The LG refrigerator hums or makes a lot of noise: all the reasons and solutions

Hum, vibration or unusual noise from the refrigerator LG is one of the most common user complaints. In most cases, this is not a critical failure, but the problem cannot be ignored: increased load on the components can lead to serious repairs. In this article we will look at 12 main causes of hum from a banal misalignment of the legs to compressor wear, and also give step-by-step instructions on how to diagnose and fix the problem yourself.

It is important to understand: the noise level of the refrigerator LG depends on model, cooling technology (No Frost, Smart Inverter) and even room temperature. For example, models with Linear Cooling are quieter than standard ones, but they may also produce extraneous sounds. If your refrigerator has always made the same noise, but now the noise has increased, this is a reason to check. If the noise appears suddenly, most likely the problem requires a prompt solution.

Before calling a technician, go through our checklist: perhaps the reason lies in little things that you can fix in 10 minutes. And if the problem is a technical malfunction, we will tell you how to save on repairs and not get scammed by service centers.

1. Is the noise level of your LG refrigerator normal?

The first thing to do is determine whether the hum is really an anomaly. All refrigerators LG have a passport noise level, which is indicated in the technical specifications. For example:

• 🔹 Models with Smart Inverter Compressor: 36–42 dB (almost silent, comparable to a whisper).
• 🔹 Standard compressor refrigerators: 40–45 dB (you can hear a background hum, like from a running computer).
• 🔹 Models with No Frost and a fan: up to 48 dB (may periodically “howl” when the fan is turned on).

If your refrigerator makes sounds within these values, most likely there is nothing to worry about. But there are signs that definitely indicate a malfunction:

• 🚨 A constant loud hum (over 50 dB), which does not subside even at night.
• 🚨 Metallic knocking or grinding - may indicate a breakdown of the compressor or fan.
• 🚨 Vibration of the casewhich is transmitted to the floor or furniture.
• 🚨 Cyclic clicks (every 5-10 seconds) - there may be a problem with the relay or thermostat.

To measure noise level, use free smartphone applications (for example, Decibel X or Sound Meter). Measure the sound at a distance of 1 meter from the refrigerator with the doors closed. If the readings exceed the passport values by 5-10 dB, it’s time to look for the cause.

2. Compressor: why it hums and how to check its operation

The compressor is the “heart” of the refrigerator, and its noise is most often confused with a breakdown. In fact a slight hum at startup (1-2 seconds) is normal: the engine is gaining momentum. But if the sound does not stop or becomes louder over time, the following problems are possible:

• 🔧 Wear of bearings —a uniform hum with vibration appears. More often found in refrigerators older than 7–10 years.
• 🔧 Overload due to high room temperature (above +30°C). The compressor operates at the limit, which increases the noise.
• 🔧 Malfunction of the start relay - accompanied by clicking and unstable operation of the motor.
• 🔧 Refrigerant leak - the compressor hums almost without interruption, trying to catch up cold.

How to check the compressor yourself:

1. Unplug the refrigerator for 5-10 minutes, then turn it on again. If the hum appears immediately and does not subside, the problem is in the motor.
2. Touch the compressor housing with your hand (it is located in the lower part at the back). Normally, it should be warm, but not hot. If the compressor burns your hand, this is a sign of critical overload, urgent repairs are required.
3. Listen to whether the tone of the hum changes when you open the door. If yes, the thermostat or temperature sensor may be faulty.

If the compressor is humming, but the refrigerator is not freezing, most likely there is a freon leak or the motor is jammed. In this case, independent repair is impossible - you need professional diagnostics with refrigerant refilling or replacement of the unit.

3. No Frost fan: when its noise becomes a problem

Refrigerators LG with the system No Frost are equipped with a fan that distributes cold air throughout the chambers. Normally, it makes a slight buzzing sound, but if you hear whistle, grinding or knockingmost likely the blades are touching the ice or the housing.

The main causes of fan noise:

To check fan:

1. Unplug the refrigerator.
2. Open the back panel in the freezer (usually it is secured with latches or screws).
3. Try turning the fan blades by hand. If they do not rotate or touch the ice, defrosting is required.

