If your refrigerator runs around the clock, does not turn off and is very cold - this is not just an annoying noise, but a signal of a serious malfunction. Continuous operation of the compressor leads to increased wear of parts, increased energy bills and the risk of food spoilage due to unstable temperature. In 70% of cases, the problem is solved without calling a technician, but to do this you need to accurately determine the cause.
In this article we will analyze all possible reasons - from the banal clogged capillary tube to failure of the electronic module, and also give step-by-step instructions for diagnosis. We will pay special attention to models with a system No Frost (Samsung RB37**, LG GC-B247, Indesit DF 5200), where continuous operation is often associated with a malfunction of the fan or sensors.
Before starting repairs, check the obvious: whether the mode is turned on superfreezing (Super Freeze), not Is the freezer compartment overloaded with food and is the refrigerator located close to the wall (minimum gap is 5 cm). If these factors are excluded, read on.
1. Malfunction of the thermostat (thermostat)
The thermostat is the “brain” of the refrigerator, which monitors the temperature and sends a signal to the compressor to turn on/off. If it breaks, the compressor can work without stoppingas it does not receive a shutdown command. This problem is typical for models with mechanical control (Atlant MHM 1705, Biryusa 10, Stinol 102).
How to check the thermostat yourself:
- Unplug the refrigerator and remove all the food.
- Find the thermostat (usually located next to the temperature control knob).
- Remove the protective cover and inspect the contacts for oxidation or burning.
- Ring with a multimeter in mode resistance: at room temperature the resistance should be close to zero, when cooling (for example, if you put the thermostat in ice) it should tend to infinity.
If the thermostat does not respond to temperature changes, it must be replaced. The cost of a new part is from 800 to 2500 rubles, depending on the model. For refrigerators Liebert i Electrolux s. electronic control may require diagnostics of the board, since the thermostat is integrated into the sensor system.
2. Freon leak or clogged capillary tube
If the refrigerator freezes without stopping, but does not cool (the freezer is warmer than it should be, and the main compartment is too cold), the reason is most likely a refrigerant leak (freon) or a clog in the system circulation. This is one of the most serious breakdowns, as it requires the intervention of a specialist with refilling equipment.
Signs of a freon leak:
- 🔹 The compressor runs loudly and without pauses, but there is almost no cold.
- 🔹 Oily spots are visible on the back wall of the refrigerator (in the area of the condenser).
- 🔹 The evaporator tube does not become covered with frost or ice builds up only in certain areas.
- 🔹 After turning off the refrigerator for 10–12 hours, it does not restore cold.
Important: Never try to refill freon yourself. The refrigerant is toxic, and incorrect refilling can lead to an explosion! compressor. If you suspect a leak, call a technician. The average cost of repairs (leak detection + refilling) is from 3,500 to 6,000 rubles.
Clogging of the capillary tube often occurs due to moisture entering the system or corrosion. In this case, the technician flushes the system with a special solution and fills in new freon. For refrigerators Bosch KGN39XL30 and Siemens KD29EAL40 with the system No Frost the blockage can be caused by the accumulation of ice in the drainage system. system - this requires defrosting and cleaning.
3. Breakdown of the compressor or start relay.
The compressor is the “heart” of the refrigerator, and if it is working for wear, this is immediately noticeable by the following signs:
- 🔧 The refrigerator hums louder than usual, vibrates.
- 🔧 The compressor housing (the black “barrel” at the back) gets very hot (more 70°C).
- 🔧 Condensation or oil accumulates on the back wall.
- 🔧 The compressor turns on, but after a few seconds it turns off with a click (protection is triggered).
If the compressor works without stopping, but does not create the required pressure, the problem may be in:
- Interturn short circuit windings (replacement of the compressor is required).
- Wear piston group (typical for older models ZIL, Minsk, Orsk).
- Starter malfunctions relay (the part costs 500–1500 rubles and is replaced in 10 minutes).
To diagnose the compressor you will need a multimeter:
- Turn off the refrigerator and remove the protective casing from the compressor.
- Disconnect the start relay and test the windings:
- Resistance between
C (common)iS (starting)— 20–40 Ohm. - Resistance between
CandR (working)— 10–20 Ohm. - Resistance between
SandR—the sum of the two previous values.
- Resistance between
How to check the starting relay?
Disconnect the relay from the compressor and shake it. If you hear a knock or rattle inside, this is a sign of a malfunction. You can also ring the contacts: between 1 and 2 there should be resistance. ~10–20 Ohm, between 1 and 3 —infinity.
4. Problems with the electronic control module
In modern refrigerators (Samsung RB30J3000, LG GA-B489, Haier C2F636CWM) the electronic board is responsible for temperature regulation. If it fails, the compressor may receive a false command for continuous operation**. Reasons for module failure:
- 🔌 Power surges in the network (typical for houses with old wiring).
- 🔌 Moisture ingress. to the contacts (for example, during defrosting).
- 🔌 Short circuit in the sensor circuit.
Symptoms of board malfunction:
- 📛 The display shows an error (for example,
E1,F2or the indicator flashes temperature). - 📛 The refrigerator does not respond to pressing buttons.
