Suddenly appeared Extraneous sound in household appliances always causes concern, especially when it comes to equipment that operates around the clock. Many owners notice that the device makes periodic crackling noises, reminiscent of the sound of bursting plastic or crackling wood in a fire. The intensity of these sounds can vary from barely audible clicks to distinct pops that interfere with rest at night. refrigeration equipment, working around the clock. Many owners notice that the device makes periodic crackling noises, reminiscent of the sound of bursting plastic or crackling wood in a fire. The intensity of these sounds can range from barely audible clicks to distinct pops that disturb nighttime rest.
There is no need to panic ahead of time, since in most cases such acoustic effects are a consequence of natural physical processes occurring inside the case. However, they cannot be ignored completely either, because sometimes a crackling noise signals problems with the unit’s fastening. Understanding the nature of the sound will help you determine whether a specialist’s intervention is required or whether it’s enough to just wait. deformation of parts or problems with mounting the unit. Understanding the nature of the sound will help determine whether professional intervention is required or whether it is enough to simply wait.
In this article we will analyze in detail the mechanisms of noise, divide them into safe and dangerous, and also provide an algorithm of actions for self-diagnosis of your device. It is important to be able to distinguish the normal operation of the system from the harbingers of a breakdown.
Natural causes of sounds during compressor operation
The main source of noise in the refrigerator is its “heart” - the compressor. During operation, this unit is subjected to high loads and temperature changes, which inevitably causes certain acoustic effects. When piston group starts to move, vibration occurs, which is transmitted to the body and adjacent structural elements. Often it is this hum and accompanying crackling that is perceived by users as a malfunction, although in fact this is normal operation.
Particular attention should be paid to the thermal expansion of materials. The internal chambers of the refrigerator, like the evaporator, constantly change their temperature. The plastic from which the inner walls are made and the metal of the evaporator have different expansion coefficients. During sudden cooling or, conversely, during defrosting, materials contract and expand at different rates, creating a characteristic cracking sound. This phenomenon is especially noticeable in new models or after defrosting.
⚠️ Attention: If the crackling noise is accompanied by strong heating of the motor or the appearance of a burning smell, immediately unplug the device. This may indicate an overload in the electrical circuit or an interturn short circuit.
The refrigerant may also be the source of the sound. Freon circulating through the pipes of the system changes its state of aggregation and pressure when passing through the capillary expander. This process is sometimes accompanied by gurgling and slight hissing, which can mix with the general background of the unit. It is considered normal if these sounds last no more than 10-15 seconds after the compressor stops.
Thermal expansion of plastic housing elements
One of the most common reasons why a refrigerator cracks is precisely the physics of materials. Modern manufacturers actively use various types of plastic for the internal lining of chambers and the formation of door shelves. These materials are sensitive to temperature changes, and when the thermostat operates they are the first to react. The sound often resembles a creaking or dry crackling sound, which can occur at certain intervals.
The intensity of such a crackling noise depends on the quality of the build and the materials used. Cheaper models may have thinner plastic, which increases resonance. In addition, if the refrigerator is not installed level, the body may experience additional stress, which increases the deformation of the panels during temperature changes. In this case body geometry it is slightly violated, but to produce an acoustic effect.
Users often notice an increase in crackling immediately after loading a large amount of warm products. The sudden increase in temperature inside the chamber causes the plastic to expand faster than usual. After some time, when the temperature stabilizes, the sounds should stop. If the cracking does not stop for hours, perhaps the problem lies deeper.
- 🔊 Sharp clicks when the light in the chamber is turned on (thermostat reaction).
- 🔊 Periodic crackling in the first hours after defrosting.
- 🔊 Creaking when opening and closing the door (seal friction).
- 🔊 A hum that turns into a crackling noise at maximum load on the compressor.
It is important to note that in models with the system No Frost there are more plastic elements due to the complex air duct system. Therefore, owners of such refrigerators may hear expansion sounds more often than owners of drip systems. This is not a defect, but rather a design feature.
Installation problems and vibration of the case
Improper installation is the second most common cause of annoying sounds. If the refrigerator is not on a level surface, its body will warp. This leads to the fact that the door may not fit tightly, and the internal mechanisms work under increased load. Vibration from a running compressor is transmitted to the floor and walls, causing resonance and rattling, which can easily be confused with a crackling sound inside the device.
To eliminate this problem, it is necessary to check the horizontalness of the installation. Use a spirit level or simply pour some water on the top panel (if it is level) - the water should not flow to one side. Adjustment is carried out using the front support legs, which can be twisted or unscrewed, changing the height of the angle.
☑️ Installation diagnostics
It is also important to ensure a gap between the back wall of the refrigerator and the wall of the room. The minimum distance should be 5-10 centimeters. If the condenser pipes or the casing itself touch the wall, the vibration will be transmitted to the building structure, creating the effect of increased noise. In addition, placing the heating elements close to the wall can lead to overheating of the compressor.
⚠️ Attention: Do not install the refrigerator close to furniture or a wall without a gap. This disrupts the air circulation necessary to cool the condenser, which leads to overheating and accelerated wear of the compressor.
