The situation when the refrigerator does not turn offis familiar to many owners of household appliances. Instead of the usual hum, followed by silence, the unit continues to hum monotonously for hours, trying to reach the set temperature. This is not just an annoying noise that disturbs sleep, but also an alarming signal that the cooling system is operating in emergency mode.
The constant operation of the motor-compressor leads to a colossal waste of electricity and accelerated wear of parts. If you do not understand it in time why the refrigerator works without stopping, you may face expensive repairs or complete replacement of the unit. In this article, we will look at the main mechanical and electrical faults, as well as simple operating errors that can be easily fixed on your own.
Modern models with a system No Frost or inverter compressors can work longer than older analogues, but even they must stop periodically. If your device hums for days, and the food inside begins to deteriorate or, conversely, freeze into ice, it is necessary to urgently carry out diagnostics. The critical indicator is the temperature in the refrigerator compartment: if it is above +7°C at the maximum setting of the thermostat, the problem is of a technical nature.
External factors and operating errors
Before grabbing tools or looking for a service center number, you should rule out trivial reasons. Often The refrigerator does not turn off due to conditions created by the users themselves. Checking these points will only take a few minutes, but can save you significant money.
The first thing you need to pay attention to is the room temperature. If the refrigerator is located next to a radiator, stove, or in direct sunlight, heat exchange is disrupted. The compressor tries to compensate for external heating, working for wear. Also make sure that there is a gap of at least 5-7 cm between the rear radiator grille and the wall for free air circulation.
The second important point is the tightness of the circuit. If you often open the door, leave it ajar, or get a piece of food in the rubber seal, warm, moist air enters. Sensors detect the increase in temperature and command the motor to work without interruption. Check the integrity of the magnetic tape around the perimeter of the door.
⚠️ Attention: If you have just defrosted the refrigerator or loaded it with a large amount of warm food, long-term operation (up to 12 hours) is normal. The unit needs time to reach the operating mode.
The third factor is incorrect temperature setting. In the summer, when the apartment is hot, setting the thermostat to maximum causes the system to work with virtually no rest. It is recommended to set average values corresponding to the season.
Malfunctions of the thermostat and sensors
One of the most common reasons why the refrigerator does not turn offis the failure of the thermostat (thermostat). This small device is responsible for turning the compressor on and off depending on the temperature inside the chamber. If its contacts “stick” in the “on” position, the motor will work continuously.
Modern electronically controlled models use air sensors instead of a mechanical thermostat. They can transmit incorrect data to the control module if their contacts are faulty or oxidized. In this case, the “brain” of the refrigerator “thinks” that it is warm inside and does not give the command to stop.
Diagnostics of a mechanical thermostat is often possible at home. To do this, you need to remove the regulator, disconnect the capillary tube (carefully without damaging it) and check the contacts with a tester. When the tube cools (you can put it in cold water), the contacts should open. If this does not happen, the part requires replacement.
- 🔧 Symptoms of failure: the compressor hums constantly, the temperature in the chamber is below normal (food freezes), there is no click when turning the regulator knob.
- 🔧 Difficulty of repair: medium, requires partial disassembly and the presence of a multimeter.
- 🔧 Risk: If you replace it carelessly, you can damage the refrigerant circulation system.
How to check the thermostat without removing it?
There is an express method: if when turning the thermostat knob to the “Off” position or to the minimum temperature, the compressor does not stop, the problem is most likely in the thermostat itself or the control module. However, for an accurate diagnosis, removal is still necessary.
Freon leak and problems with the compressor
If the refrigerator works, but does not cool (or it cools very weakly) and does not turn off, most likely there is a refrigerant (freon) leak. The pressure in the system drops, and the compressor tries to compensate for the lack of cooling capacity by operating in constant mode. This is one of the most serious malfunctions.
The compressor in this situation overheats, which can lead to it jamming. It is difficult to determine a leak visually, since freon is a colorless and odorless gas. Often a problem is signaled by swelling of the evaporator walls or the appearance of oily spots where the tubes are damaged.
