A sudden extraneous sound in the operation of household appliances can unsettle any owner. Refrigerator - this is a unit that operates 24 hours a day, 7 days a week, so even a slight change in background sound immediately catches your ears. If before it worked quietly and unnoticed, but now it began to make an obsessive rattling, buzzing or loud clicks, this is a signal that a failure or wear of parts has occurred in the system.
The problem cannot be ignored, since noise it may be a harbinger of a serious breakdown that will require expensive service center intervention. In some cases, a simple adjustment or replacement of a small part is enough to restore silence. In other situations, delay threatens failure of compressor the most expensive component of the device. Let's figure out why the unit makes strange sounds and what to do about it.
Natural noise versus pathological rattling
Before sounding the alarm and looking for the technician’s phone number, it is important to carry out an initial differentiation of sounds. Modern models of refrigerators, especially those equipped with the No Frostsystem, emit a certain background hum, which is the norm. This is the sound of fans operating, circulation refrigerant in the evaporator tubes and periodic switching on of the compressor. However, the nature of the sound should not be sharp, intermittent or reminiscent of a metallic clang.
Low-frequency humming of the motor and quiet gurgling of freon are considered normal. If you hear as if someone is shaking nuts inside, or the sound resembles the work of a hammer drill, this is already a pathology. Owners often confuse case vibration with internal failure. To rule out this option, try leaning lightly on the door or side wall of the unit. If the sound changes or disappears, then the problem lies in resonance the housing or improper installation, and not in the insides.
It is worth considering the age of the equipment. Old Soviet models ZIL or Biryusa always worked louder than their modern counterparts. If a new refrigerator purchased recently makes a loud noise, this is a reason to immediately check the warranty card and operating conditions. In the first days of operation, grinding in of parts may occur, but strong rattling does not apply to this.
Installation problems and vibration of the case
The most commonplace, but common reason why a refrigerator rattles is - this is an incorrect setting. The unit must stand strictly horizontally and vertically. If the floor is uneven or the legs are twisted unevenly, a misalignment occurs, which leads to severe vibrations. Vibration is transmitted to the floor, walls and metal elements of the refrigerator itself, causing rattling and humming.
The second important aspect is the distance to the walls and furniture. The back of the refrigerator is equipped with a condenser grill and a compressor. If the unit is moved close to the wall, air circulation is disrupted, the motor overheats and begins to work with increased load, making more noise. In addition, vibration can be transmitted to objects standing nearby or on the top panel.
☑️ Checking the installation of the refrigerator
⚠️ Attention: When installing the refrigerator on a soft floor covering (linoleum, carpet), use special anti-vibration pads under the legs. This will reduce the transmission of vibrations and prevent the unit from “moving away” over time.
Also check that the back wall or sides of the heating system pipes or other communications do not touch. Even a light touch can turn a quiet compressor into a loud knocking noise. Make sure that there is nothing on the shelves inside the chambers that could vibrate from the operation of the motor - glass bottles or plates often become the source of clinking.
Compressor malfunctions: the heart of the refrigerator
Compressor is the main engine of the refrigerator, creating pressure for the circulation of the refrigerant. This is most often the source of noise. If you hear a loud humming sound that turns into rattling, or metallic knocking noises when starting, the problem may be mechanical wear on the internal components of the motor. In modern inverter models, the noise is usually lower, but if the shaft bearings are worn out, the hum becomes a constant companion.
One of the common problems is a faulty start relay. This small element is responsible for starting the engine. If the relay contacts are burnt or the mechanism is stuck, the compressor may hum but not start, or make a loud clicking noise before stopping. In such cases, the motor tries to start, but due to the lack of starting torque it makes a characteristic “rattling” or humming sound.
It is also worth paying attention to the compressor mount. The motor is suspended on springs or rubber shock absorbers inside the lower part of the unit. Over time, rubber gaskets dry out, crack or fall off. As a result, the metal casing of the compressor begins to hit the tubes or body of the refrigerator with each vibration, creating a strong roar.
How to check the condition of the compressor without disassembling?
Carefully (observing safety precautions and not touching the hot parts) place your hand on the body of the operating compressor. If vibration is transmitted throughout the refrigerator body and is accompanied by a metallic clanging sound, there is likely a problem with the shock absorbers or internal bearings. However, an accurate diagnosis can only be made by a technician with a device for checking the windings.
⚠️ Attention: Replacing a compressor or starting relay yourself requires skills in working with electrical equipment and refrigerants. A faulty compressor can lead to a short circuit or leak of freon.
Noise of the fan and No Frost system
If your refrigerator is equipped with a system No Frost or Total No Frost, its design contains fans that circulate cold air. Rattling or humming in this case often comes from them. The fan blades may become coated with ice, especially if the door seal is broken or defrosting occurs frequently with errors.
When ice freezes on the blades or on the walls of the air duct, the fan begins to touch ice build-ups. This creates a characteristic crackling or rattling sound, similar to the operation of an old meat grinder. The sound may be periodic: appearing and disappearing as the ice melts or breaks off. The noise may also be caused by dried grease in the bearing of the fan itself.
