The situation when the refrigerator compressor hums around the clock, and the light in the chamber is on even when the door is closed, is familiar to many owners of household appliances. Normally, the unit should periodically “rest”, gaining cold, and then turning off until the temperature inside the chambers rises. If the motor runs without interruption, this not only leads to a sharp increase in electricity bills, but may also indicate a serious malfunction.
Ignoring the problem often leads to complete breakdown compressor of the system, the replacement of which is comparable in cost to buying a new device. Constant operation of the engine causes it to overheat, which destroys the lubricant and mechanical components. Therefore, it is important to diagnose the cause of the failure as quickly as possible.
In this article we will look in detail at why refrigerator it stopped turning off, how to distinguish a banal operating error from a complex technical defect and whether it is possible to fix the problem yourself without calling a technician.
External factors and operating errors
Before you panic and look for tools for disassembly, you should exclude external factors. Often the reason lies not in a breakdown, but in a violation of operating conditions. For example, if you have just loaded a large amount of warm products into the chambers, electronics gives the compressor a command to work in increased mode until the set temperature indicators are reached.
It is also worth checking the tightness of the doors. If sealing rubber is worn out, dirty or deformed, warm air constantly flows inside. Sensors detect an increase in temperature and prevent the system from going into standby mode. Simple cleaning or replacing the seal solves the problem.
⚠️ Attention: If the refrigerator is located close to the wall or in a niche without a gap for ventilation, heat is not removed from the condenser. This forces the motor to work at its limit, trying to compensate for the lack of heat exchange.
Another common scenario is installing the unit near heat sources. Heating radiators, ovens or direct sunlight heat the case, disrupting operation thermostat. In such conditions, equipment is forced to work almost non-stop.
- 🔥 Check the distance to the heating devices - it should be at least 50 cm.
- 🚪 Inspect the doors for distortions and the tightness of the seal.
- 🌡️ Make sure the room is not too hot (optimally up to +30°C).
- 🧊 Do not load hot foods, let them cool to room temperature.
Malfunction of the thermostat or temperature sensor
One of the most common technical reasons for continuous operation is the failure of the thermostat. In older models with mechanical control, it is responsible for temperature control thermostat. If its contacts “stick” in the “on” position, the compressor will work endlessly, even if ice has already formed in the chamber.
In modern models with a system No Frost and electronic control, this function is performed by air sensors. If such a sensor “lies” and shows that the temperature is higher than the real one, the “brain” of the refrigerator will not give the command to stop the engine. Diagnostics in this case requires a multimeter and electrical skills.
How to check the thermostat yourself?
To check a mechanical thermostat, you need to remove it and close the contacts directly. If the compressor starts working, the problem is in the thermostat. If not, look for the cause in the start relay or motor windings. Be careful, the operation is carried out under voltage!
Replacing the thermostat is a relatively inexpensive and quick procedure. In mechanical models, it is often located inside the camera or behind the control panel. In electronic systems, it may be necessary to replace the entire control module or a specific sensor, which is more difficult to diagnose without special equipment.
- 🛠️ Sign of breakdown: the refrigerator freezes too much or, conversely, does not turn off, but there is not enough cold.
- ⚙️ In mechanical models, the regulator often looks like a knob with divisions inside the chamber.
- 📉 Electronic sensors may produce errors due to oxidation of contacts.
Problems with the door seal
The tightness of the circuit is the key to efficient operation of the refrigerator. If sealing rubber loses elasticity, cracks or is simply contaminated with fat, a gap will form. Through it, warm air saturated with moisture penetrates into the chamber.
The system tries to compensate for heat loss by forcing the compressor to operate in a continuous cycle. This also leads to the formation of a “fur coat” of ice on the back wall or excessive snow freezing in the freezer. You can check the tightness with a simple test with a sheet of paper.
⚠️ Attention: Do not use aggressive chemicals to clean rubber. Alcohol or acetone can completely dry out the material, making it brittle. Use only warm soapy water.
