The refrigerator does not turn off: how to check and fix the problem yourself

Does your refrigerator hum around the clock without pausing? This is not just an annoying noise - it is a signal of a possible breakdown that can lead to food spoilage or serious repairs. Normally, the compressor should turn off for 10-20 minutes every hour, maintaining the set temperature. If this does not happen, the reasons may lie in faulty thermostat, refrigerant leak or even a banal incorrect operation.

In this article we will analyze all possible reasons continuous operation of the refrigerator - from simple (for example, Super Freeze modethat they forgot to turn off) to complex (breakdown of the start relay). You will learn how diagnose the problem yourself using a multimeter, thermometer and even a regular sheet of paper. And for those who are not ready to disassemble the equipment, we will give a checklist of 5 steps for an initial check without tools.

Spoiler: in 30% of cases is to blame condenser clogged with dust (it can be cleaned with a vacuum cleaner), and in 15% - incorrectly installed temperature sensor after defrosting. But first things first.

1. Primary diagnostics: what to check before disassembling the refrigerator

Before grabbing a screwdriver, rule out obvious causes that do not require repair. Start with an external inspection and check the settings:

• 🔌 Power and socket: make sure that the refrigerator is connected directly to the outlet (without extension cords), and the voltage in the network is stable (normal: 220V ±10%). Voltage surges cause the compressor to work without stopping.
• ❄️ Frozen mode: in models Samsung No Frost, LG Inverter and Atlant there is a function Super Freeze or Power Coolthat blocks shutdown compressor for 8-24 hours. Check if it is accidentally activated.
• 🌡️ Room temperature: If the refrigerator is standing next to a radiator or in the sun, the temperature sensor will record a false “heat” and force the compressor to work without pauses. Normal: +16…+32°C around the housing.
• 🚪 Door closure tightness: Place a sheet of paper between the seal and the housing. If it falls out or is easily pulled out, the seal is worn out and warm air gets inside.

If all of the above is in order, but the refrigerator still does not turn off, proceed to in-depth diagnostics. Attention: before any manipulations, disconnect the equipment from the network for 10 minutes - this will reset possible errors in the electronic unit.

2. Checking the thermostat (thermostat): step-by-step instructions

The thermostat is the “brain” of the refrigerator, which sends a signal to the compressor to turn on/off. If it breaks, the compressor will run continuously. You can check the thermostat without disassembling the case:

1. Manual adjustment: set the thermostat knob to MIN (minimum cooling). If the compressor does not turn off within 30 minutes, the thermostat is faulty.
2. Check with a multimeter:
   • Unplug the refrigerator.
   • Remove the thermostat protective cover (usually located next to the handle temperature adjustment).
   • Disconnect the wires from the thermostat terminals and short them together. If the compressor starts, the thermostat needs to be changed.
3. Temperature sensor test: in models with electronic control (Bosch KGE39, Indesit BIAA 13), the sensor may give incorrect readings. Check its resistance with a multimeter:
   • At +20°C: ~5-7 kOhm.
   • At +5°C: ~12-15 kOhm.

Signs of a faulty thermostat:

• 🔴 The compressor works without pauses, but the freezer is covered with ice.
• 🔴 The temperature in the refrigerator is below the set temperature (food is freezing).
• 🔴 There are no clicks when rotating the thermostat knob (which means the contacts are not open).

⚠️ Attention: In refrigerators with a system No Frost the thermostat is often combined with a defrost timer. If after replacing the thermostat the problem remains, check evaporator heater - its breakdown can also cause continuous operation of the compressor.

3. Diagnostics of the compressor and start relay

If the thermostat is working, but the refrigerator still does not turn off, the problem may be in compressor or start relay. Here's how to check them:

How to ring the compressor:

1. Disconnect the refrigerator from the network.
2. Remove the starting relay (usually it is attached to the compressor with one bolt).
3. Ring the compressor windings:
   • Resistance between C (common) and S (starting): 20-30 Ohm.
   • Resistance between C and R (working): 10-15 Ohm.
   • Resistance between S and R: the sum of the two previous values (30-45 Ohms).

