Sudden or The growing noise in the refrigerator compartment can unsettle even the calmest person, because we spend a significant part of our time in the kitchen. Humming, crackling, gurgling or whistling not only irritate the ear, but also often serve as the first warning signs of a malfunction compressor or disruption of the refrigerant circulation. These sound signals cannot be ignored, since timely diagnosis helps to avoid expensive repairs or complete replacement of the unit.
It is important to understand that absolutely silent refrigerators do not exist in principle, but the nature of the sound is crucial for determining the condition of the equipment. The norm is the smooth, monotonous hum of a running engine, which is practically inaudible from the next room when the door is closed. If refrigerator begins to make sharp, intermittent or too loud sounds, this indicates an imbalance in the operation of the system or mechanical damage to the components.
Before calling a technician, it is necessary to conduct an initial independent diagnosis in order to accurately describe the problem to a specialist or fix it on your own. Often the reason lies in a banal violation of operating rules, which can be easily corrected without the use of tools. In this article, we will analyze in detail all possible sources of noise and methods for neutralizing them.
Natural sounds of a working unit
Many users begin to panic when they hear the first sounds after purchasing new equipment, although in fact compressor it is working normally. Modern models, especially those equipped with inverter motors, can produce specific sounds associated with the physics of processes within the system. Understanding these nuances will allow you to distinguish normal operation from a breakdown and not waste time on false calls to service centers.
One of the common phenomena is the sound of flowing liquid or gurgling, which occurs when freon moves through the evaporator and condenser tubes. Once the compressor is turned off, this sound may become louder as the pressure in the system equalizes and the refrigerant continues to circulate under the influence of gravity. This is absolutely normal for most models, including popular brands like Bosch or Liebherr.
It is also worth considering that case materials can react to temperature changes by expansion or contraction, producing a characteristic crackling noise. The plastic of the internal shelves and the metal casing sometimes make clicking noises, especially in the first days of use or after defrosting. If these sounds are not accompanied by vibration or hum, there is nothing to worry about.
⚠️ Warning: If your new refrigerator makes a loud metallic clanging or grinding noise in the first minutes of operation, unplug it immediately. This may indicate a manufacturing defect or damage during transportation.
Vibration and improper installation of equipment
One of the most common causes of loud noise is banal vibration of the housing, caused by improper installation of the unit on the floor. If refrigerator is unstable or skewed, the operating compressor causes resonance, which greatly amplifies the sound waves. As a result, a quiet hum turns into an obsessive hum that can be heard throughout the apartment.
To fix this problem, you need to check the horizontal installation using a building level. Height adjustment is carried out by rotating the support legs located in the front lower part of the housing. Achieve such a position that the unit stands as stable as possible and does not wobble when lightly pressing on the corners.
☑️ Vibration diagnostics
In addition, it is important to ensure sufficient clearance between the rear wall of the refrigerator and the wall of the room. If the distance is too small, the vibration is transmitted to the building structures, and the wall itself begins to hum. A distance of at least 5-7 centimeters is considered optimal for free air circulation and vibration damping.
Problems with the compressor and motor
The heart of any refrigerator is compressor, and it is this that most often becomes the source of noise when worn or malfunctioning. If the unit begins to hum much louder than before, or the sound becomes intermittent, this may indicate wear on the motor shaft bearings or a violation of the motor itself.
In older models, a situation often occurs when the rubber shock absorbers on which the compressor is attached dry out or tear. In this case, the metal housing of the motor begins to touch the frame of the refrigerator, causing a strong metallic clanging sound when starting and stopping. Replacing these inexpensive rubber bands often completely solves the problem of loud noise.
Inverter or conventional compressor?
Inverter motors operate quieter and smoother, since they do not turn off completely, but only reduce the speed. Conventional compressors operate jerkily (on and off), which creates more noise and vibration at start-up.
If you hear a loud knocking or clanging directly inside the motor, this is a bad sign, indicating destruction of the internal mechanical parts. In such cases replacement of the compressor is inevitable, and continuing to operate the equipment is dangerous, since the motor can jam at any moment.
