigerator will run indefinitely, turning the compartment into a freezer. In modern models with electronic control sensors (thermistors) are responsible for this, which can give incorrect readings due to oxidation or an open circuit.
Diagnostics of a mechanical thermostat often requires removing it and “testing” it with a multimeter at different temperatures. If the contacts do not open even in extreme cold, the part must be replaced. Electronic systems often require diagnostics of the control module, which may incorrectly interpret signals from sensors.
| Control type | Failure symptom | Probable cause | Solution |
|---|---|---|---|
| Mechanical | Works non-stop, heavy ice | Sticking thermostat contacts | Replacing the thermostat |
| Electronic | Error on the display, permanent hum | Faulty sensor (thermistor) | Replacement of sensor or wiring |
| Inverter | Motor does not slow down | Failure of control board or sensor | Electronics diagnostics |
It is important to note that in models with No Frost sensors can be located at different points of the evaporator. Incorrect readings of one of them can block the transition to standby mode.
How to check a thermostat with a multimeter?
To check a mechanical thermostat, remove it and immerse the sensitive tube in cold water with ice. Ring the contacts: in the cold the circuit should open (resistance is infinity), in the heat it should close (resistance is close to zero). If the chain does not break in the cold, the thermostat is faulty.
Refrigerant leakage and problems with the compressor
If the refrigerator is working, making noise, but does not give cold (or gives very little), and does not turn off, there is a high probability of a freon leak. Refrigerant circulates through system, taking away heat. When its quantity drops below a critical level, the pressure in the system drops, and the compressor tries to compensate for the lack of cold by continuous operation.
The compressor in this situation works “to wear out,” which can lead to overheating and combustion. Sometimes you can hear a characteristic gurgling sound or see oily spots on the pipes at the back of the unit. It is difficult to fix a leak on your own: you need to find the location of the damage, solder it, evacuate the system and refill with freon.
- ❄️ Check the evaporator (inside the chamber or behind the rear panel) for swelling or corrosion.
- 🔊 Listen: if the sound of operation has become louder or there are metallic knocks, the compressor may be faulty.
- 🌡️ Feel the condenser (grid at the back): normally it should be warm evenly. Cold areas may indicate a blockage or leak.
In some cases, the problem lies in the compressor itself: worn valves do not allow the necessary pressure to be created, and the equipment runs idle.
⚠️ Attention: Freon is a gas that requires professional handling. Do not try to open the circuit yourself or add refrigerant without evacuating the system.
Clogged capillary tube and defrost system
Another technical reason for continuous operation is clogged capillary tube. This is a thin line through which freon enters the evaporator. If there is moisture in the system, it may freeze and form an ice plug, or the tube may become clogged with oil oxidation products. The circulation of the refrigerant is disrupted and the cold does not enter the chamber.
It is also worth paying attention to the defrosting system in No Frost models. If the defrost heating element, timer or defrost sensor is faulty, the evaporator becomes covered with a “coat” of ice. The air stops circulating, the temperature sensor in the chamber does not detect cooling, and the compressor runs without interruption. Visually, this can manifest itself in the form of ice on the back wall inside the refrigerator.
To eliminate the blockage, the system must be purged with nitrogen under pressure and the filter-drier replaced. Repairing a defrost system usually involves replacing a burnt-out heating element or a faulty sensor.
☑️ Primary diagnostics during continuous operation
"Super Freeze" mode and other settings
Do not forget about the human factor. Many refrigerators have a Super Freeze or Quick Cool function. In this mode compressor it is forcibly not turned off for a certain time (usually several hours or days) in order to quickly freeze a large amount of food. If you accidentally activate this function, the refrigerator will work continuously until the timer turns off the mode or you do it manually.
Check the control panel: is the snowflake indicator or the corresponding inscription on? Also make sure that the temperature setting is not turned to minimum. Setting the temperature too low in a hot room will force the appliance to work at its limit.
Carefully read the instructions for your model Indesit, Bosch, LG or any other. The sequence of buttons to disable the boost mode may vary. Usually it is enough to press the mode button again or hold it for 3-5 seconds.
Can the refrigerator not turn off due to a broken control board?
Yes, this is possible. If the “brain” of the refrigerator - the control module - fails, it can send a continuous signal to start the compressor, ignoring the readings of the temperature sensors. This is often accompanied by chaotic behavior of the indicators on the panel.
Why does a new refrigerator work constantly on the first day?
When turned on for the first time, an empty refrigerator must gain temperature from zero. This takes time, especially if the room is hot. It is normal if it does not turn off in the first 6-12 hours. If after setting the temperature the cycle does not return to normal, this is a cause for concern.
Does the amount of products affect the operating time?
Yes, it does. A full refrigerator holds the cold better, but also takes longer to cool down. However, if you load a lot of warm food at once, the compressor will work for a long time to cool the entire volume. Try not to put hot things inside.
What to do if the refrigerator freezes too much and does not turn off?
This is a classic sign of a malfunctioning thermostat or temperature sensor. The system “does not see” that the cold has already been reached. It is necessary to disconnect the device from the network and call a technician to replace the sensor or thermostat so that the food does not deteriorate from hypothermia.