Outsiders The sounds coming from a household refrigerator can unsettle any person. If the unit begins to crack, hum, or make clicking noises, this does not always mean a critical breakdown that requires an immediate call to a technician. Often vibration crackling is caused by completely natural physical processes or improper installation of the case. Understanding the nature of sound is the first step to solving the problem without extra costs.
In some cases, a crackling sound indicates that compressor is overloaded or one of the cooling system components has failed. It is important to learn to distinguish between normal operating noise and the sound of a malfunction. Below we will look in detail at why a refrigerator is cracking, how to carry out initial diagnostics, and in which cases repair is really necessary.
Natural causes of sounds
Many users get scared when they hear a sharp crack or click immediately after turning on the refrigerator or, conversely, after stopping it. Often such sounds are absolutely normal for most models, especially those equipped with the system No Frost. During operation, the refrigerant circulates through the tubes, changing its state of aggregation, which may be accompanied by characteristic gurgling or crackling.
One of the most common causes of cracking is thermal expansion of materials. The plastic elements of the inner lining and the metal tubes of the evaporator change their sizes when heated and cooled. This process may be accompanied by sounds resembling crackling or clicking sounds. If the sound is heard infrequently and is not accompanied by other symptoms, there is no need to worry.
It is also worth considering that new models of refrigerators may be more sensitive to voltage changes in the network. If the electricity in your home often jumps, protection relay it may work more often than usual, making clicking sounds. Old models are characterized by a hum, which may increase over time due to wear of parts, but periodic crackling often remains within the normal range.
⚠️ Attention: If the crackling sound occurs regularly and is accompanied by a lack of cold or a constant burning of the indication lamp, this may indicate an attempt to start a faulty compressor.
It is important to listen to the nature of the sound. Short, rare clicks following the hum of the motor usually mean the thermostat is turned on or off normally. However, if the crackling turns into a continuous hum or the sound becomes metallic and ringing, it is necessary to conduct a deeper check of the condition of the unit.
Installation problems and vibration of the case
Before looking for complex technical faults, you should eliminate trivial errors when installing equipment. If the refrigerator is not level, its body may resonate, increasing the vibration from the running compressor. This often results in the appliance starting to “dance” across the floor and making loud cracking or knocking noises against nearby objects.
Check the distance between the back wall of the refrigerator and the wall of the room. If the gap is too small, vibration is transmitted to the building structure, creating a drum effect. In addition, make sure that the housing itself does not touch walls, furniture or heating pipes. Even a light touch can cause a continuous rattling sound.
- 🔨 Check the adjustment feet: they should fit snugly to the floor, ensuring stability.
- 📏 Move the equipment away from the wall at least 5-10 cm for free air circulation.
- 🔍 Inspect the space around: make sure that nothing touches the body.
Often the cause of noise is not the refrigerator itself, but objects located inside or on its lid. Bottles, jars or dishes may touch each other and vibrate. It is also worth checking whether objects have fallen behind the refrigerator, where they could have rolled during cleaning or operation.
Malfunctions of the No Frost defrosting system
In refrigerators with a system No Frost one of the sources of noise may be the defrost system. During operation, ice forms on the evaporator, which is periodically removed by a heating element (heating element). With a sharp change in temperature, the ice may crack, producing loud sounds similar to gunshots or a strong crack.
However, if the cracking becomes constant and is accompanied by the fact that the refrigerator has stopped freezing, the problem may lie in a malfunction of the defrost timer or the heating element itself. If the heating element does not turn off in time or does not work correctly, this can lead to deformation of the plastic elements and a characteristic sound.
Another cause of noise in the system No Frost is the fan. If ice has formed on its blades or it is contaminated with dust, when rotating it may touch the walls of the housing or the plastic casing. This causes a rhythmic crackling or humming noise, which intensifies when the motor is running.
| Symptom | Possible cause | Character of the sound |
|---|---|---|
| Crackling during defrosting | Ice cracks on evaporator | Loud clicks, similar to gunshots |
| Constant hum | Fan malfunction | Uniform noise with periodic friction |
| Clicks when switching on | Relay activation | Short, loud click |
| Metal clanging | Foreign object hit | Chaotic knocking inside the chamber |
To diagnose the fan, partial disassembly of the rear panel of the freezer is often required. If you do not have the skills to work with electrical appliances, it is better to entrust this procedure to a specialist, as there is a risk of damaging fragile plastic fasteners or breaking the tightness of the system.
