Modern household appliances of the brand LG are famous for their reliability and thoughtful design, however, even the highest quality equipment can make extraneous sounds over time. If your refrigerator begins to hum, whistle or make gurgling sounds, this does not always mean a critical breakdown. Often the source of noise lies in improper installation or natural processes of the system No Frost.
However, changes in the acoustic background cannot be ignored. Constant hum may signal problems with the compressor, clogged capillary tube or fan failure. Owners of models with an inverter compressor, such as series DoorCooling+ or Multi Air Flow, should be especially attentive to the nature of the sound, since these units operate almost silently in good condition.
In this article we will analyze in detail the physics of the occurrence of various noises and will help you determine whether you can fix the problem yourself or whether it’s time to call a specialist. Understanding the nature of sound is the first step to saving food and budget.
Natural sounds of refrigeration equipment
Many users first encounter a “new” sound immediately after purchasing or defrosting the equipment. It is important to distinguish between normal functioning and symptoms. In modern models LG with the system Total No Frost air circulation is forced, which creates a constant but quiet background noise.
Periodic crackling or clicking is often associated with thermal expansion of the plastic of the inner box or metal elements of the evaporator. When the temperature changes suddenly, materials expand or contract, producing characteristic sounds similar to wood cracking or clicking. This is absolutely normal and does not require intervention.
The sound of flowing refrigerant is also considered normal. Freon, moving through the tubes of the condenser and evaporator, can gurgle, hiss or gurgle. This is especially audible immediately after the compressor is turned off, when the pressure in the system equalizes. If the sound is not accompanied by vibration of the housing or an increase in temperature in the chambers, there is no need to worry.
- 🔊 The quiet hum of the compressor is a sign of the motor working, the level depends on the model.
- 💧 Gurgling and hissing is the movement of freon through the pipeline system.
- 🔥 Cracking of plastic - thermal expansion of materials when temperature changes.
- 🌀 Fan noise - air circulation in the No Frost system.
⚠️ Attention: If a quiet hum suddenly gives way to a loud rumble or metallic clang, immediately unplug the device and check the fastenings.
Problems with installation and vibration of the case
The most commonplace, but common reason that the refrigerator LG buzzes a lot is a violation of the installation rules. Vibration from a running compressor is transmitted to the floor and walls if the device is unstable. Even a slight tilt can cause resonance, which increases the noise significantly.
Check the horizontal installation using a building level. The legs of the refrigerator should touch the floor surface firmly and evenly. If the floor is uneven, adjust the height of the support screws. The gap between the back of the refrigerator and the wall should be at least 5-7 cm for free air circulation.
Another source of vibration is internal elements. Check that bottles or cans are not touching the walls of the chamber or each other. Sometimes rattling is caused by a poorly secured shelf or egg tray. Make sure that the transport bolts (if they were present upon delivery) are completely removed from the compressor.
☑️ Vibration diagnostics
If the hum remains after leveling, try placing special anti-vibration pads under the legs. This will help dampen resonant frequencies, especially if the refrigerator is installed on a wooden floor or linoleum.
Compressor malfunctions: diagnostics by sound
The heart of any refrigerator is the compressor. Models LG most often use inverter motors, which should operate smoothly, without sudden starts and stops. If you hear a loud, increasing hum that does not subside, the compressor may be operating in emergency mode or “at the limit.”
A dull, monotonous hum may indicate wear on the engine shaft bearings or a misalignment of the rotor. If the sound is intermittent, with a metallic clanging sound when starting, this may indicate a problem with the start relay or mechanical jamming of the piston group. In such cases do-it-yourself repair almost impossible and requires replacement of the unit.
Particular attention should be paid to the temperature of the compressor. If it hums and at the same time becomes red-hot (or so hot that it is impossible to touch), this is a sign of overload. This often happens when there is a freon leak when the motor tries to compensate for the lack of refrigerant by continuous operation.
- 🔨 Metallic knocking when starting is a problem with the starting relay or piston.
- 📉 A monotonous howl is wear on the bearings or motor windings.
- 🔥 Strong heating and hum - freon leak or contamination of the condenser.
- ⚡ Intermittent hum with clicks - malfunction of the control electronics.
⚠️ Attention: Attempting to repair the compressor yourself without special equipment (vacuum pump, pressure gauges) is dangerous and can lead to to the final failure of the equipment.
LG compressor life
Modern LG inverter compressors are designed for 10 years of uninterrupted operation. However, this period is relevant only if the network voltage is stable and the operating temperature conditions are observed. Voltage surges are the main enemy of electronics and motor windings.