If the rubber is simply dirty, just wash it thoroughly. If it is deformed, you can try to restore its shape using a hot hairdryer or boiling water, gently stretching the material. However, if the seal is cracked or torn, only complete replacement will help. data-i="94">Checking the magnetic tape replacement.
☑️ Seal diagnostics
Leakage of refrigerant (freon)
The most unpleasant and costly reason is leakage refrigerant. Freon circulates through a system of tubes, removing heat. If a microcrack appears in the circuit (often due to corrosion or mechanical damage during transportation), the gas gradually evaporates.
When freon becomes low, the refrigerator cannot reach the desired temperature. The electronics “think” that it needs to freeze more, and does not turn off the compressor. As a result, the motor wears out, trying to compensate for the lack of refrigerant, but there is no cold inside.
| Symptom | Probable cause | Action |
|---|---|---|
| Hot condenser on one side | Normal operation or blockage | Observation |
| Cold condenser | Freon leak | Call a technician |
| Frost only at the entrance to evaporator | Lack of refrigerant | Search for leaks |
| The motor is hot, but does not freeze | Critical leak | Urgent repair |
It is impossible to eliminate the leak on your own. Special equipment is required to find the location of the damage, solder the tubes and fill the system with new gas. Trying to simply “add freon” without eliminating the cause will only give a temporary effect.
Clogged capillary tube
There is a very narrow section in the refrigerant circulation system - the capillary tube. Through it, freon under pressure enters the evaporator. If there is moisture or oil oxidation products in the system, an ice or oil plug may form.
Clogging prevents normal gas circulation. The pressure at the outlet of the compressor increases, and at the inlet it decreases. The motor tries to push the coolant, working non-stop, but no cooling occurs. This is often accompanied by an unnaturally hot condenser.
Removing the blockage requires purging the system with high pressure nitrogen and replacing the filter drier. This is a complex technical procedure that is performed in service centers. In some cases, complete flushing of the circuit is required.
- 🔇 Characteristic sign: gurgling sounds in the tubes during operation.
- 🌡️ The compressor can overheat greatly and spontaneously turn off via a thermal relay.
- 🧊 The freezer may work normally, but the refrigerator compartment may not.
Malfunction of the control module
In modern models, the entire process is controlled electronic module. If the compressor relay burns out on the board or there is a failure in the firmware, the control signal can be supplied continuously. In this case, the engine receives the command to “run” regardless of the sensor readings.
Diagnostics of the board requires knowledge in radio electronics. You can often visually notice blackened traces or swollen capacitors. However, in 90% of cases, the entire module needs to be replaced or flashed, which is only possible under service conditions.
⚠️ Attention: Power surges in the network are the main cause of failure of electronic modules. To protect expensive equipment, it is recommended to use a voltage stabilizer.
Sometimes the problem is solved by a simple hard reset. To do this, unplug the refrigerator for 15–20 minutes and then turn it on again. If after a few hours the operating cycle has not returned to normal, the problem lies deeper.
Frequently asked questions (FAQ)
How long can the refrigerator operate without stopping after defrosting?
After complete defrosting and When turned on, the unit takes from 2 to 8 hours to reach the temperature and return to normal operation. During this time, the compressor can operate without interruption. If after 10-12 hours it does not turn off, look for a malfunction.
Can hot weather cause the refrigerator not to turn off?
Yes, if the room temperature exceeds +30°C, the heat dissipation from the condenser deteriorates. The refrigerator takes longer to cool down, and the pauses between starts may become very short or disappear. Ventilate the room or install a fan near the back wall.
Is it dangerous to leave a refrigerator running continuously on?
This is dangerous primarily for the compressor itself. It can burn out due to overheating of the windings. There is also a risk of the wiring melting or causing a fire in rare cases. It is better to turn off the power to the appliance before the technician arrives.
Why does a new refrigerator work constantly?
The first start-up of a new refrigerator can last up to 24 hours. At this time, the system enters the mode, cooling the empty volume and storing cold in the walls. If after a day the mode has not changed, check the temperature settings or contact the warranty department.