Why the refrigerator compressor is constantly on: reasons and what do

Have you noticed that the compressor of your refrigerator is running without interruption, and the body has heated up to an unpleasant temperature? This is not just an uncomfortable noise - a signal of a possible malfunction. Normally, the motor turns on for 10-20 minutes and rests for 30-40 minutes (cycles depend on the model and load). If the unit burns continuously, the risk of overheating and breakdown grows every minute.

In this article we will look 7 key reasonswhy the refrigerator compressor does not turn off - from a banal accumulation of dust to serious damage to the thermostat or Freon leaks. You will learn how to diagnose the problem yourself (even without tools), when you can get by with cleaning, and when you urgently need a technician. And also - why in 90% of cases it is not the compressor itself that is to blame, but the accompanying systems.

1. Refrigerator overload: when food interferes with cooling

The most common reason for continuous operation of the compressor is impaired air circulation inside the chamber. If the refrigerator is filled to capacity with food, and hot dishes are placed without cooling, the motor is forced to work hard to maintain the set temperature.

This is especially critical for models with a system No Frost (for example, Samsung RB37J5240SA or LG GA-B489YDQZ), where fans distribute the cold throughout the chamber. If the air flow is blocked, the sensors detect “under-freezing” and force the compressor to work without stopping. In this case, the body of the unit can heat up to 50-60°C.

• 🍗 Hot products: even one pan of soup +40°C increases the temperature in the chamber by 5-7°C.
• 🥶 Dense packaging: bags and containers should not touch the back wall (minimum gap - 2 cm).
• 🧊 Ice in the freezer: a layer of frost thicker than 5 mm impairs heat transfer by 30%.

⚠️ Attention: if the compressor burns after defrosting, do not rush to panic. For the first 2-3 hours it can work continuously, restoring the temperature. But if after 6 hours the motor does not turn off, look deeper for the reason.

2. Condenser contamination: dust as the main enemy of the compressor

The condenser (grid on the back wall of the refrigerator) is responsible for removing the heat generated by the compressor. If it is clogged with dust, animal hair or grease, heat exchange is disrupted and the motor overheats. As a result:

• 🔥 The temperature of the compressor housing rises to 70-80°C (the norm is up to 50°C).
• ⚡ Electricity consumption increases by 20-30%.
• ⏳ The operating time of the compressor increases by 2-3 times.

Checking for contamination is simple: move the refrigerator and shine a flashlight on the grille. If you can’t see the wall through it, it’s time to clean it. For models with built-in condenser (for example, Bosch KAN92VI30R), access to it can be from below behind the decorative panel.

After cleaning, the compressor should begin to turn off at standard intervals. If this does not happen, the problem is deeper.

3. Malfunction of the thermostat or temperature sensor

The thermostat (or electronic sensor in modern models) is the “brain” that tells the compressor when to turn on or rest. If it breaks, the motor either does not start at all or works continuouslybecause it “does not see” the real temperature.

Signs of a thermostat failure:

• 🌡️ In the refrigerator compartment +10°C and above, but the compressor does not turn off.
• ❄️ Too much ice forms in the freezer (even when the door is rarely opened).
• 🔊 Clicks when turning the thermostat knob (in mechanical models).

You can check the thermostat with a multimeter (in resistance mode). If the values ​​do not change when you turn the knob, the part needs to be replaced. In electronic models (for example, Samsung RL38TDCAS), it is often enough to reflash the control board.

4. Freon leak: when the compressor is idling

Freon is a refrigerant that circulates through the system and “takes” heat from the chamber. If it leaks (for example, due to corrosion of tubes or mechanical damage), the compressor starts working continuously, but the temperature in the refrigerator does not drop. It's like trying to pump up a flat tire: there is effort, but no result.

Causes of leakage:

• 🔧 Corrosion pipes (especially in older models ZIL or Minsk).
• 🐭 Damage by rodents (relevant for country houses and private houses).
• 🔨 Inaccurate repair (for example, after moving the refrigerator).

It is difficult to determine a leak on your own, but there are indirect signs:

• 🧊 The condenser (grid at the back) remains cold even after an hour of compressor operation.
• 💧 Oil on the floor under the refrigerator (freon evaporates, and the oil flows out of the compressor).
• 🔊 The compressor hums louder than usual, but does not turn off.

⚠️ Attention: if you suspect a freon leak, do not turn on the refrigerator - this can lead to the compressor jamming. Immediately disconnect it from the network and. call a technician.

What will happen if you ignore a freon leak?

Without refrigerant, the compressor runs dry, which leads to overheating of the windings and interturn short circuit. In 80% of cases, this ends with replacing the motor (the cost is 50-70% of the price of a new refrigerator).

5. Breakdown of the starting relay or compressor

If the compressor lights up, but does not start (clicks are heard, but the motor does not hum), the problem may be in the starting one. relay. This is a small box attached to the compressor, which is responsible for turning it on. If the relay malfunctions:

• 🔊 Sounds frequently. clicks (the relay tries to start the engine).
• 🔥 The compressor housing gets very hot (up to 90°C).
• ❌ The refrigerator does not cool, although the light inside is on.

