The situation when the refrigerator does not turn offis familiar to many owners of household appliances. The device hums for days on end, trying to maintain the set temperature, but it never achieves the desired result. This not only causes your energy bills to skyrocket, but also creates constant background noise that interferes with your relaxation. In addition, continuous operation wears out compressorwhich can cause expensive repairs in the future.
In most cases, the problem lies in a violation of heat exchange or leakage refrigerant. Temperature inside the chambers simply does not drop to the required values, and the electronics or mechanical relay command the motor to continue working. Sometimes the culprit is the user himself, who has clogged the condenser grille with dust or set the cooling mode too low. In other situations, serious diagnostics and intervention by a specialist are required.
In this article we will analyze in detail all the possible reasons why refrigerator stopped turning off, and we will tell you what steps you can take on your own, and when it is better to call a specialist. Understanding the principles of operation of your model will help you avoid panic and unnecessary expenses.
Incorrect installation and violation of heat transfer
One of the most commonplace, but common reasons is violation of operating rules. If the unit stands close to the wall or in a niche without gaps, heat transfer it is violated. The heat removed from the radiator is not dissipated, but returns back to the body, causing the motor to wear out.
It is also important to check the condition of the sealing rubber on the doors. If seal it does not fit tightly, warm air from the room constantly flows inside. Sensors detect the temperature increase and prevent the compressor from stopping. Check the cleanliness and integrity of the rubber around the entire perimeter.
Often users themselves create problems by loading too much warm food into the chambers or leaving the door open for a long time. In such cases, the equipment simply does not have time to cool the air volume to the specified parameters.
⚠️ Attention: When installing the refrigerator, be sure to leave a gap of at least 5-7 cm between the back wall and the furniture. This is critical for air circulation.
For efficient operation of the cooling system, the following conditions must be met:
- 🔥 The distance from the wall to the radiator grille must be sufficient for free air circulation.
- ❄️ Do not place the refrigerator next to radiators, ovens or in direct sunlight rays.
- 🚪 Check whether the door closes tightly and that there are no foreign objects (crumbs, labels) in the way of the seal.
Freon leakage and problems with the cooling system
If the installation was carried out according to the rules, and the equipment still hums without interruption, there is a high probability refrigerant leaks. Freon is a working fluid that circulates through tubes, picking up heat. When its amount decreases, the cooling efficiency drops, and the motor is forced to work non-stop, trying to compensate for the shortage.
A leak can occur anywhere in the circuit: in the evaporator, condenser or pipe soldering areas. This often happens due to metal corrosion or mechanical damage. It is difficult to notice a leak visually, but an indirect sign is slight cold in the chambers when the compressor is running.
Another reason may be a blockage capillary tube. Oil breakdown products or moisture entering the system form an ice plug or blockage that prevents the normal flow of freon. The pressure in the system is disrupted and the refrigerator stops cooling effectively.
Is it possible to refuel the refrigerator yourself?
Independent refueling is impossible and dangerous. Special equipment is required to evacuate the system, search for leaks and accurately fill by weight. An attempt to simply “add gas” without eliminating the hole will lead to complete failure of the compressor.
Symptoms of problems with freon or blockage:
- 📉 The temperature in the main chamber is higher than normal, although the freezer may freeze more than usual.
- 🔊 Compressor works constantly, but shutdown cycles are absent or last only a few seconds.
- ❄️ On the evaporator tubes (inside the chamber) there may be an uneven distribution of frost or its complete absence.
Malfunctions of the thermostat and temperature sensors
In older models of refrigerators, thermostat (thermostat) is responsible for temperature control. This is a mechanical device that opens the electrical circuit when the chamber becomes cold enough. If the thermostat contacts are “stuck” in the closed position, the compressor will receive current constantly and will never turn off.
In modern models with a system No Frost and electronic control, the thermostat function is performed by temperature sensors (thermistors). They transmit data to the control module. If the sensor fails and transmits incorrect readings (for example, that it is warm in the chamber, although it is cold there), the “brain” of the refrigerator will not give the command to stop the engine.
Sometimes the problem lies not in the sensor itself, but in oxidation of the contacts or a break in the wiring going to it. In this case, the control system receives an error signal and goes into emergency mode of continuous operation or, conversely, does not turn on.
⚠️ Attention: Before replacing the thermostat or sensors, be sure to disconnect the refrigerator from the power supply. Working with live electrical components is life-threatening!
Diagnostics often require testing the elements with a multimeter. Here are the main signs of a malfunction:
- 🔌 The refrigerator does not respond to turning the temperature control knob.
- 🌡️ The device freezes until a “coat” of ice forms and does not turn off.