Another nuance is objects standing on the refrigerator. Many people place microwaves, baskets or decorative items on top. When the compressor operates, these objects begin to vibrate and rattle, creating the illusion that the refrigerator itself is broken. Remove all unnecessary things from the top panel and check if the sound has disappeared.
Comparison of normal and emergency sounds
To effectively diagnose the condition of equipment, you need to learn to distinguish the nature of the sounds. Below is a table that will help you classify the noise you hear and determine the degree of danger for your device. Remember that Acoustic comfort is a subjective concept, but the technical parameters of noise have clear boundaries.
| Type of sound | Probable cause | Degree of danger | Required actions |
|---|---|---|---|
| Uniform humming | Compressor operation | Normal | No action |
| Intermittent crackling/clicking | Thermal expansion of plastic | Normal | Observation |
| Gurgling/murmuring | Refrigerant movement | Normal | No action |
| Loud metallic knock | Destruction of the compressor suspension | High | Call a technician |
| Whistling or hissing | Freon leak | Critical | Turn off and call a technician |
By analyzing the data in the table, we can conclude that most of the sounds we hear do not pose a threat. However, if the nature of the sound changes from quiet to loud, or a metallic clanging sound appears, this is a sure sign of mechanical destruction of the components. Compressor in such cases, it may work intermittently, trying to compensate for pressure loss or vibration.
It is also worth paying attention to the frequency of sounds. If the crackling noise has become a constant companion to the operation of the device, even when there is no food in the chamber and the door is closed, this is a reason to be wary. In normal mode, the expansion cycles of materials subside after reaching the mode.
The influence of the No Frost system on acoustics
Refrigerators with an automatic defrosting system No Frost have a more complex design than their drip counterparts. The presence of fans for air circulation and heating elements for defrosting the evaporator adds new sources of sound. The fan located behind the back wall of the freezer may make a whistling or crackling sound when operating if ice has formed on its blades.
When the layer of ice becomes too thick, it begins to interfere with the rotation of the impeller. The blades touch the ice crust, producing a characteristic crackling or grinding sound. This usually occurs before the automatic defrost cycle. If the defrost system is working properly, the ice will melt and the sound will disappear. However, if the problem occurs frequently, the defrost timer or defrost sensor may be faulty.
In addition, the No Frost system has more plastic ducts. They are also subject to thermal expansion. The temperature difference between the cold air coming from the evaporator and the warmer air in the chamber can cause the walls of the air ducts to crack. This is absolutely normal and does not require repair.
Why is No Frost noisier?
Refrigerators with the No Frost system always operate louder than usual due to the presence of a fan. The sound of a running motor may sound like a howling or crackling sound, especially if the fan bearing has begun to wear out.
It is important to keep the drainage system clean in such models. If the hole for draining melt water becomes clogged with debris or ice, the water will begin to freeze in unintended places, forming ice plugs. When the compressor is running, these plugs can crack or create additional pressure, causing noise.
When you need to call a technician: alarming symptoms
Despite the fact that many sounds are natural, there are situations where delay can lead to expensive repairs. If you hear a loud metallic knocking sound, similar to hammer blows, this may indicate that the compressor's internal suspension has failed. The springs on which the motor is suspended could burst, and it began to beat against the walls of the casing.
Another alarming signal is a cracking sound, accompanied by a cessation of cooling. If the device hums, crackles, but there is no cold, the compressor may be jammed or a critical refrigerant leak has occurred. In such cases, operation of the device must be stopped immediately.
⚠️ Attention: Do not attempt to disassemble the compressor or open the piping system yourself. This requires special equipment and skills, and can also be life-threatening due to the high pressure and toxicity of some refrigerants.
It is also worth contacting a specialist if the cracking noise increases over time and begins to irritate even during the day. Sometimes the problem is solved by replacing shock-absorbing gaskets or reinstalling the compressor with new rubber bushings, which will extend the life of the unit.
Frequently asked questions (FAQ)
Why does a new refrigerator crack more than the old one?
New models often have more sealed cases and use new types of plastic that react more actively to temperature changes in the first weeks of operation. In addition, new compressors have parts that have not yet been ground in, which can create a little more noise. Usually, after 1-2 months of operation, the sounds become quieter.
Can a crackling sound be a sign of a freon leak?
A freon leak itself is often accompanied by a hissing or whistling sound. However, if a leak causes the compressor to run non-stop while trying to build up temperature, it may overheat. Overheating causes increased thermal expansion of parts, which can increase the cracking of plastic and metal.
Is it dangerous to continue using the refrigerator if it is cracking?
If the crackling is quiet, periodic and resembles clicks, it is safe. If the sound is loud, metallic, accompanied by vibration, smell or lack of cold, operation is dangerous and can lead to a fire or final breakdown of the unit.
How to reduce the noise from the refrigerator with your own hands?
Check the installation: align the legs, move them away from the wall, remove objects from above. Make sure that inside the chamber, bottles and containers do not touch the walls or rattle on the shelves. You can also check whether the pipes from behind are touching each other or the cabinet wall.