Why the motor in the refrigerator does not work: 10 reasons and solutions

Have you opened the refrigerator, and it’s warm inside, the light is on, but you can’t hear the characteristic hum of the motor? Or is the unit making strange sounds but not starting? Problems with the motor-compressor are one of the most common malfunctions that can lead to food spoilage and costly repairs. In 70% of cases, the breakdown can be diagnosed independently, without resorting to the help of a technician.

In this article we will analyze all possible causeswhy the motor in the refrigerator does not work - from a banal lack of power to serious compressor breakdowns. You will learn how to check the thermostat, relay, starting capacitor and other components, as well as when to call a specialist. Atlant, Indesit, Samsung or LG —diagnostic principles are the same for most models.

Important: if the refrigerator does not turn on at all (there is no light, the display does not work), the problem is most likely an electrical one - check the socket, plug and power cord. If there is light, but the motor is silent or hums without starting, read on.

1. Checking the power supply: why the refrigerator is “silent”

The first thing you need to exclude is lack of voltage on the network. Even if there is current in the outlet, the problem may lie in a faulty cord, plug or interference filter.

How to check:

• 🔌 Connect the refrigerator to another socket - sometimes the contacts in the old outlet burn out or weaken.
• 🔍 Inspect the power cord for kinks, melting or damage to the insulation. Pay special attention to the place where the cable enters the housing.
• 🔧 Check the plug: if it is collapsible, unscrew the cover and inspect the contacts for oxidation.
• 📊 Measure the voltage in the outlet with a multimeter - it should be in limits 220–240 V. Jumps or sags below 190 V can block the motor from starting.

If the refrigerator is connected via surge filter or extension cord, try turning it on directly. Cheap filters often cannot withstand the starting currents of the compressor (up to 10–15 A) and act as “protection”.

Does not turn on at all (no light)|Buzzes, but does not start|Works intermittently|Another option-->

⚠️ Attention: If you hear a crackling sound or see a spark at the outlet when you turn on the refrigerator, turn it off immediately! This is a sign of a short circuit in the plug or cord.

2. Malfunction of the thermostat or electronic control unit

The thermostat (or thermostat) is the “brain” of the refrigerator, which sends a signal to start the motor when the temperature rises. If it is broken, the compressor will not receive a command to turn on.

Signs of a malfunctioning thermostat:

• ❄️ The refrigerator does not cool, but the light inside is on.
• 🔄 The motor does not turn on regardless of the position of the thermostat knob.
• 🔊 When you rotate the thermostat knob, you do not hear a click (typical of mechanical models).

How to check the thermostat:

1. Unplug the refrigerator and remove the thermostat protective cover (usually located inside the chamber or on the top panel).
2. Find two wires going to thermostat, and connect them to each other (for example, a screwdriver with an insulated handle).
3. Plug in the refrigerator. If the motor works, the thermostat is faulty and requires replacement.

In refrigerators with electronic control (for example, Samsung No Frost or LG Inverter) a control board is used instead of a mechanical thermostat. Its diagnosis is more complicated - you will need a multimeter to check the output voltage. If the display shows error codes (for example, E1, FF), decipher them according to the instructions for the model.

Error codes for Samsung refrigerators

E1 - problem with the evaporator temperature sensor.

E2 - malfunction of the environmental sensor.

E3/E4 - errors in the freezer sensors.

FF - failure of the control board (reboot or replacement required).

⚠️ Attention: In refrigerators with a No Frost system, a malfunction of the defrost sensor can simulate a motor breakdown. If the fan works but the compressor does not, check the defrost sensor and timer.

3. Breakdown of the starting relay or capacitor

The starting relay and capacitor are the “starters” of the motor. The relay supplies current to the compressor windings, and the capacitor creates an additional impulse to start. If at least one of these elements fails, the motor will hum, but will not be able to spin up.

Symptoms of malfunction:

• 🔊 The refrigerator hums for 5-10 seconds, then clicks and turns off.
• 🔄 Repeated attempts to start every 2-3 minutes.
• 💥 Sometimes you can hear a popping or crackling noise from the relay area.

How to check:

1. Unplug the refrigerator and remove the start relay cover (usually attached to the compressor).
2. Inspect the capacitor: if it if it is swollen, leaking or has traces of burning, it needs to be replaced.
3. Test the capacitor with a multimeter in capacitance measurement mode. Normal value - 20–40 µF (exact data are indicated on the case).
4. Check the relay: shake it - if you hear the knock of broken parts, the relay is faulty.

V inverter refrigerators (for example, LG GA-B489 or Samsung RB37J5240) instead of a classic relay, inverter moduleis used. Its repair requires special equipment, so if you suspect a breakdown, it is better to contact the service.

Disconnect the refrigerator from the network

Remove the relay cover (usually attached to 1-2 screws)

Inspect the capacitor for swelling or leaks

Ring the capacitor with a multimeter

Shake the relay - there should be no extraneous sounds-->

4. Jamming or wear of the compressor

If the motor does not show signs of life (no buzzing, clicking), and all other elements are working properly, the problem may be in the compressor itself. The most common reasons:

• 🔧 Shaft jamming due to bearing wear or debris.
• 🔥 Interturn short circuit in the windings (the compressor heats up, but does not start).
• 💨 Loss of refrigerant (the motor runs, but does not create pressure).

