Constant hum, sudden The humming or obsessive gurgling of a refrigerator can upset even the calmest person. When it is impossible to have a normal conversation in the kitchen, and at night the unit interferes with sleep, there is a strong desire to solve the problem immediately. Remove the noise of the refrigerator This can be done in different ways, from simple rearrangement to complex repairs.
Before calling a technician or looking for a new household appliance store, it is worth conducting independent diagnostics. Often the source of an annoying sound is not a breakdown, but a banal vibration of the case or incorrectly positioned legs. In this article we will analyze all the possible causes of acoustic discomfort.
You will learn how to distinguish normal operation compressor from signs of an impending breakdown. We will look at sound insulation methods, installation rules and maintenance nuances of various defrosting systems. It is important to understand that silence in the operation of equipment is not only comfort, but also an indicator of the serviceability of all components.
Primary diagnosis: normal hum or breakdown?
Not every sound made by a refrigerator indicates a malfunction. Modern models, especially with the system No Frost, work more complex than older units, so the range of their “musical” abilities is wider. Normal operating noise usually smooth, monotonous and does not cause resonance in the room.
If you hear a quiet pouring of liquid or rare crackling of plastic when temperature changes, no need to worry. This is the physics of processes: refrigerant circulates through tubes, and materials expand or contract. However, if the sound becomes shrill, intermittent, or is accompanied by vibration of the floor, it’s time to sound the alarm.
⚠️ Attention: If the humming is accompanied by a burning smell, strong heating of the motor, or constant knocking out of plugs, immediately unplug the device from the network. Operation in this mode may result in a fire.
To accurately determine the sound source, place your palm on different parts of the case. The vibration may come from the back wall where the motor is located, or from the side panels. Sometimes it is enough just to touch the body for the hum to stop - this is a sure sign of resonance.
Particular attention should be paid to the nature of the noise when starting and stopping the engine. If at these moments a loud metallic clang is heard, the problem may be compressor suspension or loosening of the mounting bolts. The table below shows the main types of sounds and their probable causes.
| Sound type | Probable cause | Degree of danger |
|---|---|---|
| Monotonous hum | Normal compressor operation | Safe |
| Gurgling | Freon circulation | Safe |
| Loud knocking | Failure of valve or suspension | Requires repair |
| Whistling/Hissing | Freon leak or problem with fan | High |
| Plastic cracking | Thermal expansion | Safe |
Vibration and incorrect installation
The most common reason why a refrigerator starts to hum more than usual is a violation of the installation rules. Even a perfectly serviceable unit will rattle if it stands crookedly or touches furniture. Vibration of the case transmitted to the floor and walls, amplifying the sound significantly.
Check the distance between the back wall of the refrigerator and the wall of the room. It should be at least 5-7 centimeters for free air circulation. If the equipment is standing closely, the motor overheats and hums louder, and vibration is transmitted to building structures.
Be sure to check whether the condenser pipes or the refrigerator body itself are touching nearby objects: tables, chairs, kitchen units. Even the slightest touch while the motor is running turns a nearby object into a resonator, multiplying the noise.
Often the problem lies in the adjusting feet. Over time, they can unwind or, conversely, jam. If the floor is uneven, the refrigerator stands on three legs, and the fourth dangles in the air. This leads to distortion and strong humming.
Adjusting the support legs and eliminating distortions
To remove noise caused by the incorrect position of the unit, it is necessary to re-set the level. This procedure is simple and does not require any special tools other than perhaps an adjustable wrench or screwdriver. The main thing is to ensure a stable position on all four supports.
Tilt the refrigerator forward slightly (this is usually safe if there are no heavy glass shelves inside) to gain access to the adjustment screws. They can be located in the front at the bottom or at the back, depending on the model Indesit, Atlant or Bosch.
☑️ Adjusting the legs of the refrigerator
Twist or unscrew the supports until the body is strictly horizontal. After this, shake the refrigerator slightly. If it stands like a glove and does not wobble, then the task is completed. A loose fit of at least one leg is a guarantee that vibration it won’t go anywhere.
If the floor is slippery (for example, ceramic tiles), even perfectly aligned legs may not give the desired effect. In such cases, special anti-vibration mats made of thick rubber can be placed under the supports. They dampen vibrations and prevent the equipment from “riding” on the floor when starting the engine.
Do not forget that over time the adjusting nuts can spontaneously unscrew due to constant shaking. Periodically check their tightness so that the problem does not return.
Problems with the compressor and its mounting
If external factors are excluded, and the refrigerator continues to make noise, the source of the problem may be inside the technical compartment. The compressor is the heart of the refrigerator, and its operation cannot be absolutely silent, but it must be predictable. A loud knock or metallic clanging often indicates wear on the internal parts of the engine.
However, before you risk breaking the engine itself, check its mounting. The compressor is installed on special shock-absorbing springs or rubber pads that dampen vibration. Over time, the rubber dries out, cracks or flies off, and metal begins to hit metal.
