Why the refrigerator turns itself off and on: 7 reasons and what to do about it

Have you noticed that the refrigerator has begun to behave strangely: the motor turns on and off for no apparent reason? Sometimes this is accompanied by relay clicks, a change in the operating sound, or even short-term defrosting of food. This behavior can either be a variant of the norm or signal a serious malfunction.

In this article we will analyze all the possible reasons for the spontaneous shutdown of the refrigerator - from harmless operating features to critical breakdowns. You'll learn how to diagnose the problem yourself, when you can get by with a simple setup, and when it's time to call a professional. We will also give specific recommendations for popular models Atlant, Samsung, Indesit and other brands.

Important: if the refrigerator turns off for a long time (more than 1-2 hours in a row) or stops freezing at all, this is no longer “cyclical operation”, but a breakdown. In such cases, read our guide to diagnosing a non-working refrigerator.

1. Normal operating mode: when shutdowns should not bother

Modern refrigerators are equipped automatic temperature control system, which turns the compressor on and off as needed. This is a normal process, and here are its key features:

• ⏱️ The compressor operates in cycles: on for 10-30 minutes, then rests for 10-40 minutes (depending on the model and load).
• 📉 The temperature in the chambers remains stable (check with a thermometer!).
• 🔊 Relay clicks when turning on/off are normal if they are not accompanied by a hum or vibration.
• ❄️ Ice does not form on the back wall (or it melts evenly during defrosting).

U inverter refrigerators (for example, LG DoorCooling+ or Samsung Twin Cooling Plus) the compressor operates almost continuously, but with variable power. They may appear to be "always on" when in fact they are simply gradually regulating the cold. But in classic models (Biryusa, Nord) the on/off cycles are more noticeable.

How to check that this is the norm? Put an outdoor thermometer in the refrigerator for 12 hours. If the temperature stays within ±2°C of the set temperature (usually +4...+5°C), and the freezer does not defrost, there is nothing to worry about. But if the spread is greater or the products begin to deteriorate, read on.

2. Compressor overheating: the most common cause of forced shutdowns

The refrigerator compressor has thermal protection - if it overheats, the relay forcibly turns off the power. This is not a breakdown, but protective measure against failure. But if such shutdowns occur frequently, the problem requires a solution.

Main causes of overheating:

⚠️ Attention: If the compressor turns off with characteristic click and turns on only after 10-15 minutes, and the rear grille is scalding hot - this is a sign interturn closure in the windings. In this case, the compressor must be replaced, and further operation is dangerous!

Ensure a gap of 5-10 cm from the wall|

Clean the rear grille from dust with a vacuum cleaner|

Check the room temperature (optimally 18-25°C)|

Unload the refrigerator if it is clogged by more than 70%|

Ring the thermostat with a multimeter (for advanced users)-->

3. Malfunctions of the thermostat or electronic control unit

If the refrigerator turns off randomly - sometimes for 5 minutes, sometimes for an hour - the culprit may be thermostat (in mechanical models) or control board (in electronic ones). These nodes are responsible for turning on the compressor based on the signal from temperature sensors.

Symptoms of malfunction:

• 🔄 The compressor turns on for 5-10 seconds and immediately turns off (the cycles are repeated often).
• 🌡️ The temperature in the chambers does not correspond to the settings (too high or too low).
• 🚨 An error flashes on the display (for example, E1 at Bosch or rH at Samsung).
• 🔌 The refrigerator does not respond to changes in operating modes.

To diagnose the thermostat in mechanical models (Atlant MXM-170, Saratos B138), you can use a simple test:

1. Disconnect the refrigerator from the network.
2. Remove the thermostat protective casing (usually located inside the refrigerator compartment).
3. Find two wires going to the thermostat and short them together (simulating a command to turn on).
4. Plug in the refrigerator: if the compressor is working, the thermostat is faulty.

⚠️ Attention: In refrigerators with electronic control (LG GR-B207, Samsung RB-30 J3000) independent diagnosis of the board is difficult and dangerous. Incorrect actions can damage the entire unit. In this case, it is better to call a specialist with diagnostic equipment.

How to reset an error on an electronic display?

For most refrigerators with a display, the error can be reset by holding the button Power or Temp for 5-10 seconds. For example, press and hold Samsung press and hold Fridge + Freezer at the same time. If the error appears again, repair is required.

4. Power supply problems: power surges and poor contacts

The refrigerator may turn off spontaneously due to unstable voltage in the network or problems with the socket. This is one of the most insidious reasons, because outwardly everything looks normal, but the equipment suffers.

Typical scenarios:

• ⚡ Surges voltage: If in your area the lights are often turned off or the voltage “jumps” (below 190V or above 240V), the refrigerator may turn off for protection.
• 🔌 Bad contact in the socket: Oxidized or loose contacts lead to micro-interruptions of power.
• 🔋 Faulty power supply filter: If the refrigerator is connected through an extension cord or filter, the problem may be there.
• ⚠️ Network overload: Simultaneous operation of several powerful appliances (for example, a refrigerator + microwave + kettle) can cause voltage sags.

How to check?

1. Connect the refrigerator directly to the outlet (without extension cords).
2. Check the voltage in the outlet with a multimeter (should be 220V ±10%).
3. Inspect the plug and cable of the refrigerator for melting or cracks.
4. If possible, connect the refrigerator via voltage stabilizer (for example, Resanta ASN-1000) for 1-2 days and observe the operation.

⚠️ Attention: If there are traces of melting on the plug or cable of the refrigerator, it is dangerous to operate it - there is a high risk of a short circuit! Immediately unplug and replace the power cord (at a service center).