No Frost system fan malfunctions
In refrigerators with a system No Frost for Fans located in the freezer and refrigerator compartments circulate cold air. Over time, ice can build up on the fan blades, especially if the door seal is broken or heat is exposed frequently. The ice crust interferes with rotation, and the fan begins to hum or crack, touching the housing.
Worn bearings of the fan itself can also be a source of noise. In this case, the sound usually resembles an annoying buzz or whistle, which intensifies when the door is opened (since in many models the fan should stop when the door is opened, but if it continues to make noise, there is a mechanical problem).
Diagnosis of this malfunction often requires partial disassembly of the interior panel. If you find ice on the blades, you need to completely defrost the refrigerator within 24 hours. If the problem is in the bearing, you will need replacement a new fan assembly.
⚠️ Attention: Before any disassembly of the inside of the refrigerator, be sure to disconnect the device from the power supply. Working with electrical appliances under voltage is deadly.
Sounds of the refrigerant and capillary system
The source of strange sounds can be the refrigerant circulation system itself. If the refrigerator makes sounds resembling pouring water or a strong hissing sound, this may indicate improper freon charging or the presence of air in the system. However, as mentioned earlier, a slight gurgle is normal.
A more alarming signal is a whistle, which may indicate a gas leak through a microcrack. At leaks, the pressure drops and the escaping gas creates a characteristic high-frequency sound. If a cessation of cooling is added to the whistle, it is necessary to urgently look for a leak.
You should also pay attention to the capillary tube. If it is not secured securely enough and vibrates when touching other metal parts, rattling occurs. Securing the tube with special clamps or placing a piece of porous rubber between the tube and the body helps eliminate this defect.
Noise diagnostic table by type of sound
To simplify the process of identifying a malfunction, we suggest using a summary table. It will help you compare the sound you hear with the most likely cause and the necessary actions.
| Sound type | Probable cause | Difficulty of repair | Necessary actions |
|---|---|---|---|
| Monotone buzz | Normal operation of the compressor | No | Check the installation, move it away from the wall |
| Loud gurgling | Freon circulation | No | Do nothing, this is normal |
| Metal clanging | Touching pipes or motor parts | Low | Bend tubes, replace shock absorbers |
| Whistling or squeaking | Fan malfunction | Medium | Defreeze or replace the fan |
| Intermittent knocking | Compressor wear | High | Call a technician, replace the motor |
Prevention and operating rules
In order for your refrigerator to serve for a long time and quietly, it is important to follow simple operating rules. Do not place the unit close to a wall or furniture; leave gaps for ventilation. Regularly check the integrity of the door seals, as their wear leads to moisture entering and the formation of ice on the fan.
Do not overload the shelves and make sure that bottles and cans do not touch each other and the walls of the chamber. Vibration from a running motor can cause glass containers to rattle, creating the illusion of equipment failure. Use special organizers and food holders.
It is also important to periodically clean the rear condenser grille of dust and pet hair. A condenser clogged with dust causes the compressor to work longer and harder, which increases noise levels and energy consumption. The grille should be vacuumed carefully so as not to damage the thin tubes.
Why does the refrigerator hum loudly immediately after turning on?
A loud start is typical for conventional (non-inverter) compressors. At the moment of starting, the motor requires maximum force to rotate the piston group and create pressure in the system. If after 1-2 minutes the hum subsides and becomes even, this is absolutely normal. If the loud sound persists, check the shock absorbers.
Is it possible to lubricate a fan if it starts to creak?
Most household refrigerators have fans with sealed bearings that cannot be lubricated. Trying to drip oil may damage the plastic or windings. The best solution is to replace the entire assembly, which is inexpensive and reliable.
Is the quiet crackling of plastic inside the camera dangerous?
No, this phenomenon is called thermal expansion. The plastic of the shelves and the inner lining react to the cycles of turning the compressor on and off. This sound does not pose any threat to equipment and does not require intervention.