⚠️ Attention: To inspect the internal components, you must remove the rear protective cover. Do this only with the device completely disconnected from the electrical network!
Visually inspect the condition of the springs and mounting bolts. If you notice that the motor “walks” when starting, or the rubber washers have turned into crumbs, they need to be replaced. These are inexpensive parts that can be found in spare parts stores for household appliances.
Sometimes a temporary solution helps: place additional pieces of thick rubber under the mounting points to stabilize the position of the motor. But this is only a half-measure - for a long-term effect it is better to install original shock absorbers.
Is it possible to lubricate the compressor?
It is strictly forbidden to lubricate the compressor itself or its electrical contacts. Lubrication is required only for the rubbing mechanical parts of the suspension, if provided for by the design, and only with special compounds that do not destroy the rubber.
It is also worth checking the tubes coming from the compressor. If they are too close together or touching the housing, they will ring when the motor vibrates. Carefully, with your hands (without tools, so as not to damage the thin metal), separate the tubes, ensuring a gap of several millimeters.
Ventilation and No Frost system
In refrigerators with the system No Frost fans are responsible for circulating cold air. They are often the source of a whistling or howling sound, especially if ice has formed in the freezer.
When the fan blades touch a crust of ice, a characteristic crackling or hum is heard, which can intensify over time. This occurs due to a violation of defrosting cycles or a malfunction of the evaporator heating element. In such a situation, simply “removing the noise” by adjusting the legs will not work - defrosting is needed.
Unplug the refrigerator and leave it with the doors open for at least 24 hours. This time is necessary for all the ice inside the system No Frost to completely melt and the water to drain. After thorough drying, turn on the unit. If the noise disappears, the problem was in the ice.
Another reason for noise in this area is contamination of the fan with dust. The fan motor may hum due to dry grease or worn bearings. In this case, lubricating or replacing the entire assembly will help, which is a standard repair procedure.
Also check to see if the air outlet holes in the freezer are clogged with food. Impaired circulation causes the fan to work with overload, which inevitably leads to an increase in the noise level.
Resonance of dishes and foreign objects
Sometimes the source of annoying sound is not the equipment at all, but its contents. Glass bottles, metal pans or jars placed close to each other or to the walls of the chamber may resonate with the frequency of the compressor.
Try removing all food from the refrigerator and turning it on empty. If silence is restored, it means the arrangement is incorrect. Avoid placing containers containing liquids on door shelves if they are loose, and ensure that food does not touch the back wall.
Inspect the top of the refrigerator. Often boxes of cereals, jars or decorative elements are placed there. When the motor is running, they begin to rattle, creating the illusion of a breakdown. Remove all excess from the top cover of the unit.
Also check the internal shelves. The glass inserts must fit tightly in the plastic guides. If there is play, place a piece of soft cloth or foam rubber under the glass to prevent rattling.
When you need to call a specialist
There are situations when independent actions are useless or even dangerous. If you have gone through all the options - from adjusting the legs to defrosting, and refrigerator noise not quiet, a serious technical malfunction has probably occurred.
Alarming symptoms requiring professional intervention:
- 🛠️ The compressor works without interruption, without turning off, and gets very hot.
- 🛠️ There is a smell of burning or burnt wiring.
- 🛠️ The sound of flowing water is heard, but the refrigerator has stopped freezing (possible freon leak).
- 🛠️ The engine hums, tries to start, clicks, but does not start.
In these cases, attempting to repair it yourself can lead to the final failure of the equipment. Replacing a compressor, filling with freon or repairing an electronic control board require special equipment and skills.
Is it worth replacing an old refrigerator with a new one because of noise?
If the refrigerator is more than 10-12 years old and the compressor is noisy, it is often more economical to buy new equipment. Repairing an old motor with replacement and refueling can cost up to 50-60% of the price of a new budget unit.
Remember that modern models of equipment, as a rule, operate more quietly due to the use of inverter compressors. If your old unit cannot be “tamed,” perhaps it’s time to think about upgrading your kitchen.
Why does the refrigerator hum loudly immediately after turning on?
At the moment of startup, the compressor works at maximum speed to quickly gain the required pressure in the system. This creates peak load and maximum noise. If after 5-10 minutes the sound becomes quieter and smoother, this is normal operating mode.
Can a new refrigerator make noise?
Yes, new equipment can also make sounds. This often happens due to transportation bolts that were forgotten to be unscrewed (if there were any), or because the unit has not yet “grown in” to the installation site. Give it a couple of days to work idle.
How to reduce the noise of a refrigerator if it is in a niche?
If the refrigerator is built into a kitchen unit or is located in a niche, make sure that it does not touch the walls of the niche. There should be gaps on all sides. You can cover the side walls of the niche with soundproofing material, but this is an extreme measure.
Does filling the refrigerator affect the noise level?
Yes, it does. An empty refrigerator may make a louder noise due to the resonance of the free space inside the chambers. Filled shelves and products act as additional sound absorbers. However, it is also impossible to overload the unit “to capacity” - this disrupts air circulation.