An unpleasant hum, a sudden knock or an obsessive gurgle - all this can turn the kitchen from a cozy place into a source of constant irritation. When the refrigerator is very noisy, this is not just discomfort, but also a signal that changes have occurred in the refrigerant circulation system or the operation of the electric motor. In some cases, extraneous sounds indicate normal processes, but often they indicate wear of parts or incorrect installation of the unit.
Before calling a technician or searching the Internet for repair methods, it is necessary to carry out an initial diagnosis. It is important to understand the nature of the sound: is the motor humming, is the body vibrating, or is there a sharp metallic clang. The further strategy of action depends on this. In this article, we will analyze in detail the main causes of noise and provide step-by-step instructions for eliminating them yourself.
Primary diagnosis: normal or faulty?
Modern models of refrigerators, especially with the system No Frost, emit a number of sounds that are absolutely normal for their functioning. Compressor during the compression process, freon can hum, and when pumping refrigerant, gurgling or liquid pouring can often be heard. This is a natural physical process that does not require intervention.
⚠️ Attention: If you hear a loud pop or cracking sound immediately after the compressor turns off, this may be a sign of a faulty start relay. In such a situation, use of the device should be stopped until it is checked by an electrician.
However, there are sounds that cannot be ignored. A sharp knock, metal grinding sound, or a growing hum that was not there before indicates a mechanical problem. Often the cause is vibration transmitted to the body or nearby objects. To accurately determine the source, try lightly pressing the side walls or top cover with your hand - if the noise subsides, the problem is vibration.
It is also important to take into account the age of the equipment. Older models with conventional drip defrosting operate differently than modern inverter units. If your refrigerator started to make more noise than usual after 5-7 years of service, most likely the rubber shock absorbers or engine bearings have worn out.
Installation problems and vibration housing
The most common and easily eliminated cause of noise is improper installation of the unit. If the refrigerator is not level, its body begins to resonate with the operation of the motor, increasing the hum several times. Even a slight tilt can cause the door to slam on its own and internal parts to rattle.
To fix this problem, you need to check the horizontal installation. Use a building level or simply visually assess the position of the unit. Adjustment is carried out using the front support legs, which can be twisted or unscrewed.
☑️ Checking the installation of the refrigerator
It is also worth paying attention to the distance to the wall. The rear grille of the condenser should not touch the wallpaper or furniture, otherwise the vibration will be transmitted to the structure of the house. The minimum distance to the back wall should be 5-7 cm.
⚠️ Attention: Do not install the refrigerator in a niche without gaps. For normal air circulation and noise reduction, free space is required on all sides, especially above and behind.
If the kitchen floor is slippery (for example, ceramic tiles or linoleum), the legs may move apart, causing misalignment. In this case, you can place special anti-vibration mats or pieces of thick rubber under the supports. This will help absorb vibration and make the operation of the equipment quieter.
Noise of the compressor and start relay
The heart of any refrigerator is the compressor. It is this that creates the main pressure in the system. If this unit becomes worn, it becomes louder, producing a low-frequency hum or growl. In older models, the starting relay often fails, which is accompanied by a loud click and an attempt to start, which may end in failure.
Inverter compressors, which are found in models Liebherr, Bosch or LG, work much quieter, since they do not turn off completely, but only change power. However, if such a compressor begins to make noise, this may indicate a serious electronic malfunction or mechanical failure inside the motor.
Symptoms of a compressor malfunction
If the compressor hums, but does not start, and after a while there is a click and the hum stops, the start relay is probably burned out or the piston is jammed. In this case, replacement of the part is required.
Checking the compressor requires caution. Make sure the unit is unplugged before touching the rear. If you hear a metallic knocking sound inside the engine, this may mean that the valves are broken or the piston rings are worn out. In this case, only replacing the unit will help.
Often the noise is caused not by the motor itself, but by the tubes coming from it. During operation, they may vibrate and hit each other or the housing. Gently bend the copper tubes by hand (only if they are not hot!) so that they do not touch other parts. This simple action often helps reduce the noise level without repair costs.
Fan and No Frost system
In refrigerators with a system No Frost fans are responsible for circulating cold air. Over time, ice can build up on the blades, or dust can get into the fan motor bearings, causing a characteristic noise. The sound may resemble plastic rubbing against plastic or a monotonous hum.
If the fan is frozen, the blades may touch a layer of frost. In this case, the refrigerator must be completely defrosted. Unplug the appliance and leave the doors open for at least 24 hours. This will allow the ice to melt and free up the fan.