5. Freon leak or clogged capillary tube

If the refrigerator begins to turn off less frequently than usual, but at the same time poor freezingthe reason may lie in refrigerant leak or a clogged system. This is a serious malfunction that requires the intervention of a specialist, but it can be diagnosed independently.

Signs of a freon leak:

• ❄️ The freezer is working, but there is no refrigerator compartment (or vice versa - depends on the location of the leak).
• ⏳ The compressor works almost non-stop, but the temperature does not drop to the desired temperature.
• 🔊 An unusual noise (gurgling, hissing) appeared in the first minutes after switching on.
• 🧊 On the back wall of the refrigerator compartment no frost (if the model has a “crying” evaporator).

When the capillary tube is clogged, the symptoms are similar, but often added:

• 🔥 The compressor gets very hot (you can get burned if you touch it).
• 🕒 The refrigerator can work normally 1-2 day, then “gets up” and turns off.

⚠️ Attention: If you suspect a freon leak, do not try to “top up” the refrigerator yourself. This requires special equipment, and incorrect refueling can lead to an explosion of the compressor! Contact a service center that has a vacuum pump and a leak detector.

6. Malfunctions of the start-up protection relay

The start-up protection relay is a small unit that starts the compressor and protects it from overloads. If the relay fails, the refrigerator may:

• 🔄 Turn on for 1-2 seconds and immediately turn off (with a characteristic click).
• 🚫 Not turn on at all (if the relay is “stuck” in the open state).
• ⚡ Work jerkily, with uneven pauses.

Causes of relay failure:

• 🕰️ Natural wear (service life 5-10 years).
• ⚡ Voltage surges in the network.
• 🔥 Overheating compressor (the relay is located next to it).
• 💧 Moisture ingress (for example, during defrosting).

How to check the relay?

1. Disconnect the refrigerator from the network.
2. Remove the relay cover (usually the black plastic box next to compressor).
3. Inspect the contacts for melting or black spots.
4. Shake the relay - if something rattles inside, this is a sign of a breakdown.

Replacing the relay is a relatively simple procedure that you can do yourself. The main thing is to choose analogue according to the compressor model (it has a tag with a brand, for example, Danfoss 104N0220). For popular compressors (Embraco, Secop), relays are sold in spare parts stores.

7. Additional reasons: from sensors to doors

Sometimes the refrigerator turns off due to little things that are rarely paid attention to. Check these points if the previous points do not apply:

• 🚪 Problems with the door: If the seal is torn or the door is warped, warm air gets inside. The compressor runs non-stop, overheats and shuts down. Check the seal a sheet of paper —if it falls out when the door is closed, it needs replacement.
• 🌡️ Faulty temperature sensor: In electronic models, the sensor may give incorrect readings, causing the compressor to work chaotically. Diagnosed only by a technician.
• 🧊 Frozen fan: In models with No Frost the fan may freeze over with ice and become blocked. The refrigerator turns off to prevent damage. It needs to be defrosted for 10-12 hours.
• 🔧 Loose compressor mount: If the compressor is loose, vibration can cause false protection triggers. Check the fastenings (nuts on the shock absorbers).

⚠️ Attention: If your refrigerator is equipped with a function Smart Diagnosis (LG), Digital Inverter (Samsung) or similar “smart” systems, self-diagnosis may give false shutdowns if the firmware fails. In this case, resetting the settings to factory settings will help (instructions are in the manual for the model).

FAQ: Frequently asked questions about spontaneous refrigerator shutdowns

My refrigerator Indesit BIAA 13 turns off every 5 minutes. Is this the norm?

No, this is not normal. Most likely, the problem is thermostat or start-protection relay often fails. First, check to see if the compressor is overheating (the rear grill should be hot, but not scalding). If the temperature in the chambers remains constant and the compressor does not hum constantly, the sensor may be faulty. In Indesit this series, the thermostat K59-L2555.

The refrigerator Samsung RL-34 turns on for 10 seconds and turns off. What to do?

This is a typical sign of a malfunction start-protection relay or turn-to-turn short circuit in the compressor. Turn off the refrigerator, remove the relay (black box next to the compressor) and inspect the contacts. If they are melted or smell like burning, replace the relay. If after replacement the problem remains, you need to diagnose the compressor.

After turning off the light, the refrigerator began to work strangely. Is this connected?

Yes, power surges could damage control board or compressor. If the refrigerator now turns off randomly or does not hold the temperature, check:

1. Voltage in the socket (should be 220V ±10%).
2. Integrity of the plug and cable.
3. Presence of errors on the display (if any).

If everything is in order, but the problem remains, call a technician to check the electronics.

Is it possible to replace the thermostat in the refrigerator yourself Atlant?

Yes, in most models Atlant (for example, MHM-1840) the thermostat can be changed simply:

1. Disconnect the refrigerator from the network.
2. Remove the temperature control knob (it is held on by latches).
3. Unscrew the thermostat mount and disconnect the wires (take a photo of their location!).
4. Install a new thermostat (for example, TAM-133-1M for Atlant) and connect the wires.

The cost of the thermostat is from 500 to 1500 rubles. The main thing is to choose the model according to the catalog number (it is indicated on the old thermostat).

How much does the repair cost if the refrigerator turns off due to a freon leak?

The cost depends on the model and region:

• Leak diagnostics: 1000-2000 rubles.
• Refilling with freon: 2500-4500 rubles (includes evacuation of the system).
• Repair of the leak: 1500-5000 rubles (soldering tubes, replacing the evaporator).

For refrigerators with No Frost the price may be higher due to the complexity of the system. In some cases (for example, a leak in the foamed part of the body), repairs are not cost-effective - it’s cheaper to buy a new refrigerator.