The problem may also lie in the compressor itself. If compression is impaired (piston group wear), it will not be able to create the necessary pressure in the system. The motor hums and vibrates, but does not pump freon with the required efficiency. In this case, replacement of the unit is required.
| Symptom | Freon leakage | Compressor malfunction |
|---|---|---|
| Temperature in the chambers | High (products deteriorate) | High or uneven |
| Operation sound | Monotonous hum | Hum with metallic knocking or vibration |
| Motor heating | Severe overheating | Critical overheating, can knock out the machine |
| Visible marks | Oil stains, swelling | Often there are no external signs |
For To eliminate a leak, you need to find the location of the damage, solder it and refill the system with freon. This work should only be performed by a master with the appropriate equipment and license.
Clogged capillary tube and moisture removal system
Another technical reason why The refrigerator does not turn off is a clog in the capillary tube. An ice plug may form in the refrigerant circulation system or debris (oil oxidation products, dust) may enter. This prevents the normal flow of freon.
The compressor starts working “in vacuum”, trying to push the refrigerant through the blockage. The pressure in the system is disrupted, the cooling efficiency drops to zero, although the motor consumes full current. A characteristic sign is that the condenser (grid at the back) may be only partially cold or warm.
Often the blockage is accompanied by freezing of the evaporator in one place or, conversely, a complete absence of frost. Cleaning the system requires special equipment, evacuation and refilling. It is almost impossible to eliminate a deep blockage on your own.
☑️ Diagnosis of a blockage
⚠️ Attention: Attempts to break through the blockage by increasing pressure or tapping on the pipes can lead to rupture of the system and complete failure of the refrigerator. Do not use an open flame to heat the tubes!
Problems with the control module and electronics
In modern models of brands LG, Samsung, Bosch, Indesit and others, the electronic control module is responsible for the operation of all components. If the compressor control triac on the board burns out or there are failures in the firmware, the relay may “stick” in the on state.
In this case, the refrigerator receives a constant signal to cool, ignoring the readings of the temperature sensors. Electronics are sensitive parts and suffer from power surges. Sometimes the problem is solved by rebooting (disconnecting from the network for 15-20 minutes), but more often the board needs to be repaired or replaced.
Module diagnostics require knowledge in electronics. Visually, traces of burning, swollen capacitors, or blackened tracks may be visible on the board. If you do not have the skills of soldering and reading circuits, it is better to contact the service.
- 💡 Power surges: a common cause of failure of electronics, use a stabilizer.
- 💡 Moisture: water getting on the control board causes a short circuit and chaotic operation of the components.
- 💡 Software failures: in rare cases, resetting the settings to factory settings through the menu helps.
Specifics of operation of dual-compressor and No Frost systems
Owners of equipment with the system No Frost often get scared when they hear the fans or compressor operating longer than usual. These refrigerators have defrost cycles that can last up to 30-40 minutes, during which the compressor rests but the fans can run. However, if the motor hums for hours, this is already a pathology.
In two-compressor models (separate motor for the freezer and refrigerator), the situation is simpler: if one compressor does not turn off, then the problem is localized precisely in the circuit for which it is responsible. This narrows down the scope of troubleshooting.
It is important to understand the difference between “long-term operation” and “continuous operation”. Modern inverter compressors can run for a long time at low speeds, maintaining the temperature, and this is normal. But they should not work at full power without stopping.
FAQ: Frequently asked questions
Is it possible to leave the refrigerator on if it does not turn off until the technician arrives?
Long-term operation in emergency mode is dangerous. If you see that the compressor is hot (not just warm, but hot), it is better to unplug the device from the outlet to avoid a fire or permanent breakdown of the motor. If the temperature in the chambers is normal and it hums quietly, you can wait for the technician, but keep an eye on the situation.
Why does the new refrigerator not turn off for a long time after the first turn on?
When first started, the refrigerator takes time (from 2 to 12 hours) to cool the entire internal volume and enter operating mode. During this time, it can work non-stop. This is a normal situation that does not require intervention.
Does the amount of food in the refrigerator affect its operating time?
Yes, it does. A fully loaded refrigerator takes longer to reach temperature after defrosting or loading warm food, but then stays cold longer and turns on less often. An empty refrigerator turns on more often, but runs in short cycles. An abrupt violation of the cycle (does not turn off at all) does not depend on the amount of food.
What to do if the refrigerator has stopped freezing and does not turn off?
This is a classic sign of a freon leak or a serious blockage of the system. It is necessary to immediately defrost the unit (if it is not No Frost), dry it and call a technician to look for leaks and refill. Operating in this mode will finish off the compressor.