In some cases, the relay can be repaired (for example, replacing the contacts), but more often it is replaced entirely. The cost of the part is from 800 to 2500 rubles per depending on the model.

If the compressor hums, but does not create pressure (for example, in refrigerators Stinol 101 or Birusa 130), this is a sign:

• 🔄 Interturn short circuit in windings.
• 🛠️ Wear of the piston group (typical for units older than 10 years).
• 💥 Seizing shaft (often after a voltage surge).

In such cases, the compressor must be replaced. The average service life of a motor is 10-15 years, but with proper care (cleaning, stable voltage) it can last 20 years.

6. External factors: voltage, temperature, ventilation

Sometimes the compressor burns not because of a breakdown, but because of external conditions. It’s easy to check:

• 🌡️ Room temperature: if the room is hotter +30°C, the refrigerator is working at its maximum capacity. The norm for most models is +16...+32°C.
• ⚡ Network voltage: when jumping lower 190V or higher 240V the compressor may not turn off or overheat. Use a stabilizer!
• 🪟 Direct solar rays: if the refrigerator is located near a window, its body heats up, and the motor is forced to compensate for this.

Solution:

• Move the refrigerator away from the stove, battery or window (at least 50 cm).
• Connect via voltage stabilizer (for example, Resanta ASN-1000 N/1-C).
• Check the door seal - if it is worn out, warm air gets inside.

⚠️ Attention: in hot regions (for example, in the south of Russia), even working refrigerators can work longer than usual If the temperature in the chamber is kept at the same level +4...+6°C, This is fine.

7. Electronic failures: when the control board is to blame

In modern refrigerators (for example, LG DoorCooling+ or Samsung Family Hub) for the operation of the compressor the electronic board responds. If it fails, the motor can:

• 🔄 Turn on for 1-2 seconds and turn off (the cycle is repeated constantly).
• ⏳ Work without stopping, ignoring sensor signals.
• 💻 Give errors on the display (for example, Er IF or E1).

Causes of failures:

• 🌩️ Power surge (even a single one can damage the microcircuits).
• 💧 Moisture getting on the board (for example, during defrosting).
• 🕷️ Short circuit due to dust or insects.

Solution:

1. Disconnect the refrigerator from the network for 10-15 minutes (sometimes a “reboot” helps).
2. If the error remains, check the code in the instructions (for example, Er DH v Samsung indicates a malfunction of the humidity sensor).
3. In case of critical failures (for example, the board is burnt), a replacement will be required (cost - 3000-8000 rubles).

What to do if the compressor is on: step by step algorithm

Before calling the technician, follow these steps:

1. Disconnect the refrigerator from the network for 1-2 hours. If after turning it on it worked in normal mode, the problem was overheating.
2. Check the temperature in the chambers +10°C and above, and in the freezer -10°C and below there may be a freon leak.
3. Inspect the condenser. If it is dirty, clean it (see checklist above).
4. Listen to the compressor:
   • It hums smoothly - there may be a leak or a thermostat malfunction.
   • It clicks, but does not start - the problem is relay.
   • It hums and heats up, but does not cool - the compressor itself is faulty.

Check the seal. Hold a sheet of paper to the closed door - if it falls out, the seal needs to be replaced.

If after After these actions, the compressor continues to burn, contact the service. The average cost of diagnostics is 500-1500 rubles, repairs - from 2000 rubles (relay replacement) to 10,000 rubles (compressor replacement).

FAQ: Frequently asked questions about a burning compressor

Is it possible to use a refrigerator if the compressor is constantly on fire?

Short-term (1-2 days) - yes, but the risk of overheating and breakdown increases every minute If the temperature in the chamber is kept normal. (+4...+6°C), you can wait for the technician. If the refrigerator does not cool, turn it off so as not to burn the compressor.

How long can the compressor operate normally?

Depending on the model and load:

• Summer, full load: before 20-25 minutes work and 30-40 minutes rest.
• Winter, half-empty refrigerator: before 10 minutes work and 1-2 hours rest.

If the compressor runs for more than 1 hour without a break, this is a reason for diagnosis.

Why new does the refrigerator work without stopping?

In the first 2-3 days after switching on, this is normal - the compressor adjusts the temperature mode. Also check:

• Is the mode turned on Super Freeze or Fast Cool.
• Is the refrigerator standing close to the wall (a gap of 5-10 is needed) cm).
• Is the freezer overloaded (in new models it cools first).

How to check if the compressor is working?

The simplest test:

1. Unplug the refrigerator.
2. Remove the starting relay (box on the compressor).
3. Connect the compressor directly to the network (without a relay!) for 1-2 seconds. If it hums, the motor is working, the problem is in the relay or board.

⚠️ Dangerous! Work only with the refrigerator disconnected from the network and in dielectric ones. gloves.

Is it worth repairing an old refrigerator if the compressor has burned out?

It is economically justified if:

• The refrigerator is less than 10 years old.
• The cost of repairs does not exceed 30-40% of the price of a new unit.
• The housing and seals are in good condition.

For models older than 15 years (for example, ZIL-63 or Minsk-15Mthe compressor is often replaced is not practical - it’s cheaper to buy a new one.