If the resistance is different from the norm or equal to zero (short circuit), the compressor is faulty. In 80% of cases it is easier to replace it than to repair it — the cost of a new compressor for models Atlant or Stinol starts at 4,500 rubles.

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

Freon is a refrigerant that circulates through the system and cools the chambers. If it leaks, the compressor works non-stop, trying to reach the set temperature, but cannot do so. Signs of a leak:

• ❄️ The freezer does not freeze well, and the refrigerator does not cool at all.
• 🔥 The compressor is very hot (case temperature is above +80°C).
• 💧 On the floor there are oily spots under the refrigerator (freon mixed with oil).
• 📉 The pressure in the system is below normal (checked with a pressure gauge).

How to check the leak yourself:

1. Turn off the refrigerator and defrost it.
2. Inspect places where pipes are soldered (especially at the bottom of the back wall) for oil traces.
3. Check evaporator (plastic box in the freezer): if it is unevenly covered with frost, there may be a leak in this place.
4. Shine a flashlight on capillary tube - if it turns black, freon leaks through microcracks.

If you find a leak, do not try to seal it yourself — this requires special equipment (vacuum pump, freon cylinder, burner). The average cost of refilling freon at a service center: 2,500–5,000 rubles (depending on the model).

⚠️ Attention: In refrigerators with a system No Frost freon leakage is often accompanied by fan icing. If you hear the fan clinging to the ice, immediately defrost the refrigerator and call a technician.

What will happen if you do not eliminate the freon leak?

If you ignore the leak, the compressor will work on wear and tear, which will lead to its breakdown in 1-3 months. In addition, without freon, the temperature in the chambers will rise to room temperature and the food will spoil. In some cases (for example, if there is a leak in the foamed part of the housing), a complete replacement of the refrigeration unit may be required.

5. Problems with the electronic control unit

In modern refrigerators (Samsung RB37, LG GA-B489, Liebherr CN 4015), an electronic module is responsible for the operation of the compressor. If it fails, the compressor may work continuously or, conversely, not turn on at all. Causes of unit failure:

• ⚡ Power surges in the network.
• 💦 Moisture getting on the board (for example, during defrosting).
• 🔌 Short circuit in the sensor circuit.

How to check the electronic unit:

1. Unplug the refrigerator for 15 minutes, then turn it on again. If the problem disappeared, the failure was temporary.
2. Look at the display: if it shows an error (for example, E1, F2), decipher it according to the instructions for the model.
3. Test the power supply circuit of the unit with a multimeter:
   • Input voltage: 220V.
   • Output voltage (to the compressor): 12-24V (depending on the model).

If the unit is faulty, you can try to repair it (resolder the burnt elements) or replace it. The cost of a new module for refrigerators Bosch or Siemens is from 6,000 to 12,000 rubles. In some cases, it is cheaper to buy a used refrigerator than to repair the electronic unit.

6. Additional reasons: from a clogged capillary tube to incorrect installation

If all the main components are working, but the refrigerator still does not turn off, check:

• 🧊 Clogged capillary tube: if the system is clogged with dirt or oil, freon does not circulate and the compressor idles. Symptom: condenser (grid) rear) cold, although the compressor is humming. It can be eliminated by flushing the system in the service.
• 🔧 Incorrect installation: if the refrigerator is not level (tilted forward), the door may open slightly, letting warm air through. Check the level with a construction spirit level.
• 🌬️ Clogged fan (in No Frost models): if the fan does not spin, the cold is not distributed throughout the chamber, and the compressor runs non-stop. Check whether it is blocked by ice or foreign objects.
• 🔋 Malfunction of the defrost sensor: in refrigerators with No Frost the defrost sensor may stick, and the system “thinks” that defrosting is in progress, although it is not. The compressor does not turn off.

