The refrigerator works without stopping: why this happens and what do

Have you noticed that the refrigerator motor is humming almost constantly, and the “rest” periods have become shorter or disappeared altogether? This is an alarming signal that cannot be ignored. Continuous operation of the compressor not only increases energy consumption by 30–50%, but also leads to accelerated wear of parts. In the worst case, the refrigerator may fail after 1-2 months of active operation in this mode.

Normally, the compressor should turn on for 10-20 minutes and turn off for 5-15 minutes (the ratio depends on the model, load and room temperature). If the cycle is broken, the problem lies either in settingsor technical malfunction. In this article we will analyze all possible causes, including those that are not described in the manufacturers' instructionsand give step-by-step recommendations for eliminating.

1. Incorrectly set temperature

The most common reason is inflated temperature values in the chambers. Many users mistakenly believe that the colder it is, the better it is for the food. In fact:

• 🥶 Optimal temperature for the refrigerator compartment: +4…+5°C
• ❄️ For the freezer: -18°C (for long-term storage), -12°C (for short-term)
• ⚠️ Each degree below normal increases the load on the compressor by 8–12%

How to check? Take thermometer for the refrigerator (or a regular street one) and put it on the middle shelf of the refrigerator for 12 hours. If the readings are lower +3°C, adjustment is required. In modern models (Samsung RL Series, LG InstaView, Bosch VitaFresh), the temperature is adjusted via the touch panel or mobile application. In old ones - a mechanical regulator (usually next to the light bulb).

⚠️ Attention: If your model has a function Super Cool or Power Freezeit can automatically lower the temperature after opening the door. Turn it off manually through the menu if the refrigerator does not return to normal mode after 2-3 hours.

2. Overloading of chambers or improper placement of products

The compressor works without stopping if:

• 📦 The refrigerator is filled to capacity with products (especially in the freezer). Air circulation is disrupted, and the sensors detect insufficient cooling.
• 🥩 Hot dishes are placed in the chamber. This increases the internal temperature by 5–10°C, forcing the motor to work harder.
• 🧊 The ice in the freezer has accumulated in a thicker layer 5 mm. It acts as a heat insulator, preventing the sensors from reading data correctly.

Solution:

Remove 20-30% of food for free air circulation|

Put hot dishes in a cool place for 1-2 hours|

Check the rubber seals on the door (see section 4)|

Defrost the freezer if the ice is thicker than 5 mm

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💡 Useful advice: In models with the system No Frost (Indesit NBA 18, ATLANT XM 4021) an ice crust forms less frequently, but defrosting is still required once every 6–12 months. In ordinary refrigerators - every 3-4 months.

3. Malfunction of the thermostat or temperature sensor

If the compressor does not turn off even after defrosting and adjusting the temperature, the fault is thermostat (in mechanical models) or thermistor (in electronic ones). These parts are responsible for signaling when the set temperature has been reached. If they break down, they either do not signal to turn off or give incorrect readings.

How to diagnose:

1. Disconnect the refrigerator from the network for 10 minutes, then turn it on again. If the compressor immediately starts working without pauses, the problem is in the sensor.
2. Shine a flashlight on thermistor (usually located next to the lamp or on the back wall). If it is covered with frost or the contacts are oxidized, replacement is required.
3. In mechanical models (Birusa 130, Snaige FR320), check the thermostat: turn the regulator to minimum cooling. If the motor does not turn off after 30–40 minutes, the part is faulty.

How to check the thermostat with a multimeter

Disconnect the thermostat from the wires and put the multimeter in resistance testing mode. At room temperature, the resistance should be 0 Ohm (contacts closed). Place the sensor in ice - the resistance should become ∞ (contacts open). If the readings do not change, the thermostat must be replaced.

⚠️ Attention: In refrigerators with electronic control (Samsung RB Series, LG Door-in-Door), replacing the thermistor requires reflashing the board. Self-repair without experience can lead to total failure of the cooling system. In such cases, it is better to call a specialist.

4. Wear or damage to the sealing rubber

Torn, hardened or dirty rubber on the door allows warm air into the chamber. The compressor is forced to work non-stop, trying to compensate for the heat gain. It’s easy to check the tightness:

1. Take a sheet of A4 paper.
2. Close the door, holding the sheet between the rubber band and the body.
3. Pull the sheet. If it comes out without effort the seal is faulty.

Causes of damage:

• 🧽 Washing with aggressive detergents (bleach, acetone).
• 🔥 Overheating from nearby heating devices (stoves, microwaves).
• 🐭 Damage by rodents (relevant for cottages and private houses).

