Why the refrigerator stopped turning off: reasons and solutions

The situation when The refrigerator stops turning offis familiar to many owners of household appliances. The device works for days on end, trying to reach the set temperature, but the compressor hums without interruption. This not only leads to a sharp increase in electricity bills, but also creates a constant background noise that can irritate household members.

There can be many reasons for this behavior: from a banal setting of the “Super Freeze” mode to a serious refrigerant leak. It is important to understand that the constant operation of the motor-compressor is emergency modewhich is not designed for long-term operation. If you ignore the problem, the engine resource will be exhausted many times faster, and replacing the compressor will cost much more than timely repairs.

In this article we will analyze in detail the main reasons why The refrigerator does not turn offand create an algorithm of actions for self-diagnosis. You will learn to distinguish software failures from mechanical breakdowns and understand when it is worth taking up the tools and when it is better to call a specialist.

Primary diagnostics: modes and settings

Before looking for breakdowns inside the unit, it is necessary to exclude the human factor. Often, users accidentally activate special operating modes that they forget about. For example, the "Super Freeze" (Super Freeze) function forces the compressor to work continuously for several hours or even days in order to freeze large quantities of food as quickly as possible. In this mode, the system ignores the thermostat readings.

It is also worth checking the temperature settings. If you set the temperature to the lowest possible temperature (for example, -24°C or "Min" mode), the refrigerator will try to reach this value indefinitely, especially if the door is opened frequently or warm food is loaded into the chamber. Modern models with electronic control may have a failure in the control module, due to which the shutdown command simply does not arrive.

⚠️ Attention: If you have activated the fast freezing mode, do not expect the refrigerator to turn off on its own. This mode must be turned off manually after the food has frozen, otherwise wear and tear on the equipment is guaranteed.

To check, follow these steps:

• 🔍 Inspect the control panel for the presence of lit snowflake indicators or the words “Super”, “Fast Freeze”.
• 🌡️ Set the average temperature values (usually +3...+5°C in the main chamber and -18°C in the freezer).
• 🔌 Try to completely defrost the unit (at least 24 hours) and turn it on without food to check the cyclical operation.

Faults in the defrost system and freezing of ice

One of the most common reasons why the refrigerator does not turn off, is a violation of the defrost cycle. In models with the system No Frost or Low Frost the evaporator is hidden behind a plastic panel. If the defrosting system (heating element, timer or defrost sensor) fails, an ice “coat” begins to grow on the evaporator.

This ice acts as a heat insulator, preventing normal heat exchange. A temperature sensor located in the chamber “sees” that there is not enough cold and gives the command to the compressor to continue working. As a result, the motor hums constantly, trying to break through the ice barrier, but the temperature in the chamber may even rise or remain on the verge of freezing.

Key symptoms of a faulty defrost system:

• ❄️ In the freezer compartment, a layer of ice or frost is visible on the back wall (if this is not a Full No Frost model).
• 💧 Water appears under the refrigerator or on the floor due to the drain pan being overfilled.
• 🔊 The compressor works without interruption, but the food in the main chamber is not cooled well.

To eliminate the problem, a complete defrost is often required in during the day. If, after turning on without food and ice, the refrigerator begins to operate in a normal cycle (turns on and off), then the problem lies in one of the elements of the defrosting system. The faulty part needs to be replaced.

Refrigerant leak: signs and consequences

If it occurs in the cooling circuit freon leak, the pressure in the system drops. The compressor begins to idle, trying to build up pressure and cool the chambers, but due to a lack of refrigerant this is impossible. The motor runs continuously, gets very hot, and the temperature inside the chambers either does not drop or drops very slowly.

A leak can occur in places where the tubes are soldered, in the foamed part of the housing (evaporator) or in the condenser. Often the cause is metal corrosion or mechanical damage during transportation or careless defrosting. Unlike other breakdowns, simple replacement of parts will not help here - you need to find the location of the leak, evacuate the system and refill with new refrigerant.

Main signs of a leak:

• 📉 The temperature in the chambers is higher than normal, despite the constant operation of the motor.
• 🔥 Condenser (the grill at the back) remains cold or warm only partially.
• 🔇 The compressor may operate quieter than usual or with a characteristic gurgling sound.

Is it possible to refuel the refrigerator yourself?

Independent refueling is impossible without special equipment (vacuum pump, pressure gauge station, scales). In addition, different models require a strictly defined type and amount of refrigerant (R600a, R134a). An attempt to refuel “by eye” will lead to compressor failure.

Problems with the seal and chamber tightness

The tightness of the refrigeration chamber is a critical parameter. If rubber seal the door is worn out, dirty or deformed, warm air from the room constantly enters the chamber. The temperature sensor detects an increase in degrees and does not give a command to turn off the compressor.

