Sharply The resulting noise from the refrigerator compartment can turn life in an apartment into a test of strength. Humming, humming, periodic knocking or crackling - all these sounds can signal both harmless operating features and serious breakdowns. If your the refrigerator operates loudly, you cannot ignore this, because sound discomfort often hides the wear of key components of the unit.
In modern models, be it Bosch, Indesit or LG, the noise level is strictly regulated by the manufacturer and usually does not exceed 40 decibels in normal mode. Exceeding this threshold requires an immediate response. The owner’s primary task is to distinguish design features compressor operation from a real malfunction that requires the intervention of a technician.
In this article we will analyze in detail the physics of the occurrence of extraneous sounds, analyze possible causes and propose an algorithm of actions. You will learn how to conduct primary diagnostics yourself, which will help you save time and budget on calling a specialist. Understanding why the refrigerator is hummingis the first step to silence in your kitchen.
Design features and normal operating noise
Not every sound is a sign of a breakdown. Modern refrigerators are complex devices where the circulation of refrigerant and the operation of electronics are inevitably accompanied by acoustic effects. For example, in models with a system No Frost a fan is constantly running to circulate cold air. Its smooth, monotonous hum is considered an absolutely normal phenomenon.
It is also worth considering the operation of inverter compressors, which are found in brands Samsung i Haier. Unlike older linear models, they do not turn off completely, but only change the power. This can create the sensation of a constant, albeit quiet, low-frequency hum. If you have just installed the refrigerator or defrosted it, compressor may work more intensely in the first hours until the set temperature is reached.
⚠️ Attention: If the sound is monotonous and does not change during the day, and the temperature in the chambers remains stable, most likely the equipment is working as usual. The alarm should be sounded when there is a sharp change in tone or the appearance of impact noise.
It is important to distinguish the nature of the sounds. Gurgling or overflowing of liquid in tubes is the sound of moving Freon. It is especially audible immediately after the compressor is turned off, when the pressure in the system is equalized. Such sounds do not pose a threat and do not require repair. However, if a whistle or hissing is added to them, this may indicate a gas leak, which is already a critical malfunction.
Installation problems and vibration of the case
One of the most common reasons why a refrigerator starts to make a lot of noise is improper installation. Vibration from a running motor is transmitted to the body, and then intensifies if the unit is not level or touches the walls. This creates a resonance effect, which greatly increases the noise level, turning a quiet hum into a deafening hum.
To eliminate this problem, you need to check the horizontalness of the installation. Even a slight misalignment can lead to engine working under increased load. Adjustable legs allow the body to be perfectly level. In addition, it is important to maintain a gap between the back wall of the refrigerator and the wall of the room - usually at least 5-10 cm is required for normal ventilation and absence of resonance.
Often the source of sound is objects located inside or outside the chambers. Check to see if bottles or cans are touching each other when the shelves vibrate. Make sure that on the back of the unit, where condenseris located, there are no foreign objects that could rattle from the flow of hot air.
☑️ Installation diagnostics
Faults of the compressor and start relay
If there are problems with the installation, and the noise is mechanical in nature (knocking, clanging, strong hum), there is a high probability of a malfunction in the heart of the refrigerator - the compressor. This is an electromechanical pump that pumps refrigerant through the system. Wear of internal parts, bearings or piston group leads to the fact that motor-compressor starts to work louder than usual.
Particular attention should be paid to the starting relay. This small element is responsible for starting the engine. If the relay is faulty, it may click, squeal, or make short-circuit sounds. In such cases, the compressor may try to start, make a loud clicking noise and immediately stall. This is a dangerous operating mode that can lead to burning of the motor windings.
| Sound type | Probable cause | Urgency of repair |
|---|---|---|
| Metal clanging | Destruction of the suspension compressor | High |
| Loud clicks | Malfunction of the starting relay | Medium |
| Increasing hum | Wear motor bearings | High |
| Crackling sound at start | Electrical problems | Critical |
Diagnostics of the compressor requires special knowledge and tools. If you hear that unit it is working “out of order”, with vibration radiating to the floor, it is better not to risk it. An attempt to independently repair the compressor unit without experience can lead to a complete replacement of an expensive unit.
