Owners of premium and mid-segment household appliances are often faced with a situation where, after purchase or after some time of operation, LG refrigerator begins to make an obsessive hum. Instead of quiet, almost imperceptible operation, the unit fills the kitchen with a low-frequency hum, which can intensify at night. This phenomenon causes natural concern, since extraneous noise is often associated with the breakdown of expensive components or a violation of the tightness of the system.
However, do not panic ahead of time. Modern models, such as LG DoorCooling+ or series with technology Total No Frosthave a complex design where air circulation and the operation of an inverter compressor can create specific sound effects. It is important to understand that not every sound indicates a critical malfunction. Sometimes it is enough just to adjust the position of the housing or defrost the system so that silence returns to the house.
In this article we will analyze in detail the mechanics of noise, from natural physical processes to serious technical defects. You will learn to distinguish between a normal working hum and a sound that requires the intervention of a specialist. We will consider vibration of panelsproblems with fans and operating features refrigerant in the evaporator tubes.
Natural sounds of an inverter compressor
The first thing that owners of LG equipment need to consider is the widespread use of inverter compressors Linear Inverter. Unlike older linear models that operated on an on-off basis, an inverter motor maintains temperature by constantly changing the speed. It is this process that is often accompanied by a monotonous hum, which can either subside or intensify.
The sound of a working piston inside a sealed casing can be heard quite clearly, especially in silence. If your refrigerator is installed in a niche or close to the wall, the acoustic effect is enhanced due to resonance. A smooth, low-frequency hum without sudden changes in tone, knocking or clanging. The intensity of the sound directly depends on the load: the more products you put inside or the higher the temperature in the room, the more active the motor is.
It is also worth noting that in models with the system No Frost the compressor can operate almost continuously, maintaining the specified mode. This is not a defect. If the hum is uniform and is not accompanied by vibration of the housing, which can be felt by touching the side wall, then, most likely, the equipment is functioning normally.
⚠️ Attention: If the hum of the compressor suddenly changes to a loud metallic clang or the sound of metal on metal is heard, immediately unplug the device. This is a sign of destruction of the motor suspension or jamming of the piston group.
Inverter systems are sensitive to voltage drops. An unstable network can cause humming from the transformer or the motor itself. To protect expensive LG equipment, it is strongly recommended to use a voltage stabilizer or surge protector with surge protection.
How to distinguish new sound from old?
Compare the nature of the noise with the first days of operation. If the timbre of the compressor's voice has changed dramatically (whistle or howl has appeared), this is a reason for diagnosis, even if the refrigerator continues to cool.
Vibration of the body and incorrect installation
Often the source of the annoying hum is not the internal “filling”, but the body of the refrigerator itself, which begins to resonate. LG produces equipment with large areas of metal panels, which, if insufficiently damped, turn into speakers. The main reason is incorrect installation of the unit relative to the horizontal plane.
If the legs of the refrigerator are not adjusted, the body warps, which leads to uneven distribution of the load on the compressor. The result is vibration that is transmitted to the floor and walls. To eliminate this problem, you need to equip yourself with a building level and a wrench to adjust the support legs. Rotating the supports, achieve a strictly horizontal position, then check the stability by lightly rocking.
☑️ Diagnosis of vibration of the body
The second important point is the gap between the back wall of the refrigerator and the wall of the room. The instructions for LG models usually indicate a minimum distance of 5-10 cm. If the refrigerator is standing close, the vibration from the motor is transmitted directly to the wall, which begins to hum. Move the equipment aside and make sure that the condenser grille at the back does not touch any objects.
It is also worth checking the shipping bolts if they were not removed during installation (although modern LGs usually do not have them, but the fixing elements may remain). Inspect the area around the compressor: sometimes plastic clamps or tubes may touch the motor casing, creating rattling noise during operation.
If the floor at the installation site is uneven or slippery (tiles, linoleum), the vibration will increase. In such cases, special anti-vibration pads made of dense rubber can be placed under the support legs, which dampen vibrations and reduce the noise level.
Problems with the ventilation system and fans
The system No Frost and multi-stream DoorCooling+ are impossible without powerful fans that circulate cold air inside the chambers. Over time, the lubricant dries out in the bearings of fan motors, or an ice crust builds up on the blades, which leads to imbalance and the appearance of a hum. The sound in this case usually has a characteristic whistling or howling tone.
In the freezer, the evaporator fan most often fails. If you hear a humming noise that comes and goes (especially after opening the door when the fan should be stopped by the sensor), this is likely the problem. Ice can block the blades, causing the motor to overload. In this case, the refrigerator must be completely defrosted within 24 hours.
- 🌀 Whistling sound —a sign of bearing wear or lack of lubrication in the fan motor.
- 🧊 Crackling and buzzing —the blades touch ice or a foreign object (crumbs of ice, a piece of packaging).
- 💨 Wind noise —clogging of the air channels with food or dust, which creates aerodynamic noise.