You can check the tightness in a simple way: clamp a sheet of paper between the door and the housing in different places around the perimeter. If the paper comes out easily, without resistance, it means that the seal does not fit in this place. It is also worth inspecting the rubber for cracks, tears or sticky deposits that could have formed due to fat or sugary drinks.

What to do if the seal is broken:

• 🧼 Wash the seal thoroughly with warm water and soap to remove grease and sticky layer.
• 💨 Use a hairdryer (at medium temperature) to warm up the deformed areas of rubber and straighten them.
• 🔧 If the rubber is cracked or has lost elasticity, the seal will need to be completely replaced.

Malfunction of the thermostat or temperature sensor

The thermostat (in mechanical models) or temperature sensor (in electronic ones) are the “eyes” of the refrigerator. It is this element that tells the compressor when to turn on and when to stop. If the thermostat is “stuck” in the “On” position or its contacts are oxidized, the circuit does not open and the motor runs endlessly.

In electronic models, a failure can be caused by a failure of the sensor itself (change in resistance) or a break in the wiring. Sometimes the sensor is working properly, but reads the readings incorrectly due to the displacement of the mounting location. In such cases, the refrigerator “thinks” that the chamber is +20°C, although in fact it is already -10°C.

Diagnostics of the thermostat:

• 🔌 In mechanical models, you can temporarily close the thermostat contacts (for testing) or replace it with a known good one.
• 📟 In electronic models, you need to ring the sensor with a multimeter at different temperatures and compare the readings with the resistance table.
• 👀 Inspect the capillary tube of the thermostat for damage or gas leaks.

Comparative table of symptoms and causes

To systematize the information and quickly understand why The refrigerator does not turn off, use the table below. It will help compare the observed symptoms with the most likely causes.

⚠️ Attention: If you find Oily spots under the refrigerator or on the pipes at the back, this almost always indicates a freon leak along with oil. It is impossible to fix such a malfunction on your own without equipment.

When you need to call a specialist

Not all problems can be solved with your own hands. If after checking the settings, defrosting and inspecting the seal the situation has not changed, the problem is probably in the “internals” of the unit. Opening a foamed evaporator, searching for micro-leaks, soldering tubes and filling with refrigerant require professional tools and qualifications.

Also, do not take risks if you do not know how to use a multimeter or do not understand the principles of operation of electrical circuits. Incorrect diagnosis can lead to replacement of working parts or, worse, to a short circuit. Remember that the cost of calling a technician is often lower than buying a new compressor that burned out due to incorrect experiments.

Urgently call the service if:

• 🛑 The compressor hums, clicks, but does not start (or turns off immediately).
• 🔥 Housing The refrigerator (especially the side walls) gets very hot.
• 💨 You can smell burning or plastic.
• 💧 A large puddle forms on the floor in a short time.

Is it worth repairing an old refrigerator?

Repair has It makes sense if the refrigerator is less than 7-10 years old and the compressor does not need to be replaced. If you need to change the compressor in a device older than 10 years, it is often more economically feasible to buy new equipment, since old oils and freons may be incompatible with new components.

Prevention and extension of service life

So that the question “why the refrigerator stops turning off” does not arise too often, it is important to follow the operating rules. Regular defrosting (even for No Frost systems is recommended once a year), keeping the seals clean and setting the temperature correctly will help avoid many problems.

Do not load hot foods into the chamber and do not place the refrigerator close to the wall - for normal operation of the condenser, a gap of at least 5-10 cm is required for air circulation. Overheating of the rear grille can also cause continuous operation of the motor.

Following these simple recommendations will allow your equipment to work for a long time and economically. If the problem has already arisen, we hope that our article helped you determine the vector of action and understand the scale of the necessary work.

Can the refrigerator not turn off due to power surges?

Yes, voltage surges can damage the electronic control module or the compressor start relay. In this case, the “brains” of the refrigerator may incorrectly process signals from the sensors, which is why the shutdown command is not received. To protect equipment, it is recommended to use a voltage stabilizer.

How long should a refrigerator normally operate?

In normal operation (when the chambers are approximately 50% full and the room temperature is +25°C), the refrigerator operates about 30-40% of the time. That is, out of one hour he should work for 20-25 minutes and rest for 35-40 minutes. If the operating time exceeds 50-60%, this is a cause for concern.

Is continuous operation of the refrigerator dangerous for the wiring?

Prolonged operation at maximum capacity leads to overheating of the compressor and start relay. This can cause insulation melting, short circuit and even fire. In addition, old wiring may not withstand long-term load if the refrigerator is connected to the network along with other powerful appliances.

What to do if the refrigerator stops turning off at night?

If you hear a continuous hum at night, first check if the super freeze mode is turned on. If not, listen to see if there are clicks of shutdown. If they have been gone for more than 2-3 hours, and it is already cold in the chambers, it is better to temporarily disconnect the device from the network until the technician arrives to prevent the motor from burning out.