- ⚡ When you tap on the thermostat body, the refrigerator may accidentally turn off or turn on.
☑️ Diagnostics of the thermostat
Failure of the control module and relay
Electronic control module is the heart of a modern refrigerator. It is he who receives signals from sensors and controls the operation of the compressor, fans and defrost heating elements. If the motor control triac on the board burns out or there is a failure in the firmware, the shutdown command may simply not be received.
It is also worth mentioning the start-up relay, which is located on the compressor housing. Although its main function is to start the motor and protect against overloads, if the contacts stick, it can provide continuous voltage to the motor windings. This is a common problem in models with conventional (non-inverter) compressors.
Electronic failures often occur due to power surges in the network. If the lights flicker frequently in your house or there are fluctuations, the risk of failure of the control board increases many times over.
Comparison of signs of malfunction:
| Fault | Compressor behavior | Reaction to settings | Additional symptoms |
|---|---|---|---|
| Thermostat sticking | Works continuously | Does not respond | Severe freezing |
| Module failure | Chaotic operation | The display may glitch | Errors on the screen |
| Freon leak | Works, but does not cool well | Responses, but no effect | Hot capacitor |
Is it possible to repair the control module yourself?
Board repair requires deep knowledge of electronics and circuit design. Most often, the entire module is replaced, since searching for a burnt-out element and replacing it can cost more than a new board, and the warranty for such repairs is questionable.
Compressor wear and oil problems
The most expensive and serious problem is wear itself. compressor. Over time, the rubbing parts wear out, compression drops, and the engine is physically unable to create sufficient pressure for the freon to boil. It works constantly, trying to compensate for its weakness, but does not provide cold.
Another reason is thickening or burnout of the compressor oil. Oil is necessary for lubrication and heat dissipation. If there is little of it or it has lost its properties, the motor begins to overheat. The thermal relay may not have time to operate, or the engine will work “pull-in”, consuming increased current.
Inverter compressors, which are found in modern models (for example, LG, Samsung, Bosch), should not be turned off at all in the classical sense. They smoothly regulate power. However, if they begin to hum at full speed without reducing power when the temperature is reached, this is a sign of a malfunction.
⚠️ Attention: If the compressor gets very hot (burns your hand when touched) and only its body is hot, and the tubes are cold - most likely it has exhausted its service life and requires replacement.
Signs of a dying person compressor:
- 🔨 The motor makes a knocking, clanging or excessively loud hum.
- 🔥 The motor housing heats up to very high temperatures.
- 📉 Electricity consumption has increased sharply without changing the operating mode.
Other technical reasons for constant operation
There are a number of less obvious reasons why refrigerator does not turn off. For example, fan failure in the No Frost system. If the fan does not blow, the cold is not distributed throughout the chamber, the sensor does not see (a decrease in temperature) and keeps the compressor on.
The refrigerant switching valve may also be faulty (in dual-circuit systems). If the valve is stuck in the “freezer only” or “refrigerator only” position, one of the chambers will be overloaded, and the second will not cool, while the motor will work without stopping.
Sometimes the problem lies in a banal factory defect or a foreign object getting into the mechanisms. It is important to take into account the age of the equipment: for older models, constant operation is often a sign of natural wear and tear, for new ones it is a manufacturing defect.
What is worth checking first:
- 💨 Is the fan working inside the freezer (is air noise heard).
- 🔄 Are valve switching clicks heard (if a two-compressor model or with one compressor and a valve).
- 💡 Does the light inside light up when the door is closed (checking for leaks).
Why does the refrigerator hum but not freeze?
This is a classic sign of a freon leak or compression. The engine idles, chasing the remaining gas or simply creating noise, but no heat exchange occurs. You need to call a technician to find a leak.
Can the refrigerator not turn off due to the heat in the room?
Yes, if the room temperature is above +30...+32°C, the refrigerator can work almost without stopping, since the heat inflow is too great. This is not a breakdown, but a feature of working in extreme conditions.
How long should a refrigerator operate normally?
Under normal conditions, the operating cycle is approximately 15-20 minutes of work and 30-40 minutes of rest. Working time should not exceed 40-45% of the total time. If it works more than it rests, this is a cause for concern.
Is it dangerous to leave a running refrigerator unattended?
If the compressor is working properly and does not overheat critically, no. But if you hear a burning smell, see sparking, or feel that the plug/socket is getting very hot, immediately unplug the appliance.
Do you need to defrost the refrigerator if it does not turn off?
If the reason is ice freezing on the sensors or evaporator (which interferes with heat transfer), then complete defrosting (at least for 24 hours with doors open) may help temporarily. But if the problem is a leak or mechanics, defrosting will not help.