Why the refrigerator does not turn off: a complete analysis of the causes and solutions

Normal operation of the refrigerator involves cyclic turning on and off of the compressor. On average, the motor should rest 10-20 minutes every hour, and in modern models with inverter compressors this interval can stretch up to 2-3 hours. But what to do if the unit works for days on end, without stopping for a minute? This problem not only increases electricity bills, but also signals possible malfunctions that lead to premature wear of equipment.

In 80% of cases, continuous operation of the refrigerator is associated with violation of the thermal balance - when the temperature inside the chambers is higher than the specified one. However, the reasons may lie in mechanical failures and operating errors. Next, we will analyze all possible scenarios: from those that you can fix yourself in 5 minutes, to those that require the intervention of a specialist.

1. Violation of operating rules: what did you miss?

Before sinning on equipment, check whether you are not violating basic rules for using a refrigerator. Many “breakdowns” are actually the result of improper operation.

For example, if you they loaded a large amount of warm food into the chamber (for example, after shopping or preparing meals for the week), the compressor will work longer than usual to cool the volume. Normally, this may take up to 6-8 hours - especially in hot weather. But if the refrigerator does not turn off after 12 hours, the problem is deeper.

Another common mistake is the door is not tightly closed. Even a gap of 2-3 mm is enough for warm air to penetrate inside, forcing the motor to work without interruption. Check:

• 🧲 Sealing rubber for cracks, dirt or deformations. Over time, the rubber loses its elasticity and ceases to seal the chamber.
• 📦 Door overload - bottles, bags or heavy products can interfere with tight closure. In models with French Door (two-door) this is especially true.
• 🔧 Hinges and closing mechanism - if the door sags or closes with force, it needs to be adjusted.

Also pay attention to location of the refrigerator. If it sits next to a stove, radiator, or in direct sunlight, heat from external sources causes the compressor to work harder. The optimal room temperature for most models is 16-32°C. At +35°C and above, many refrigerators physically cannot turn off due to overheating of the condenser.

2. Malfunctions of the thermostat and temperature sensors

If the refrigerator does not respond to temperature changes (for example, continues to freeze even at -20°C in the chamber), the fault is thermostat or temperature sensor. These elements are responsible for signaling the compressor to turn on/off.

How to understand that the problem is in them:

• 🌡️ In the refrigeration room chamber ice has formed on the back wall (in models with a drip system), although you did not turn on the super-freezing mode.
• ❄️ The freezer freezes the food - they become covered with a thick layer of frost, and the temperature drops below -24°C.
• 🔄 The compressor works without pauses, but the chambers are not cooled (or are poorly cooled).

In refrigerators with electronically controlled (for example, Samsung RB37J5230SA, LG GA-B489YDQZ) the resistance sensor is responsible for the temperature. If it breaks, the control module receives incorrect data and forces the compressor to work constantly. In mechanical models (for example, thermistor — resistance sensor. If it breaks, the control module receives incorrect data and forces the compressor to work constantly. In mechanical models (for example, Atlant XM-4021-000) it breaks thermostat —its contacts “stick” in the “on” position.

You can check the thermostat with a multimeter:

1. Disconnect the refrigerator from the mains.
2. Remove the thermostat protective cover (usually located next to the lighting lamp).
3. Connect the 2 wires going to the thermostat with each other (if the model is mechanical).
4. Turn on the refrigerator - if the compressor working, the thermostat is faulty.

3. Freon leak: how to recognize and what to do

Freon is a refrigerant that circulates through the refrigerator system and is responsible for cooling. If this happens leakage, the compressor starts working without stopping, trying to compensate for the loss of cold. At the same time, the cooling efficiency decreases: food in the refrigerator compartment deteriorates faster, and in the freezer, a leak may appear on the evaporator. freon: snow "coat" on the evaporator.

Signs of a freon leak:

• 🔍 The condenser (grid at the back) remains cold even after long-term operation of the compressor.
• 💧 oily stains appear on the floor under the refrigerator (freon mixed with compressor oil).
• 🔊 The compressor is louder than usual, but the cooling is weak.

The most common cause of leakage is mechanical damage to the tubes (for example, when moving the refrigerator or inaccurate defrosting). Also, freon can leak through microcracks in evaporator or condenserwhich are formed due to corrosion or vibration.