Noise of the ventilation and defrosting system No Frost
In refrigerators LG with a system No Frost the fan is responsible for circulating cold air. If you hear a whistling, humming, or cracking sound coming from the top of the freezer (or from the panel on the back wall), this is most likely the problem.
Over time, ice or dust can accumulate on the fan blades and bearings. The ice crust interferes with free rotation, creating a characteristic buzzing sound. Dust collected in the bearing causes friction and whistling. In some cases, the blades may become deformed and touch the walls of the air duct.
For diagnostics, it is often necessary to remove the back panel in the freezer. If the fan is covered with frost, the defrost sensor or evaporator heating element may be faulty. The system does not warm up the evaporator, the ice does not melt and gradually “eats” the space, reaching the fan.
| Sound type | Probable cause | Elimination method |
|---|---|---|
| Whistling or squeaking | Drying of the grease in the bearing | Replace the fan or lubricate (temporary measure) |
| Crackling or knocking | Ice on the blades or deformation | Defrost (24 hours) or replacing the impeller |
| Humming when opening the door | Fan stops (normal) | Not required, this is normal mode |
| Constant noise | Dirty or wear motor | Cleaning or replacing the unit |
If the problem is icing, completely defrosting the refrigerator during the day is often enough to eliminate the noise. If the fan is worn out mechanically, it will need to be replaced with an original spare part LG.
The influence of an inverter compressor on acoustics
Refrigerators LG are often equipped with inverter compressors Linear Inverter. Their principle of operation differs from conventional ones: they do not turn off completely, but smoothly change power. This should make them quiet, but sometimes users hear a low-frequency hum that wasn't there before.
This hum may be related to the operation of the power control electronics. If the inverter board begins to produce incorrect signals, the compressor may not operate optimally, causing vibration in the windings. It is also worth checking the grounding: inverter motors are sensitive to the quality of the electrical network.
It is important to note that at low speeds, an inverter compressor can produce a sound similar to a purring cat or the quiet hum of a transformer. This is fine. The alarm should be sounded if the sound becomes shrill or is accompanied by failures to maintain temperature.
Dirty condenser and overheating of the system
The condenser (grid at the back or hidden in the walls) is responsible for releasing heat to the environment. If it is clogged with dust, animal hair or fluff, heat transfer is impaired. The pressure in the system increases, the compressor is forced to work with increased load, which causes a strong hum.
Check the back of the refrigerator. If you see a dense layer of dust between the coils of tubes or on the radiator grille, it needs to be cleaned. This must be done carefully so as not to damage the thin tubes and not to break the tightness of the system.
Use a vacuum cleaner with a soft attachment or a dry soft brush. Do not wet clean the appliance when it is turned on and beware of sharp objects. Cleaning the condenser is a simple procedure that will not only reduce noise, but also reduce energy consumption.
- 🌡️ Increased noise + hot sides are a sign of poor heat transfer.
- 🧹 It is recommended to clean the radiator every 6-12 months.
- 🐈 Pet hair clogs the grille the fastest.
⚠️ Attention: When cleaning the condenser, do not use pressurized water or aggressive chemicals. Damage to the tubes will lead to freon leakage and costly repairs.
Frequently asked questions and answers (FAQ)
Why does the LG refrigerator hum only at night?
At night, the overall noise level in the apartment decreases, and you simply begin to notice the normal sounds of the appliance. Also, the network voltage may drop at night, which causes the compressor to operate less stably. If the hum is very strong, check whether the refrigerator is located close to the wall.
Is it normal for the refrigerator to gurgle after defrosting?
Yes, this is absolutely normal. After defrosting, moisture may remain in the system, which during the first start-up actively circulates along with the refrigerant. It may also take several hours to reach the operating temperature.
Is it possible to lubricate the fan yourself if it whistles?
Theoretically, you can remove the sticker and drip oil, but in a refrigerator this is a temporary measure. The oil thickens in the cold, and the whistle will return. It’s better to order a new fan - it’s more reliable and safer.
Does the new LG refrigerator make a noise in the first days?
The new device may work a little noisier in the first 2-3 days, while the mechanisms are grinding in and the temperature conditions stabilize. Also make sure that you have removed all shipping materials and films.
What to do if the hum does not go away after cleaning?
If simple methods (leveling, cleaning, defrosting) did not help, the problem may be technical. The start relay may need to be replaced, compressor repaired, or electronics diagnostics may be required. In this case, it is better to contact an authorized service.