Owners of modern household appliances are often faced with a situation when a favorite LG DoorCooling+ or classic model begins to make extraneous sounds that were not there before. Hum, vibration, clicks or loud humming can seriously disturb the comfort of living, especially in small apartments where the kitchen is combined with the living room. Understanding the nature of noise is the first and most important step to solving the problem without calling a specialist.
The brand's refrigeration equipment LG is famous for its reliability and the use of inverter technologies, which theoretically should operate almost silently. However, physical laws and wear and tear of parts have not been canceled. The hum can be caused either by a banal misalignment of the housing or by a serious malfunction in the refrigerant circulation system. It is important to learn to distinguish between normal operating noise and a signal of a breakdown.
In this article we will analyze in detail all the possible reasons why your unit is humming, and we will offer an algorithm of actions for diagnosis. You will learn how to distinguish the sound of a running compressor from the vibration of a fan and in which cases immediate specialist intervention is required.
Normal operating noise or a sign of malfunction
Before you panic, it is worth determining the nature of the sound. Modern models, such as LG No Frost, are equipped with a complex ventilation and automatic defrosting system, which creates a background acoustic background. A quiet hum, periodic gurgling or rare relay clicks are often the norm for a working device. Inverter compressor, unlike old linear analogues, it does not turn off completely, but only changes the power, so a quiet, even hum is present almost constantly.
However, if the sound becomes intrusive, loud or changes its tone to grinding and knocking, this is an alarming signal. A sharp change in the usual acoustic profile of the refrigerator is the main indicator of an incipient malfunction. It is important to listen to where exactly the sound is coming from: from above, from behind or from inside the camera. Localization of the source often suggests which unit has failed.
You should not ignore new sounds that appear immediately after installation or transportation. In such cases, the problem often lies not in a breakdown, but in incorrect installation. Vibration from the compressor is transmitted to the housing and resonates with surfaces, creating a strong humming effect.
⚠️ Attention: If the humming is accompanied by a lack of cold in the chambers or an error appears on the display, operation must be stopped until the reasons are clarified.
For an initial assessment of the situation, it is useful to know the main sources of sound in technology. LG. Usually this is:
- 🔊 Operating compressor (normal humming).
- 💨 Rotation of the fan blades.
- 💧 Flow of refrigerant through the tubes.
- ⚡ Thermostat clicks or starting relay.
Installation problems and external factors
One of the most common reasons why a refrigerator hums LGis a banal violation of installation rules. If the body is not level, the vibration from the running motor is transmitted to the floor and walls, increasing significantly. Even the slightest misalignment can cause the internal frame to touch external walls or decorative panels.
Check the distance to walls and furniture. The rear condenser grille requires free space for air circulation. If the refrigerator is moved close to the wall, the flow of hot air does not escape, the motor overheats and begins to work more intensely, producing a louder hum. Gap between the back wall and the surface should be at least 5-7 centimeters.
It is also worth paying attention to the objects located nearby. Light kitchen utensils placed on the lid or side shelves may resonate with the vibration frequency of the compressor. Remove all foreign objects and check whether adjacent cabinets are touching the cabinet walls. Sometimes it is enough just to move the unit or align the adjusting feet.
For correct installation, follow these steps:
- 📏 Use a building level to check the horizontal position.
- 🔧 Tighten the front adjustable supports.
- 🚶 Move the equipment away from the wall by 10 cm.
- 🧹 Remove all objects from the top cover.
Faults of the compressor and start relay
The heart of any refrigerator is the compressor. Models LG often use inverter motors Linear Inverterwhich are characterized by quiet operation. However, if you hear a loud, increasing hum that turns into a roar, or metallic knocking, the problem may be in the mechanical part of the engine. Wear of the bearings or valve group leads to the fact that the piston begins to hit the cylinder walls.
Another source of noise is starting relay. This small element is responsible for starting the engine. If the relay is faulty, it may make a loud clicking or buzzing noise as it tries to start the compressor but fails to do so. In such cases, the motor may hum for several seconds, and then suddenly stop talking with a characteristic click - this is when thermal protection is triggered.
Diagnostics of the compressor requires caution. If you hear the motor running hard, having difficulty starting and making a low-frequency hum, this may indicate a winding shorted between turns or a loss of compression. In such situations, replacing a part is often not economically feasible compared to the cost of a new unit, especially when it comes to older models.
How to check the compressor without tools?
Plug in the refrigerator. After 10-15 seconds, carefully (so as not to get burned) touch the side surface of the motor. If it vibrates evenly and the hum is even, the mechanics are most likely in order. If the vibration is jerky or the motor gets hot in seconds, a technician needs to diagnose it.
Fan noise in the No Frost system
Refrigerators LG No Frost are equipped with a forced air circulation system, for which the fan is responsible. If you hear a whistling, crackling or intermittent hum coming from the depths of the freezer or refrigerator compartment, the problem most likely lies in this unit. The fan blades may touch frozen ice or a foreign object.