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Attention! Refill freon yourself without special equipment and certificate prohibited. The refrigerant is toxic, and improper charging can cause the compressor to explode. Contact the service center - technicians use leak detectors and vacuum pumps for safe refueling.

4. Capillary tube clogged: why the refrigerator “chokes”

The capillary tube is a thin channel through which freon enters the evaporator. Over time, it may clogged due to moisture, oil or small particles. As a result, the refrigerant cannot circulate normally, and the compressor wears out, trying to push freon through the blockage.

Symptoms of capillary blockage:

• 🔥 Compressor overheats (you can touch it with your hand - it will be scalding hot).
• ❄️ In the freezer ice has formed on only one area evaporator.
• ⏳ The refrigerator cools for a very long time, and after switching off it quickly heats up.

A blockage is often confused with a freon leak, but there is a key difference: with a blockage the condenser (rear grill) heats up unevenly one part is hot, the other is cold. Normally, it should be uniformly warm.

The blockage can only be removed by flushing the system or replacing the capillary tube. This is a complex procedure that requires:

1. Pumping out residual freon.
2. Purge the system with nitrogen.
3. Replacements filter-drier.
4. Evacuate and refill freon.

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Attention! If you decide to flush the system yourself, never use water or household solvents. For these purposes, special refrigerant R141b or liquid nitrogen is used. Improper flushing will lead to corrosion of the tubes and re-clogging.

5. Compressor failure: when the motor runs but does not cool

The compressor is the “heart” of the refrigerator. If it fails, the consequences can be different:

• 🔄 Motor works without stopping, but there is no cold (winding break or interturn short circuit).
• 💥 Compressor turns on and turns off immediately (failure of the starting relay).
• 🔊 Appears strong hum or knocking (wear of the piston group).

The most dangerous breakdown is turn-to-turn short circuit in the winding. In this case, the compressor consumes a current higher than normal, which can lead to fire or tripping of the machine in the panel. You can check the winding with a multimeter:

1. Turn off the refrigerator and discharge the capacitor (short-circuit it with a screwdriver).
2. Remove the cover from the compressor and disconnect the wires.
3. Measure the resistance between the terminals:
   • Common point (C) - Starting (S): should be ~20-40 Ohm.
   • Common point (C) - Operating (R): ~10-20 Ohm.
   • Starting (S) - Operating (R): ~30-50 Ohm (sum of the two previous ones).

If the resistance is equal 0 (short circuit) or ∞ (break), the compressor is faulty.

In some cases, the compressor can be “reanimated” by replacing start relay (costs ~1,000–2,500 ₽). But if the winding burns out, you will need complete replacement of the motor (from 5,000 ₽ and above). For refrigerators older than 10 years, this is often unprofitable - it’s cheaper to buy new equipment.

How to check the start relay?

Turn off the refrigerator and remove the relay from the compressor. Shake it - if you hear knocking or rattling, this is a sign of a malfunction. Also inspect the contacts for melting or blackening.

6. Problems with the electronic control module

In modern refrigerators, the display and touch control (for example, Bosch KAN92VI30R, Liebherr CNef 4815) is responsible for the operation of the compressor. electronic control unit (ECU). If it fails, the following symptoms may be observed:

• 📱 The display shows error (for example, E1, F2 or H1 —for decoding, see the instructions for the model).
• 🔄 The compressor turns on and off chaotic, without reference to temperature.
• 🔌 Refrigerator does not respond to settings (does not change mode, does not turn off).

Causes of ECU failure:

• ⚡ Power surges on the network (especially important for houses with old wiring).
• 💦 Moisture ingress on the board (for example, during defrosting or leakage).
• 🔧 Short circuit in the sensor circuit.

It is not recommended to repair the electronic module yourself - this requires soldering equipment and knowledge of circuit design. However, you can:

1. Turn off the refrigerator for 10-15 minutes and then turn it on again (sometimes it helps resetting errors).
2. Check fuse on the board (if it is burned out, replace it with a similar one).
3. Inspect the board for the presence of melted elements or traces of corrosion.

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Attention! If traces of burning or swollen capacitors are visible on the control board, do not try to turn on the refrigerator - this may cause k fire. Immediately disconnect it from the network and call a technician.