Fan noise in the No Frost system
Refrigerators with an automatic defrosting system No Frost equipped with fans that distribute cold air. Over time, the rotating parts of the mechanism can wear out. If you hear an increasing noise, similar to the sound of a working propeller, or periodic crackling, most likely the problem lies in the fan.
A frequent cause of noise is freezing of ice on the blades or fan hub. The ice crust disrupts the balance, and the fan begins to hit the walls or the ice itself. The lubricant in the sliding bearing may also dry out, which leads to dry friction and a characteristic squeaking or humming sound.
How to get to the fan?
To replace or clean the fan, you usually need to remove the back wall of the freezer. In some models, access is through the freezer, in others through the rear panel from the outside. Before starting work, be sure to disconnect the refrigerator from the mains!
In some cases, especially in models Indesit or Atlant, the fan may touch wiring or poorly secured structural elements. A visual inspection will help identify distortions. If the problem is ice freezing, the tightness of the door seal may be broken, and moist air gets into the chamber.
The influence of foreign objects and the contents of the chambers
Sometimes the answer to the question “why the refrigerator is loud” turns out to be banal. The source of noise may be food or utensils placed inside. Glass bottles, metal pans or plastic containers, in contact with each other or with the walls, resonate from the slightest vibration of the shelves.
Check the shelves and drawers. If the glass shelf is loose or cracked, it will rattle. Plastic vegetable crates may vibrate if they are not inserted into the guides correctly. It is enough to adjust the contents so that the noise level decreases to a comfortable level.
Also pay attention to the rear grille of the refrigerator (condenser). If it is deformed or heating pipes are leaning against it, the vibration of the compressor will be transmitted to them, creating a strong metallic hum. Make sure that nothing touches the metal tubes at the back of the unit.
When you need to call a technician: critical signs
There are a number of symptoms in which independent actions are useless or dangerous. If refrigerator it not only makes noise, but also stops freezing, and frost or, conversely, heat appears on the walls of the chambers, these are signs of a freon leak or blockage of the capillary system. In this case, the compressor may work without stopping, trying to gain temperature, which is accompanied by severe overheating and noise.
A burning smell, melted wiring in the compressor area, or sparking are direct signs of an electrical malfunction. It is strictly prohibited to operate such a unit. It is also worth calling a specialist if, after defrosting and checking the installation, the noise does not disappear within 24 hours.
⚠️ Attention: Never try to solder pipes or open the freon circuit yourself. This requires a license, special equipment and knowledge. Inept actions can lead to a fire or refrigerant poisoning.
Regular maintenance, including cleaning the condenser from dust and checking the seals, extends the life of the equipment. Dust on the heat exchanger causes compressor to work longer and more intensely, which inevitably leads to increased noise levels and energy consumption.
Frequently asked questions (FAQ)
Why does a new refrigerator run loudly in the first days?
The new unit may make more noise than usual due to the grinding in of parts and the initial temperature rise. Also check that all shipping bolts and films have been removed. If after 2-3 days the noise does not subside, the legs may need to be adjusted.
Can an old refrigerator begin to make more noise?
Yes, over time, the engine bearings wear out, the rubber shock absorbers under the compressor dry out and the oil thickens. This leads to increased vibration and hum. Replacing the shock absorbers or lubricating the fan will help partially solve the problem.
Is it normal for the refrigerator to make the sound of bursting bubbles?
Yes, this is the sound of the refrigerant (freon) moving through the evaporator tubes and capillaries. This is especially often heard after the compressor is turned off, when the pressure in the system equalizes. This is a normal physical process.
How to reduce the noise of a refrigerator without repair?
Try to move the refrigerator away from the wall, level it, check whether the objects inside the chambers are touching each other. Installing anti-vibration pads under the legs and regularly cleaning the rear grille from dust will also help.
Is it dangerous to ignore a loud knocking sound in the compressor?
Yes, it is dangerous. A knock may indicate damage to the internal mechanisms of the pump or suspension. Further operation may lead to jamming of the motor, short circuit and failure of the refrigerator with the impossibility of recovery.