- 📛 The compressor works without pauses, but the temperature in the chambers does not correspond to the set one.
To diagnose the board, you will need to inspect for burnt elements, check the voltage on the contacts (should be 5V or 12V depending on the model) and testing the sensors. In 30% of cases, flashing the module helps, but more often replacement is required (cost - from 2000 to 8000 rubles).
⚠️ Attention: If the refrigerator is under warranty, do not open the board case yourself! This will void the warranty! receipt.
5. Malfunction of temperature sensors
In refrigerators with electronic control (Samsung RL38**, BEKO CN 335220) sensors located in the freezer and refrigerator compartments are responsible for temperature control. If the sensor fails, the control board receives incorrect data and causes the compressor to work without stopping.
How to check the sensors:
- Unplug the refrigerator and locate the sensors (usually they are attached to the evaporator or the back wall of the chamber).
- Disconnect the sensor connector and measure the resistance with a multimeter:
Temperature Sensor resistance (kOhm) 0°C 27–30 +5°C 15–18 +20°C 5–7 -18°C 45–50 - If the resistance does not change when the temperature changes (for example, if you blow on the sensor with a hairdryer or put it in ice), it needs to be replaced.
The cost of the sensor is from 300 to 1200 rubles. In refrigerators Liebherr and Gorenje sensors are often included with the board, so replacement is more expensive.
Check the sensor resistance at room temperature|
Compare the readings with the table for your model|
Blow the sensor with warm air and measure the resistance again|
Inspect the connectors for oxidation|-->
6. Door seal failure
If the rubber seal on the door is worn out or deformed, warm air constantly enters the chamber. The compressor is forced to work non-stop to compensate for the loss of cold. This problem is often found in refrigerators older than 5 years (Indesit BIAA 13, Ardo FD 1000).
How to check the tightness:
- 🔍 Close the door and shine a flashlight along the seal. If the light is visible, the rubber band does not fit.
- 🔍 Place a sheet of paper between the door and the body. If it pulls out easily - the seal is worn out.
- 🔍 Pay attention to the ice on the back wall - if it grows unevenly, this is a sign of air leaks.
You can solve the problem in two ways:
- Adjust the door: loosen the hinges and level the position of the door so that it fits evenly.
- Replace the seal (cost - from 1000 to 3000 rubles). For models Samsung and LG original rubber bands can be ordered by part code (indicated on the label inside the refrigerator).
⚠️ Attention: If the seal is covered with mold, it is necessary not only to replace it, but also to treat the refrigerator body with an antiseptic (for example, a vinegar solution or a special product Top House).
7. Overloading the refrigerator or improper installation
Sometimes the refrigerator works without stopping due to external factors that are easy to eliminate on your own:
- 📦 Overload with food. If the refrigerator is packed to capacity, air circulation is disrupted and the compressor is forced to work longer. This is especially true for models with No Frostwhere the fan needs space to distribute the cold evenly.
- 🌡️ High room temperature. If the refrigerator is standing nearby. with a stove, battery or in the sun, it will overheat and turn on more often. The optimal temperature for operation is +16...+32°C.
- 🔌 Low voltage in the network. If the voltage is below 190V, the compressor cannot reach full power and operates continuously.
What to do:
- Unload the refrigerator, leaving gaps between products for air circulation.
- Check the gaps: there should be at least 5 cm between the back wall of the refrigerator and the wall, and 2-3 cm on the sides see
- Install a voltage stabilizer (for example, Resanta ASN-1000 or Stil IS350).
FAQ: Frequently asked questions about the continuous operation of the refrigerator
Is it possible to operate the refrigerator if it works without stopping?
For a short time (1-2 days) - it is possible, but this leads to overheating of the compressor and increased energy consumption. If the problem is not resolved, the risk of compressor failure increases by 3-4 times. It is better to immediately diagnose the cause.
Why does the refrigerator No Frost freeze without stopping, but the fan does not work?
Most likely, the fan or defrost sensor is broken. builds up on the evaporator, and the compressor cannot cool the chamber to the desired temperature. The fan needs to be replaced (cost: 1500–3000 rubles) or the system must be defrosted.
How often should the compressor be turned on in normal mode?
In modern refrigerators, the compressor operates in cycles: 10–20 minutes on, 20-40 minutes rest. The exact time depends on the model, load and room temperature. If the cycles are shorter than 5 minutes or the compressor does not turn off for more than 1 hour, this is a reason for diagnosis.
Can the refrigerator freeze without stopping due to a faulty condenser?
Yes, if the condenser (grid on the back wall) is dirty or damaged, heat transfer deteriorates and the compressor works longer. Clean the condenser with a vacuum cleaner or brush. If the tubes are damaged, replacement will be required (cost - from 2000 rubles).
What to do if the refrigerator begins to freeze without stopping after defrosting?
Probably, moisture got into the system during defrosting, which led to blockages or corrosion. Try turning off the refrigerator for 12 hours so that the moisture evaporates. If the problem persists, call a technician to check the freon circuit.