In some LG models, the fans are located in the upper part of the refrigerator compartment (under the ceiling). Getting to them is more difficult, but the diagnostic principle is the same: if after defrosting the noise returns after a few days, it means that the door seal is broken or the defrost sensor is faulty, and the ice is growing too quickly.
Replacing a fan is a procedure that requires care. It is necessary to remove the internal panel, disconnect the terminals and install a new part. It is important to use original components or high-quality analogues, since cheap fans can make even more noise than the original.
Sounds of refrigerant circulation and defrosting
The movement of freon through the system pipes is a physical process, which is often accompanied by sounds similar to gurgling, hissing or a quiet hum. This is especially noticeable in refrigerators with two cooling circuits or at the moment the compressor starts, when the pressure in the system changes sharply. Liquid refrigerant, boiling in the evaporator, produces characteristic sounds that can frighten inexperienced users.
However, if the humming is accompanied by strong heating of the side walls and does not stop for a long time, this may indicate a clogged capillary tube or the presence of air in the system. In such cases, the compressor works at its limit, trying to push the refrigerant through the obstacle, which creates a constant intense hum.
| Sound type | Probable cause | Need for repair |
|---|---|---|
| Quiet gurgling | Normal circulation of freon | No |
| Loud hissing | Freon leak or blockage | High |
| Humming + knocking | Hydraulic shock in the compressor | Medium/High |
| Whistling when starting | Problem with the start relay | Average |
It is also worth mentioning the automatic defrosting system. Periodically (usually once every 8-12 hours) the defrosting heating element is turned on, and the accumulated ice begins to melt. Dripping water may hiss as it hits the hot pan, or flow down the drain tube with a characteristic sound. If the drain is clogged, water may accumulate and create noise as it evaporates.
⚠️ Warning: If you smell a burning smell along with unusual humming and hissing noises, turn off the refrigerator immediately. This may be a sign of a refrigerant leak (although it is usually odorless, the oil in the compressor may burn) or melted wiring.
The influence of foreign objects and loading
Sometimes the reason is trivial: it is not the refrigerator itself that is humming, but what is inside it or nearby. Glass shelves, if they do not sit tightly in the grooves, may vibrate due to the operation of the compressor. Plastic containers stacked on top of each other can also resonate and create an unpleasant sound background.
Check the contents of the door shelves. Bottles with liquid touching each other or the walls of the cell may ring. Make sure all products are securely secured. Pay special attention to metal utensils - they resonate well and enhance any vibrations.
Also check the space around the refrigerator. A microwave oven nearby, empty cans on a shelf above the refrigerator, or even a picture on the wall can begin to vibrate from the low-frequency waves that the unit generates. Carry out a simple test: with the humming refrigerator running, press various objects around with your hand. If the noise disappears, the source has been found.
It is important to correctly distribute the products inside. If you load one of the shelves with heavy objects to capacity, this can cause distortion and additional vibration of the entire structure. Try not to place heavy pots on the edge of the glass shelf.
Diagnostics of compressor and electrical faults
If all the previous points are excluded, and the LG refrigerator continues to hum, the problem may lie in a malfunction of itself compressor or its control elements. Inverter motors are controlled by sophisticated electronics. If the control board produces incorrect signals, the motor may operate in abnormal mode, producing a howling sound.
Another common reason is wear of the shock absorbers on which the compressor is suspended inside the casing. Over time, the rubber dries out, and the motor begins to touch the walls of the casing, transmitting vibration to the entire body of the refrigerator. In this case, the shock absorbers need to be replaced, which is a standard repair procedure.
The start relay can also be a source of problems. If it is stuck or not working properly, the compressor may hum but not start, or may start with a loud clicking and humming noise. This condition is dangerous due to overheating of the motor windings.
FAQ: Frequently asked questions
Why does a new LG refrigerator hum loudly in the first days?
A new refrigerator may hum louder due to the fact that the parts have not yet gotten used to it, and the door seals are very hard. Also make sure you have removed all shipping locks. Usually, after 3-5 days of operation, the noise level decreases to the passport values.
Can a refrigerator hum if there is no food in it?
Yes, it can. An empty refrigerator operates at a more irregular rhythm, turning on and off more often (if it is not an inverter). In addition, the absence of heat storage products leads to faster heating of the air when the door is opened, which forces the compressor to work harder.
Does the LG refrigerator hum more in the "Super Freeze" mode?
Yes, in this mode the compressor and fans work at maximum power continuously to quickly lower the temperature. This is normal behavior, and after the cycle is completed (or the mode is turned off manually), the noise should decrease.
What should you do if the humming noise appears after defrosting?
If a new sound appears after defrosting, check to see if water has entered the electrical parts or the back wall. It is also possible that the ice plug in the drain has melted and you are hearing the sound of water running down. If the motor is humming, let the refrigerator stand turned off for several hours; it may take time to equalize the pressure in the system.