In some models, fans are located not only in the freezer, but also in the refrigerator (for zone cooling). If you hear noise from the top, check to see if there is any food foil or a label that may have come off and is now waving in front of the blades.
Replacing the fan is a relatively simple procedure, but requires disassembling the back wall of the freezer. It is important to choose an analogue with exactly the same characteristics and dimensions so that it fits into its original place without modifications.
Rattling of tubes and internal elements
At the back of the refrigerator there is a radiator grille and a system of copper tubes through which freon circulates. Vibration from a running compressor is transmitted to the entire circuit. If the tubes are too close to each other or touch the body, they begin to rattle. This creates a high-frequency metallic ringing that is very annoying.
Often owners, trying to clean the back of the refrigerator, accidentally move the tubes or capillary system, violating the factory clearance. As a result, when the engine starts, a rattling noise begins. Also, the source of sound can be plastic clamps, which dry out over time and no longer securely fix the tubes.
Sometimes the rattling comes from inside the chambers. This could be an egg tray that is poorly secured, or a glass shelf lying on plastic guides with play. Check all the moving parts inside: drawers, shelves, trays on the door. Remove all unnecessary things that can vibrate.
| Sound type | Probable cause | Difficulty of repair | Required actions |
|---|---|---|---|
| Metal clanging when startup | Wear of compressor suspension | Average | Replacement of shock absorbers |
| Crackling and grinding | Ice on the fan (No Frost) | Low | Defrosting or replacing the heating element |
| Humming with clicks | Faulty start relay | Low | Replacement relay |
| Constant ringing | Tubes touching the body | Low | Adjusting the tube gap |
When you need to call a technician
There are situations when independent repairs not only will not help, but will also aggravate the situation. If you hear whistling, hissing, or loud popping noises, this may indicate a leak refrigerant or problems with the compressor valves. Attempts to “fix” it with your own hands often lead to complete failure of the unit.
Also, the help of a specialist is necessary if:
1. The compressor hums, but does not start, and after a while there is a click and it goes silent (the cycle repeats).
2. You smell burnt wiring or plastic.
3. After defrosting, the noise did not disappear, but intensified.
4. The unit has stopped freezing, but continues to make noise.
Professional diagnostics allow you to accurately determine the source of the noise using a stethoscope and measuring instruments. The technician will be able to distinguish the noise of the bearing from the noise of the valves, which is impossible to do by ear without experience.
⚠️ Attention: If you notice oil under the refrigerator or on the floor next to it, immediately disconnect the device from the network. This is a sign of system depressurization or compressor breakdown. It is dangerous to operate such a refrigerator.
Preventing noise and extending service life
In order for the refrigerator to operate quietly and for a long time, it must be properly cared for. Regular defrosting (even for the No Frost system, complete defrosting is recommended once a year) helps to avoid the formation of ice jams in the fans. Keep the condenser at the back clean: dust and animal hair, accumulating on the grill, make the motor work harder and noisier.
Do not overload the shelves with products. An overcrowded refrigerator puts additional stress on the air circulation system and compressor. Additionally, tightly packed foods may move and rattle when vibrated. Distribute the load evenly and make sure that the products do not touch the back wall of the chamber.
Monitor the condition of the rubber seals on the doors. If the elastic band breaks or loses its elasticity, warm air enters the chamber. The compressor is forced to work almost continuously to maintain the temperature, which leads to overheating and increased noise. Replacing the seal is a simple procedure that you can do yourself.
The secret of quiet operation
Once every six months, check the tightness of the mounting bolts on the rear panel (if it is removable) and the condition of the legs. Sometimes it is enough just to tighten a loose leg to remove the annoying hum.
Frequently asked questions (FAQ)
Why does a new refrigerator make a loud noise in the first days?
A new refrigerator may make noise due to the fact that the parts have not yet gotten used to it. Also, the oil in the compressor may have shifted during transportation. Allow the equipment to stand unplugged for several hours after delivery to allow the oil to drain into the crankcase. If the noise does not go away after a week, it may be a defect.
Can a compressor be lubricated if it starts to hum?
No, modern compressors are sealed and do not require lubrication during operation. Attempting to drill a hole or disassemble the casing will result in freon leakage and failure. If the compressor is humming due to wear, it needs to be replaced entirely.
Is the sound of ice breaking inside dangerous?
The sound of cracking ice during defrosting (in No Frost systems) is normal. The ice crust on the evaporator cracks due to temperature changes. However, if the crackling noise is very loud and constant, it is possible that ice has frozen onto the fan, and its blades are touching the ice coat.
How to reduce the vibration of an old refrigerator?
Try placing pieces of thick rubber, felt or special anti-vibration mats under the legs. Make sure that the refrigerator does not touch the wall or adjacent furniture. Sometimes it helps to install the unit in a corner where the walls are stiffer.
Why does the refrigerator click but does not turn on?
This is a classic sign of a malfunction of the start relay or the compressor itself. The relay tries to start the engine, a click is heard, but due to a malfunction the start does not occur. Diagnostics and replacement of the relay or motor repair are required.