It is also worth checking temperature settings. In some models (Haier C2F636C, Beko GNE 120620), the default temperature is too low (for example, -24°C in the freezer), which is why the compressor runs almost without pauses. Optimal settings:

• Refrigerator compartment: +4...+5°C.
• Freezer compartment: -18°C.

7. When to call a technician: 5 signs of a serious breakdown

Not all faults can be fixed on your own. Contact a service center immediatelyif:

1. The compressor is working, but the refrigerator is not cooling, and the condenser (grid at the back) is cold - this is freon leak or system blockage.
2. Visible on the compressor housing oil smudges —this means the system's tightness is damaged.
3. Refrigerator electric shock or the RCD is triggered when turned on - an electrical problem (breakdown to the housing).
4. After replacing the thermostat or compressor problem returns after 1-2 days - perhaps the parts were selected incorrectly.
5. The display shows an error that cannot be reset (for example, F5 in Indesit or dH in Samsung).

The average cost of diagnostics in the service: 1,000–1,500 rubles. If the master offers repairs at home, check if he has:

• 🔧 Vacuum pump (for refilling freon).
• 📊 Pressure gauge (for checking pressure).
• 🔥 Torch and solder (for soldering tubes).

Without this equipment, high-quality repairs is impossible.

⚠️ Attention: Parts and prices for repairs may vary depending on the region and model of the refrigerator. Check current prices at service centers in your city.

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

Can the refrigerator does not turn off due to the heat in the apartment?

Yes, if the room temperature is above +30°C, the compressor is forced to work longer to maintain the set mode. In this case, it will help:

• Installing an air conditioner or fan next to the refrigerator (but do not direct the air flow directly at it!).
• Reduction loads: do not load the refrigerator to capacity with food.
• Check the door seal - in hot weather it may fit worse due to the expansion of materials.

How long can the refrigerator operate without stopping?

In normal mode, the compressor should be turned off for 10-20 minutes every hour. Maximum permissible continuous operation time:

• For conventional refrigerators: 2-3 hours (for example, after defrosting or loading a large amount of warm food).
• For inverter models (LG Inverter, Samsung Digital Inverter): up to 8-12 hours (they operate at reduced power, but without complete shutdown).

If the refrigerator does not turn off for longer than the specified time, this is a reason for diagnosis.

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

Possible causes and solutions:

• 💧 Moisture has entered the electronic unit: turn off the refrigerator for 12-24 hours to dry.
• ❄️ Ice is not removed from the drainage hole: clean the hole at the bottom of the refrigerator compartment with wire.
• 🔧 The settings have gone wrong: set the temperature again (optimally: +4°C for the refrigerator compartment, -18°C for freezers).
• 🔌 Problem with the temperature sensor: If after defrosting the refrigerator refreezes food, the sensor could have failed.

How to check if the compressor is working without disassembling the refrigerator?

Carry out an express test:

1. Unplug the refrigerator.
2. Remove the back cover (if there is one) and touch the compressor. Normally, it should be warm, but not hot.
3. Turn on the refrigerator and listen:
   • If the compressor buzzes, but does not start —the starting relay is faulty.
   • If the compressor starts and immediately turns off —a freon leak or an interturn short circuit is possible.
   • If the compressor works, but does not turn offand the refrigerator does not freeze, the capillary tube is clogged.

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

Short-term (1-2 days) - possible, but with reservations:

• ✅ Unload the refrigerator, leave only the most necessary products.
• ✅ Set the temperature to MIN (if this does not help, turn off the refrigerator for 2-3 hours every 6 hours to give the compressor a rest).
• ❌ Do not store perishable foods (meat, fish, dairy products) - the temperature in the chamber may be unstable.
• ❌ Do not ignore the problem for more than 3 days - this may lead to compressor breakdown.

If the refrigerator does not turn off due to a freon leak, you cannot use it - the food will spoil and the compressor will burn out.