The situation when the refrigerator is constantly running and does not turn off is familiar to many owners of household appliances. You notice that the usual rhythm of work is disrupted: the engine hums without stopping, and rest cycles have completely disappeared. This not only irritates the ear, but also seriously affects the wallet, since electricity consumption in such conditions it increases significantly.
Ignoring this problem can lead to complete failure compressor, replacing which often costs more than buying a new budget unit. In this article, we will analyze in detail why this happens, which components most often break down, and whether it is possible to handle the repair yourself without resorting to the help of expensive craftsmen.
The first thing you need to understand: a refrigerator is not a perpetual motion machine. It requires periodic rest to cool the motor windings and stabilize the pressure in the system. If you see that temperature indicator it is on, but the motor does not stop, it means that the control system does not receive a signal that the set parameters have been reached.
Why the refrigerator stopped turning off: main factors
Before you panic, it is worth analyzing the external operating conditions. Often the reason lies not in a breakdown, but in a banal violation of installation or maintenance rules. Thermostat is the “brain” that gives the command to stop, but if environmental conditions do not allow it to reach the desired temperature, it will drive the motor further.
One of the common reasons is wear of sealing rubber on the doors. If the rubber band does not fit tightly, warm air from the room constantly enters the chamber. Sensors detect an increase in temperature and do not allow the compressor to stop, trying to compensate for the heat influx.
It is also worth paying attention to the location of the unit. If it stands close to the wall or in a niche without a gap, heat transfer it is violated. The condenser (grid at the back) cannot effectively transfer heat to the environment, which leads to overheating of the system and continuous operation.
- 🔍 Seal tightness: check whether dishes or food interfere with the closing of the door.
- 🌡️ Temperature in the room: in summer In hot weather, the refrigerator works more intensely, this is normal, but it should not be around the clock.
- 🚪 Frequency of openings: if you often look inside, the system does not have time to restore the cold.
⚠️ Attention: If you recently defrosted the refrigerator and turned it on, do not allowing it to dry completely, or loading a lot of warm food at once, continuous operation for the first 6-12 hours is the normal mode.
Malfunctions of the thermostat and sensors
If external factors are excluded, most likely the problem lies in thermostat (thermostat). This element is responsible for breaking the electrical circuit when a certain temperature is reached. If its contacts are “stuck” in a closed state or the sensing tube is broken, the stop signal simply will not be sent to the start relay.
In models with a system No Frost and electronic control, the temperature is monitored sensors (thermistors). Their resistance changes depending on temperature. If the sensor fails and shows incorrect data (for example, that the chamber is +10°C instead of -18°C), the controller will keep the compressor on.
Diagnostics of a mechanical thermostat is often carried out by the method of exclusion. In some cases, you can temporarily close the contacts to check whether the compressor will start, but to check the shutdown, it is better to call a technician with a tester, since an accurate resistance measurement is required.
How to check the thermostat yourself?
To check a mechanical thermostat, you can lower its sensitive tube into cold water with ice. If there is no click and the contacts do not open, the part is faulty. However, remember that to replace it you will need to disassemble part of the housing.
Refrigerant leak: the silent enemy of your refrigerator
One of the most insidious reasons why the refrigerator does not turn offis a freon leak. The refrigerant circulates in a closed circuit, but over time, microcracks may form in solder joints or in the foamed part of the housing. Freon evaporates, and its quantity becomes insufficient for effective cooling.
The compressor tries to compensate for the lack of refrigerant, working for wear. It hums, but does not produce cold (or produces very little). As a result, temperature conditions is not achieved, and the work cycle is not interrupted. This is a classic situation when “the refrigerator freezes but does not turn off.”