If the noise does not disappear after defrosting, the fan may have failed. In this case, it needs to be replaced - it is difficult to do this yourself, since it requires disassembling the freezer compartment and access to electrical contacts.

What will happen if you ignore the noise of the fan?

If the problem is not corrected, the fan blades may break, and icing of the evaporator will lead to overheating of the compressor. In the worst case, the refrigerator will stop freezing, and expensive repairs will be required with the replacement of several components.

4. Condenser and radiator: why they vibrate and hum

The condenser (grid on the back wall of the refrigerator) and the radiator are responsible for removing heat. If they are dirty or deformed, this may cause additional noise and vibration. Most often, the problem arises due to:

• 🧹 Accumulations of dust and dirt —heat transfer deteriorates, the compressor runs longer and louder.
• 🔨 Damage to the grille (for example, during transportation)—vibrating plates make a rattling sound.
• 🔥 Overheating —if the refrigerator is standing close to the wall or furniture, the air does not circulate and the radiator begins to “hum.”

How to fix the problem:

1. Disconnect the refrigerator and move it away from the wall.
2. Clean the condenser from dust using a vacuum cleaner or soft brush. Do not use sharp objects - you can damage the freon tubes!
3. Check whether the grille is touching the back wall or furniture. If so, carefully bend the plates with pliers.
4. Make sure that there is enough space around the refrigerator: at least 5 cm on the sides and 10 cm on the back.

If the hum does not go away after cleaning, there may be a problem in condenser fan malfunctions (available in some models LG with forced cooling). In this case, diagnostics will be required at a service center.

5. Incorrect installation: misalignment, vibration and external factors

Often the cause of the hum is not a breakdown, but improper installation of the refrigerator. Even a slight misalignment can cause vibration, which increases when the compressor operates. Check the following points:

• 📏 Floor levelness —if the refrigerator is on an uneven surface, it will “walk” when vibrating.
• 🔩 Adjusting the legs —if they are not adjusted, the case may touch the furniture or wall.
• 🧲 Contact with other objects - pipes, furniture or walls can resonate and increase noise.
• 🔌 Quality sockets - if the voltage is unstable, the compressor works intermittently, which causes a hum.

How to fix:

1. Use a building level to check the levelness of the installation. The refrigerator must stand strictly vertically.
2. Adjust the front and rear legs using a wrench. They should fit snugly to the floor, but not deform the body.
3. Make sure that the refrigerator does not touch walls or furniture. The optimal distance is 5–10 cm on all sides.
4. Connect the refrigerator to another outlet or use a voltage stabilizer if there are frequent surges in the network.

If after these manipulations the hum remains, check to see if a foreign object has gotten into the compressor or fan (for example, a piece of cling film or a jar lid). To do this, turn off the refrigerator and carefully inspect the accessible components.

6. Additional reasons for the hum: from the thermostat to the electronics

If you have ruled out all of the above reasons, but the refrigerator LG is still humming, the problem may lie in less obvious components:

• 🔄 Thermostat malfunction - if the temperature sensor does not work correctly, the compressor turns on too often, which causes cyclic hum.
• ⚡ Problems with the control board —failures in the electronics can lead to incorrect operation of the fans or compressor.
• 🧊 Clogged capillary tube —freon circulation deteriorates, the compressor runs at wear.
• 🔋 Wear of the door seal —if the rubber gasket is torn or deformed, the refrigerator loses cold and the compressor is forced to work longer.

Diagnosis of these problems requires special tools, so it is better to contact a service center. However, some signs can be identified on your own:

• If the refrigerator does not turn off (works 24/7) - most likely the problem is in the thermostat or freon leak.
• If appears on the display errors (codes Er, IF, dH) —the control board or sensors are faulty.
• If the freezer compartment freezes foodand the refrigerator does not cool, there may be a blockage in the system.

For models LG with a display, you can try resetting the settings to factory settings. To do this:

1. Unplug the refrigerator for 1 minute.
2. Turn on and immediately press the "Freezer" + "Fridge" (or "Ice+" + "Lighting" buttons depending on the model) for 5 seconds.
3. Wait for the sound signal - this is confirmation of the reset.

If the hum does not disappear after the reset, contact a specialist. Repairing electronics yourself without experience can lead to even more serious damage.