Wear and breakdown of the compressor
The compressor is the “heart” of the refrigerator, and it is it that most often becomes the source of noise in the event of serious malfunctions. If the device begins to crack, hum stronger than usual, or make sounds reminiscent of a tractor, this may indicate wear and tear on the internal mechanisms of the motor-compressor.
One of the common problems is wear compressor suspension. The motor is mounted on springs or rubber shock absorbers that dampen vibration. Over time, the rubber dries out and the springs may weaken or burst. As a result, the compressor housing begins to hit the metal casing or frame of the refrigerator every time it starts.
An even more serious situation occurs when the valve group inside the compressor breaks down. In this case, the unit may make loud metallic knocks, and the pressure in the system will be insufficient for normal cooling. Refrigerant In this case, it does not circulate correctly, which is often accompanied by a whistle or hissing.
Is it possible to replace the compressor yourself?
Replacing a compressor is a complex technical process that requires special equipment (vacuum pump, burner, pressure gauges) and skills in working with freon. Self-replacement without unsoldering the system and vacuuming will lead to rapid breakdown of the new motor.
If you hear that the compressor is trying to start, makes a click and immediately stalls, and after a while the cycle repeats, this is a sign of a malfunction of the start relay or the motor itself. It is impossible to operate the refrigerator in this mode - this can lead to burnout of the motor winding.
Pipeline defects and refrigerant circulation
Sometimes crackling and gurgling are caused by the peculiarities of the movement of freon through the pipes. If an air pocket has formed in the system or the proportion of refrigerant is disturbed, the circulation sound becomes louder and more distinct. This often happens after poor-quality repairs, when the technician did not remove air from the system before refueling.
The pipes leading to the compressor should not touch each other or the refrigerator body. The vibration of a running motor is transmitted to the pipeline, and if it is not firmly secured or has moved during transportation, rattling begins. This can be easily fixed by carefully straightening the tubes by hand (with the device unplugged) and installing rubber gaskets between them.
In older models with a crying evaporator, the capillary tube often cracks. When freon passes through a narrow section of the capillary, a sharp pressure drop occurs, which may be accompanied by sounds. If the tube is pressed against the wall of the chamber, this sound is amplified.
It is important to note that the capillary tube is very thin and fragile. Damage to the capillary tube or violation of its tightness leads to complete release freon and the impossibility of further operating the refrigerator without expensive repairs. Therefore, carry out any manipulations with the tubes with the utmost care.
Diagnostics and checklist of actions
To accurately determine the cause of the noise, it is necessary to carry out consistent diagnostics. Don't immediately disassemble the refrigerator; start with simple steps that will help localize the source of the problem. In most cases, the cause can be found visually or by ear.
First, listen to where exactly the sound is coming from: from below where the motor is located, from inside the freezer, or from behind the unit. Try to lightly press the side walls or the top cover with your hand - if the sound changes or disappears, the problem is the vibration of the case.
☑️ Diagnosis of refrigerator noise
If simple methods did not help, you can try to temporarily disable the system No Frost (if there is such a button) or defrost the refrigerator completely, leaving it turned off for a day. This will help you understand whether the crackling noise is associated with ice on the evaporator or the operation of the fan.
In the case when you find that the crackling noise comes directly from the compressor and is accompanied by heating of the motor housing or lack of cold, further self-diagnosis can be dangerous. It is better to contact professionals to measure the pressure in the system and check the electrical parameters.
⚠️ Attention: Never try to repair the electrical part of the compressor or change the start relay without first disconnecting the device from the power supply. Residual voltage can be dangerous.
Frequently asked questions (FAQ)
Why does the refrigerator crack only at night?
At night, the overall noise level in the apartment decreases, and you simply begin to better hear the normal sounds of the unit: gurgling freon, clicking thermostat or humming compressor. Also, at night, the voltage in the network may drop, which affects the operation of the motor.
Is it dangerous if the refrigerator crackles and does not freeze?
Yes, this is dangerous for the food and the appliance itself. The combination of extraneous sounds and lack of cold indicates a serious breakdown, for example, a freon leak, a clogged capillary, or a compressor malfunction. Food may spoil and the motor may burn out.
Can a new refrigerator make noise?
Yes, new refrigerators can make sounds during the “break-in” period. Grinding in of parts and expansion of new materials takes place. However, a loud metallic knock or continuous cracking noise is not typical for new equipment and requires checking.
How to reduce the noise of an old refrigerator?
Try to level the appliance, place anti-vibration pads under the legs, and move it away from the wall. If the compressor is noisy, you can check the integrity of the rubber shock absorbers on which it is mounted and replace them if necessary.