How to diagnose:

1. Turn off the refrigerator and touch the compressor - if it hot, this may indicate a short circuit.
2. Try to manually rotate the compressor shaft (through a relay or a special hole). If it does not rotate, the motor is jammed.
3. Test the windings with a multimeter:
   • Resistance between contacts C–S (working winding) - 10–30 Ohm.
   • Resistance between C–R (start winding) - 30–50 Ohm.
   • Resistance between S–R - the sum of the two previous values.

If the resistance of the windings is 0 (short circuit) or infinity (break), the compressor must be replaced. In some cases the master can suggest rewinding the windings, but this is a temporary solution - the service life of such a motor rarely exceeds 1-2 years.

5. Refrigerant leak or clogged capillary tube

If the motor is running, but the refrigerator is not cooling, the reason may lie in loss of freon or a clogged system. Signs:

• ❄️ The compressor runs non-stop, but the temperature in the chambers does not drop.
• 🔥 The condenser (grid on the back wall) remains cold.
• 💧 There are oily stains on the floor under the refrigerator (a sign of oil leakage along with freon).

It is impossible to eliminate the leak or blockage on your own - you will need evacuating the system refilling the refrigerant. However, you can first diagnose the problem:

1. Turn off the refrigerator and inspect condenser (the grill on the back wall). If it is clean, but does not heat up, there is probably no freon.
2. Check capillary tube (thin copper tube in front of the evaporator). If it is icy only at the beginning, a blockage is possible.
3. Shine a flashlight on evaporator (in the freezer compartment). If it is unevenly covered with frost, this is a sign of a lack of refrigerant.

In refrigerators with a system No Frost freon leakage is often accompanied icing on the evaporator in the freezer compartment. If ice builds up on only one side, this is an indirect sign of loss of refrigerant.

⚠️ Attention: If you suspect a freon leak, do not try to refill the refrigerator yourself! Modern refrigerants (for example R600a or R134a) are explosive if mishandled.

6. Problems with the fan (for No Frost models)

In refrigerators with a system No Frost (for example, Bosch KGN39XL20 or Liebherr CNef 4815) the fan is responsible for air circulation. If it is broken, the motor can work, but the cold will not flow into the chambers.

Signs of a fan malfunction:

• 🌀 The motor works, but it is warm in the refrigerator compartment.
• 🔇 There is no air noise (normally there should be a slight whistle or rustle).
• ❄️ The evaporator is covered with ice (the fan cannot rotate).

How to check:

1. Unplug the refrigerator and remove the back panel in the freezer.
2. Try turning the fan blades by hand. If they do not rotate, the problem is in the bearings or icing.
3. Test the fan winding with a multimeter. The resistance should be within 200–500 Ohm.

If the fan is blocked by ice, defrost the refrigerator for 12–24 hours. If the problem repeats, the defrost sensor is faulty defrost sensor or defrost sensor timer.

7. Malfunctions of electronic boards

Modern refrigerators are equipped electronic control boardsthat control the operation of the motor, fans and sensors. During voltage surges or wear, the board may fail, which will lead to blocking of the compressor.

Symptoms of board malfunction:

• 📱 Are displayed error codes (for example, Er IF on Indesit or dH on Samsung).
• 🔄 The refrigerator turns on/off randomly.
• 🔌 The motor does not respond to commands from the control panel.

Independent repair of the board is almost impossible - it requires flashing or replacement of microcircuits. However, you can try to reset the errors:

1. Unplug the refrigerator for 10–15 minutes.
2. Turn it back on and press the combination of buttons to reset (for example, «Mode» + «Super Freeze» y Bosch).
3. If the error persists, contact service.

In refrigerators c inverter compressors (for example, LG GR-B207) the control board is especially sensitive to voltage surges. If your network has frequent surges, connect the refrigerator via voltage stabilizer.

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

Some malfunctions require professional intervention. Contact the service center if:

• 🔧 Motor jammed (does not rotate manually, gets hot, smells like burning).
• 💨 Yes freon leak (oily spots, lack of cold when the compressor is running).
• ⚡ Control board burned (visible damage, smell of burning plastic).
• 🔥 Refrigerator electric shock or sparks.
• 📉 After repair, the problem repeats within a month.

The cost of repair depends on the type of breakdown:

If the refrigerator is more than 10 years old, compare the cost of repairs with the price of a new unit. For example, replacing a compressor in Atlanta 2012 can cost 8-12 thousand rubles, which is comparable to the price of a budget new model.

⚠️ Attention: Parts for refrigerators older than 15 years are often in short supply. Check with the technician about the availability of spare parts before repairs.

FAQ: Frequently asked questions about a non-working refrigerator motor

The refrigerator does not turn on, but the light inside is on. What is the problem?

Most likely it is faulty thermostat or start relayCheck whether the voltage is reaching the compressor (test the circuit with a multimeter). controls.

The engine hums, but does not start. What should I do?

This is a typical sign of a malfunction starting capacitor or relay. Try replacing the capacitor (costs ~500 ₽). If that doesn’t help, check the compressor windings for breaks.

The refrigerator runs without stopping, but does not freeze?

Most likely freon leak or capillary tube cloggedAlso check whether the evaporator is iced up (for No Frostyou cannot fix the leak yourself - you need a master.

Is it possible to start a refrigerator without a relay?

No, this is dangerous! The relay protects the compressor from overheating and short circuits. Without it, the motor can burn out in a few minutes.

How much does it cost to replace a compressor? refrigerator?

The cost depends on the model:

• Budget refrigerators (Atlant, Biryusa) — 5 000–8 000 ₽.
• Middle class (Indesit, Bosch) — 8 000–12 000 ₽.
• Premium (Liebherr, Samsung s inverter) - 12,000–20,000 ₽.