7. When to call a technician: signs of serious breakdowns

Some faults cannot be fixed on your own. Contact the service center LGif:

• ⚠️ Refrigerator does not freeze, but the compressor hums without stopping.
• ⚠️ burning smell or smoke appeared from under the rear panel.
• ⚠️ On the body or floor under the refrigerator appeared oil (a sign of a leak from the compressor).
• ⚠️ The display shows errors that are not reset (for example, Er FF, Er dH).
• ⚠️ A hum is accompanied strong vibration, which is transmitted to furniture or walls.

When choosing a service center, pay attention to the following points:

• 🔧 Official status (check on the website LG by certificate number).
• 💰 Cost of diagnostics (on average 1,500–2,500 rubles, but some centers do it free of charge for further repairs).
• ⏱️ Repair time (replacing a compressor or circuit board takes 1-3 days, refilling freon - up to 5 days).
• 📋 Warranty on work (must be at least 1 year).

The cost of repairs depends on the model and type of breakdown:

If your refrigerator is under warranty, do not try to repair it yourself - this will void the warranty. Contact an authorized service center. LG with receipt and warranty card.

8. Prevention: how to extend the life of your LG refrigerator and avoid humming.

To ensure that the refrigerator operates quietly and without failures, follow these recommendations: LG worked quietly and without failures, follow these recommendations:

• 🧼 Defrosting - even models with No Frost need to be defrosted 1-2 times a year. This prevents the fan from icing up.
• 🧹 Cleaning the condenser - remove dust from the back. grilles every 3-4 months.
• 📏 Correct installation —the refrigerator should stand level, with a gap from the walls of at least 5 cm.
• 🔌 Stable voltage —use a surge protector or stabilizer if your network has frequent surges.
• 🚪 Seal control —wipe the rubber gasket with soapy water and check its integrity.
• 🍎 Proper storage of food —do not put hot foods in the refrigerator and do not overload shelves.

Also pay attention to operating mode:

• In the hot season, increase the temperature in the refrigerator compartment by 1–2°C (for example, from +4°C to +5°C). compressor.
• If the refrigerator is not used for a long time (for example, at the dacha in winter), unplug it, rinse it and leave the door ajar.

Following these rules will help avoid 90% of noise problems and extend the life of the refrigerator by 3-5 years.

FAQ: Frequently asked questions about the hum of LG refrigerators

❓ The LG refrigerator began to hum loudly after moving. What's wrong?

Most likely, it happened during transportation deformation of tubes or displacement of the compressor. Turn off the refrigerator for 12 hours so that the oil in the compressor drains, then turn it on again. If the hum remains, call a technician to check the fastenings and integrity of the system.

❓ Is it normal for a new LG refrigerator to hum during the first days?

Yes, this is normal. desired temperature. If the hum does not subside after a week, check the installation and contact the store (possible factory defect). enhanced modeto reach the desired temperature. If the hum does not subside after a week, check the installation and contact the store (there may be a manufacturing defect).

❓ Is it possible to replace the compressor in an LG refrigerator yourself?

Technically it is possible, but highly not recommended. Replacing the compressor requires:

• Special equipment for evacuation of the system.
• Knowledge of the connection diagram (the connectors are different in different LG models).
• Refilling freon (if an error occurs, the refrigerator will come out of service) building).

If you are not a master, entrust this work to professionals.

❓ Why does the LG refrigerator hum at night, but is quiet during the day?

This is due to two factors:

1. Room temperature - at night it is lower, and the compressor turns on less often, but runs longer (hence the hum).
2. Silence in the house — during the day the noise is masked by household sounds, and at night it becomes more noticeable.

Check whether the refrigerator is located next to the radiator or in the kitchen with poor ventilation. If the problem is only in perception, try using soundproofing mat under the legs.

❓ How much does it cost to diagnose hum in an LG service center?

Cost of diagnostics in official services LG in 2026:

• Basic check (without disassembly) - 1 500–2 000 ₽.
• Full diagnostics with disassembly - 2 500–3 500 ₽.
• Travel of a technician to your home - from 1,000 ₽ (depending on the region).

Some centers do diagnostics for free if you agree to have them repaired. Check this in advance.