Solution:

• 🧼 Wipe the rubber band soap solution and lubricate silicone grease (do not use vegetable oil!).
• 🔧 If the rubber band is torn, replace it. For models ATLANT, Stinol and Indesit seals are sold in service centers by article number (indicated in the refrigerator passport).

5. Freon leak or clogged capillary tube

If the refrigerator works without stopping, but does not freeze (or freezes weakly), the reason may lie in:

• 🧊 Leakage of freon - the refrigerant circulating through the system. Occurs due to corrosion of tubes or mechanical damage.
• 🔧 Clogged capillary tube - a thin channel through which freon enters the evaporator. The blockage is formed due to the ingress of moisture or oil.

Signs of a freon leak:

⚠️ Attention: Repairing a freon leak or cleaning the tube requires special equipment (vacuum pump, refrigerant cylinder) and certified technician. Independent attempts to charge the system can lead to explosion or poisoning with freon vapors.

6. Failure of the control board or compressor relay

In modern electronically controlled refrigerators (Samsung Family Hub, LG ThinQ), the compressor is responsible for the operating cycle control board. If it fails, the motor may:

• 🔄 Work without stopping.
• 🛑 Suddenly turn off and not turn back on.
• 🔊 Make clicking or buzzing sounds without startup.

Causes of board failure:

• ⚡ Power surges in the network (especially important for rural areas).
• 💧 Moisture ingress due to condensation or leakage.
• 🔥 Overheating due to close proximity to the stove or battery.

Diagnostics:

1. Unplug the refrigerator for 15 minutes, then turn it on. If the problem remains, the board is faulty.
2. Look at the indicators: flashing lights or errors on the display (for example, E1, FF at Bosch) indicate a failure in the electronics.
3. Check start-protection relay (black boxes on the compressor). If it gets hot or smells like burning, replacement is required.

💡 Key conclusion: In 80% of cases, the board can reflash or be repaired (replacing capacitors, cleaning contacts). Complete replacement is required only in case of physical damage (melted tracks, burnt microcircuits).

7. External factors: room temperature, ventilation

The compressor may not turn off due to unfavorable operating conditions:

• 🌡️ The room temperature is higher 30°C. The refrigerator is not designed to work in such conditions - heat exchange is disrupted.
• 🚫 No gap between the refrigerator and the wall (minimum 5 cm is needed for air circulation).
• ☀️ Direct sunlight rays on the back wall (increases the heating of the condenser).

Solution:

• 📏 Move the refrigerator so that there is 5–10 cm between it and the wall.
• 🌬️ Install the fan opposite the condenser (grids at the back), if the temperature in the room is higher 28°C.
• 🔌 Use voltage stabilizerif there are frequent surges in the network (relevant for cottages and old houses).

What to do if nothing helps?

If you have tried all the methods, but the compressor still does not turn off:

1. 📞 Call a specialist from service center (especially if the refrigerator is under warranty). Specify the model and symptoms - this will speed up the diagnosis.
2. 🔧 For older models (ZIL, Minsk, Donbass) find a repair shop for Soviet equipment - their compressors and thermostats have unique characteristics.
3. 💰 If repairs are impractical (the cost exceeds 50% of the price of a new refrigerator), consider purchasing a new model with inverter compressor (Samsung Digital Inverter, LG Smart Inverter. They are quieter and more economical.

⚠️ Attention: Do not ignore the problem! According to statistics from service centers, 70% of compressor failures occur due to prolonged operation without shutting down. The average cost of replacing a motor is 8 000–15 000 ₽ (depending on the model).

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

Can the refrigerator work without stopping due to a new compressor?

Yes, for the first time 24–48 hours after replacing the compressor or refilling freon, the equipment can work in increased mode. This is normal - the system is “grinding in”. If after 2 days the cycle has not been restored, contact the service.

Why did the refrigerator No Frost begin to work longer after defrosting?

Probably, after defrosting the mode was turned on Fast Freeze (quick freezing). It turns off automatically after 24–72 hours. If the problem remains, check the defrost sensor (it may stick in the “heating” position).

How does frequent opening of the door affect the operation of the compressor?

Each opening increases the temperature in the chamber by 2–5°C. If the door is opened more than 20 times a day, the compressor is forced to work at 30–40% longer. Solution: plan loading/unloading of products in advance.

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

Yes, in models ATLANT the thermostat is secured with 2-3 screws and connected via a connector. The main thing is do not mix up the wires (take a photo of the circuit before disconnecting) and buy the original part according to the article number from the passport.

Why does a new refrigerator work without stopping for the first 3 days?

This is normal for new models (Bosch Serie 6, Electrolux NutriFresh). They pass test cycle to stabilize the temperature. If after 3-4 days the operation has not returned to normal, check the settings and seals.