Often the cause is freezing of the air duct damper or freezing of ice on the evaporator. Moisture from the products evaporates, enters the cooling zone and crystallizes. When the layer of ice becomes too thick, it begins to interfere with the rotation of the blades. The fan motor tries to turn them, but encounters resistance, which causes a characteristic humming sound.
In some cases, the fan motor itself fails. The hub bearings dry out and the axle begins to rotate misaligned, creating vibration and noise. Replacing the fan is not a complicated procedure, but it requires partial disassembly of the internal panel of the camera. It is important to choose an original spare part LG, since non-original analogues may have different noise characteristics.
Vibration and rattling of internal elements
Sometimes the source of noise is inside the cameras and is not associated with technical components. Rattling of glass shelves, plastic containers or bottles touching each other can create the illusion of serious damage. Vibration from a running compressor is transmitted to the entire volume of the refrigerator, causing loose objects to move.
Check the fastening of the shelves. If the glass shelf is loose or its plastic stops are dry, it will rattle. It is also worth inspecting the egg trays and containers in the door. Empty plastic containers are especially prone to resonance. It is enough to rearrange the products or place a soft pad under the shelf to eliminate noise.
Pay special attention to the melt water drainage system. If the drain hole or tray located above the compressor (on some models) vibrates, it makes a ringing metallic sound. Check whether the tube coming from the compressor is loose and whether the condensate collection container is securely fastened.
☑️ Diagnostics of internal noise
Noise diagnostic table
To simplify troubleshooting, use the following table. It will help compare the audible sound with the probable cause.
| Sound type | Probable cause | Urgency of repair |
|---|---|---|
| Smooth quiet humming | Normal operation inverter compressor | Not required |
| Loud hum turning into roar | Wear of the compressor or lack of clearance at the wall | Average |
| Crackling and grinding from cameras | The fan touches the ice or is faulty | High |
| Loud clicks and buzzing for 3-5 seconds | Faulty start relay | High |
| Gurgling and overflow | Freon circulation (Normal) | Not required |
Analysis of the table shows that not all sounds require intervention. However, if you hear grinding or loud clicking noises, don't hesitate. Prolonged operation of the engine in the "start-stop" mode due to a faulty relay can lead to combustion of the compressor windings, which is an expensive breakdown.
When you need to call a technician
There are a number of situations when self-repair not only will not help, but can also cause harm. If, after leveling the refrigerator and checking the internal shelves, the humming noise does not stop, and the nature of the sound indicates a mechanical failure, a professional diagnosis is required. This is especially true when noise is accompanied by an increase in temperature in the chambers.
A master is needed if:
- 🛠️ The compressor hums, but does not start (protection is triggered).
- 🔥 The motor gets very hot (more than 90 degrees).
- ❄️ The cold in the chambers has disappeared, but the motor is working.
- 💧 Traces of oil have appeared under the refrigerator.
The specialist will measure the pressure in the system, check the current consumption of the engine and the integrity of the electrical circuits. Repairing a compressor group requires special tools and skills, so trying to open a sealed circuit yourself is strictly not recommended.
⚠️ Attention: Opening the compressor housing or breaking the tightness of the system without a license and equipment is prohibited and dangerous to health.
Prevention and care of the LG refrigerator
To avoid the appearance of extraneous noise in the future, it is important to regularly service the equipment. At least once a year, it is recommended to completely defrost the refrigerator (even the No Frost system), disconnecting it from the network for 12-24 hours. This will remove ice plugs in hard-to-reach places that may interfere with fan operation.
Regularly wipe the rear condenser grill to remove dust. A grate clogged with dust impairs heat transfer, forcing the compressor to operate at higher speeds, which increases noise levels and energy consumption. Also, keep the door seals clean - a loose fit leads to moisture ingress and freezing.
Proper operation prolongs the life of the unit. Do not place hot foods inside, do not overcrowd shelves, and make sure the refrigerator is on a level, solid base. Following these simple rules will allow you to enjoy silence and fresh food for many years.
How often should you wash the condenser?
The optimal frequency of cleaning the rear grille from dust is once every 6 months. This can be done with a vacuum cleaner with a soft attachment or a dry brush.
Why does the new LG refrigerator hum loudly in the first days?
New units often work more intensely during the break-in period. In addition, the seals have not yet been ground in, and the internal parts have not been developed. If the hum is uniform and is not accompanied by vibration of the body, this is normal. After 1-2 weeks, the noise level should decrease.
Is it possible to replace the compressor yourself?
Theoretically it is possible, but this requires a vacuum pump, a pressure gauge station, a burner and skills in soldering copper pipes. In addition, precise charging with freon of a certain type and weight is necessary. Without experience, there is a high risk of completely ruining the equipment.
Does the temperature in the room affect the noise of the refrigerator?
Yes, in a hot room (above +30°C) it is more difficult for the refrigerator to give off heat. The compressor is forced to work longer and at higher speeds, which increases the noise level. In a cold room, appliances operate more quietly and more economically.
What to do if the refrigerator hums only at night?
At night, the general background of silence in the apartment decreases, and the sounds of appliances become more audible. Also, at night, the voltage in the network may drop, which causes the motor to operate less stably. Check the socket and try to turn on the unit through the surge protector.