7. Fan malfunction: why the refrigerator “chokes”

B models with a system No Frost (for example, Indesit DF 5200 W, BEKO GNE 114620 X) is responsible for air circulation. fanIf it breaks down, the cold ceases to be evenly distributed throughout the chambers, and the compressor is forced to work without stopping, trying to compensate for the lack of cooling.

Signs of fan failure:

• 🌀 In the refrigerator compartment warmerthan in the freezer (difference more than 10°C).
• 🔇 No characteristic air noise when opening the door.
• ❄️ On the back wall of the freezer increases ice (the fan does not blow away moisture).

Most often the fan breaks due to:

• 🧊 Icing of the blades (if the refrigerator has not been defrosted for a long time).
• 🔌 Bearing wear (creaking or humming appears).
• 🔌 Power problems (wire break or motor malfunction).

To check the fan:

1. Turn off the refrigerator and defrost it (at least 12 hours).
2. Remove the back panel of the freezer (usually secured with latches or screws).
3. Try to turn the fan blades by hand - they should rotate easily and without jamming.
4. Connect the refrigerator and listen - if the fan does not start, it needs to be replaced.

8. When to call a technician: criteria for emergency repairs.

Some breakdowns can be fixed on your own, but there are situations when you need professional helpContact the service center if:

• 🔥 Compressor overheats to a temperature above 90°C (can be checked with infrared thermometer).
• 💨 From the refrigerator smells of burning or the smell of ozone is heard (a sign of a short circuit).
• ⚡ The display lights up unknown error, which cannot be reset.
• 🛠️ Required for repair special equipment (vacuum pump, leak detector, soldering station).

The cost of repair depends on the type of breakdown:

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Attention! If the refrigerator is under warranty, do not disassemble it yourself - this will lead to to loss of warranty. Contact the authorized service center of the brand (for example, for Samsung — in Samsung Service, for LG — in LG Electronics Russia).

Before the technician’s visit, prepare:

• 📄 Refrigerator passport (to confirm the model and date of purchase).
• 📋 List of symptoms (when did the problem, what have you already tried to do).
• 📸 Photo or video of the malfunction (if the error appears periodically).

FAQ: Frequently asked questions about the continuous operation of the refrigerator

Is it possible to use the refrigerator if it does not turn off?

Short-term (1-2 days) - yes, but this is fraught with:

• ⚡ Increased energy consumption (up to 2-3 times higher than normal).
• 🔥 Overheating of the compressorwhich leads to its breakdown.
• ❄️ Food spoilage (if the problem is a freon leak, the temperature may not be sufficient for safe storage).

If the refrigerator has been running non-stop for more than a day, turn it off and call a technician.

Why doesn’t a new refrigerator turn off in the first days?

This is normal! When turned on for the first time, the refrigerator operates reinforced modeto cool the empty compartments. Continuous operation time can reach:

• 🕒 2-4 hours for small models (up to 200 l).
• 🕒 6-12 hours for boxes with a volume of 300+ l.

If after 24 hours the compressor has not started to turn off cyclically, check the temperature settings (the mode may be set Super Cool or Fast Freeze).

How to check if the compressor is working if the refrigerator is not cooling?

Check test:

1. Unplug the refrigerator for 1 minute, then turn it on.
2. Put your hand on compressor (black cylinder at the bottom back).
3. If it vibrates and heats up - the compressor is working, but there is a freon leak or a blockage.
4. If it cold and quiet - the motor or start relay is faulty.

Can the refrigerator not turn off due to power surges?

Yes! If your network often has voltage surges (below 180 V or above 240 V), this can lead to:

• 🔌 Failure of the compressor relay (it "sticks" in the "on" position).
• 📱 Failure of the electronic module (especially in models with a display).

Solution: install voltage stabilizer (for example, Resanta ASN-10000/1-C or Energy Classic 10000).

What to do if the refrigerator does not turn off after defrosting?

Possible reasons:

• 💧 Moisture got on the electronic module — dry the refrigerator with a hairdryer (cold air!) for 1-2 hours.
• 🧊 The fan is frozen (in models No Frost) - defrost again, this time leaving the door open for 24 hours.
• 🔧 Gone wrong settings - reset the refrigerator to factory settings (instructions in the passport).