It is almost impossible to determine the leak visually, since freon is a colorless and odorless gas. An indirect sign may be swelling of the evaporator (in older models) or the appearance of oily spots in the lower part of the unit near the compressor.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Humming, but not freezes | Freon leak / Clogged | High (needs a technician) |
| Freezes weakly, does not turn off | Compressor wear / Leakage | Medium/High |
| Freezes normally, but buzzes | Thermostat malfunction | Low/Medium |
| Buzzes intermittently, clicks | Problems with the start relay | Low |
⚠️ Attention: Self-filling the refrigerator with freon is dangerous and requires special equipment (vacuum pump, pressure gauge station). Without creating a vacuum in the system, a new portion of gas will mix with air and moisture, which will lead to rapid failure of the compressor.
Problems with the compressor and start relay
Compressor is the heart of the refrigerator. If it is worn out, its performance decreases. The piston group can exhaust its service life, the valves allow gas to pass through, and the pressure in the system is not pumped up to the required level. As a result, the refrigerator runs “idle”, trying to gain temperature.
Often the culprit of continuous operation becomes start relay. This small block is responsible for starting the engine and protecting it. If the relay contacts are burnt or the mechanism is stuck, the compressor may not receive a command to stop or, conversely, constantly tries to start, making clicking noises.
Replacing the start relay is one of the simplest procedures. It is enough to remove the back cover, disconnect the old unit and install a new one that matches the engine model. However, if the problem is in the motor-compressor itself, replacing it requires resoldering the tubes and refueling the system.
The influence of the No Frost system and defrosting
In refrigerators with the system No Frost another layer of complexity is added. Here, not only the thermostat, but also the defrosting system is responsible for the temperature. If the defrost timer or defrost sensor fails, the evaporator becomes covered with a “coat” of ice. Defrost heating element, defrost timer or defrost sensor, the evaporator becomes covered with a “coat” of ice.
Ice blocks the circulation of cold air. The sensors in the chamber “do not see” the cold, since the air flow is blocked by an ice plug, and give the command to the compressor to continue working. Visually, it may be warm in the chamber, and behind, behind the plastic panel, there is a huge piece of ice.
Checking the defrosting system requires testing each element of the circuit with a multimeter: the heater, bimetallic sensor and timer (or control board). Often the problem is solved by replacing a burnt-out heating element or a “stuck” sensor.
☑️ Diagnostics of the No Frost system
Algorithm of actions when a problem is detected
If you are faced with the fact that The refrigerator does not turn off, act consistently. Do not rush to disassemble the unit until you rule out simple causes. Start by checking that the doors are tightly closed and that there are no drafts at the installation site.
Listen to the sounds. A uniform hum indicates that the compressor is operating, intermittent clicks indicate attempts to start or the operation of the relay. If the compressor is hot to the touch (in the area of the motor), but there is no cold, this is a sure sign of a leak or loss of performance.
Try to defrost the refrigerator completely (for 12-24 hours with the doors open). If, after turning on, it gains temperature and turns off, the problem was in the defrost system or an ice plug. If the situation repeats after a couple of days, repairs are needed.
⚠️ Attention: Technical characteristics, location of sensors and electrical circuit diagrams may vary depending on the brand (Indesit, Bosch, LG, Samsung) and year of manufacture. Always check the technical documentation for your specific model before starting disassembly.
FAQ: Frequently Asked Questions
How long can the refrigerator operate without stopping after being turned on?
After the first turn on or complete defrosting, the refrigerator can operate continuously until 12-24 hours until it reaches operating temperature and freezes food. If it does not turn off for more than a day, this is a malfunction.
Is it dangerous if the refrigerator hums and does not turn off?
Yes, it is dangerous. Long-term operation without rest cycles leads to overheating of the compressor windings, melting of the insulation and eventual combustion of the engine. In addition, this significantly increases the risk of fire and electricity bills.
Is it possible to operate the refrigerator if it does not turn off until the technician arrives?
It is highly not recommended. If possible, it is better to turn off the unit, defrost it and remove the food to avoid spoilage. Operation in emergency mode finishes off the compressor, making repairs economically unfeasible.
Why does a new refrigerator constantly work?
When first started, a new refrigerator can work for a long time (up to 24 hours) for initial cooling. Also check if the “Super Freeze” mode is turned on (usually indicated by a snowflake or the Super button), which forcibly keeps the compressor on.