In cases where defrosting did not help, the lubricant in the fan bearing may have dried out or it requires replacement. You can get to it by removing the back panel in the freezer. Be careful when removing plastic fasteners, as they become brittle in the cold.
It is also worth checking to see if the fan has moved out of place. If the fastenings are loose, it will hit the walls of the chamber, creating a loud noise. Fasten it securely using original screws or high-quality analogues.
Internal elements and rattling of dishes
Sometimes the source of noise is inside the refrigerator compartment. Glass shelves, plastic containers or bottles may resonate with the vibration of the compressor. One poorly placed glass is enough to create an unpleasant ringing while the engine is running.
Inspect the internal space. Make sure all shelves fit snugly and container doors are closed. If the shelf has rubber seals, check their integrity. or damage to the seals can lead to glass rattling.
| Element | Type of noise | Cause | Solution |
|---|---|---|---|
| Glass shelf | Ringing, rattling | Poor fixation in the grooves | Adjust the shelf, check the seals |
| Plastic box | Creak, knocking | Friction on the guides | Lubricate the guides or adjust the drawer |
| Bottles | Chime | Touching each other during vibration | Place more stable or use a holder |
| Egg tray | Knock | The lid does not fit tightly | Close the lid or fix the tray |
Pay special attention to the egg tray and door shelves. They may become dislodged when the door is opened and closed or when the compressor is started. If a plastic part is cracked, it will make an annoying sound with each cycle of operation.
When you need to call a technician
There are situations when self-repair is not only ineffective, but also dangerous. If you have tried all methods of leveling, defrosting and checking internal elements, but the refrigerator continues to make noisethe problem may lie deep in the system.
An alarming signal is a burning smell or a humming sound, which is accompanied by heating of the motor housing. This may indicate an interturn short circuit in the motor windings. Operating such a device may result in a fire.
⚠️ Attention: Do not attempt to disassemble the sealed circuit yourself or change the compressor without special equipment and skills. This requires evacuation of the system and charging with freon.
Also, the help of a specialist is needed if the noise is accompanied by a refrigerant leak. This may be indicated by the lack of cold when the engine is running. In this case, it is necessary to search for the leak, solder and refill the system.
Professional diagnostics will allow you to accurately determine whether the compressor, fan or simply cleaning the condenser needs to be replaced. Sometimes it is enough to replace the rubber shock absorbers to restore silence, but it is difficult to determine their wear without disassembling.
Noise prevention and care of equipment
For the refrigerator to operate quietly for many years, it must be properly cared for. Regular defrosting (for models without No Frost) prevents the formation of ice plugs that load the compressor. Cleaning the rear grille from dust also helps the motor not to overheat and operate normally.
Check the tightness of the screws and the condition of the legs every six months. Over time, they can unwind from constant vibration. Timely tightening of fasteners will save you from unnecessary rattling.
How to extend the life of a compressor
Do not place the refrigerator close to the wall, do not load it with hot foods, and try not to open the door more often than necessary. This will reduce the load on the motor.
Make sure that the refrigerator is not standing next to heat sources such as a radiator or oven. Overheating causes the compressor to work harder and noisier. Compliance with operating temperature conditions is the key to quiet operation of your equipment.
Why did the refrigerator start to make noise after defrosting?
Often after defrosting, water gets into the pan or onto the engine elements, causing temporary noise. The water tray above the compressor may also have moved. Check that the tray is installed correctly and let the equipment dry completely before turning it on.
Is it normal for the refrigerator to gurgle?
Yes, the sound of liquid flowing (freon) in the tubes is absolutely normal. This indicates that refrigerant is circulating through the system, cooling the chambers. If the gurgling is not accompanied by a lack of cold, there is nothing to worry about.
Is it possible to lubricate the compressor so that it does not make noise?
The compressor itself is a sealed unit and cannot be lubricated at home. You can only lubricate the external tubes at the points of contact (with a special compound) or the fan bearings. Pouring oil into the motor is strictly prohibited.
How to reduce the hum of an old refrigerator?
For an old unit, the best way is to check the vibration isolation. Place thick rubber under the legs, move the body away from the wall, check the pipes from the back to see if they are touching. If the motor is noisy, the only thing that can help is replacing it or installing a soundproof box (with caution!).
Does the amount of food affect the noise?
A full refrigerator is quieter, since the products absorb sound waves and stabilize the temperature, reducing the frequency of the compressor switching on. An empty refrigerator may hum louder due to resonance inside the empty chambers.