A situation when a refrigerator makes a cracking sound can cause panic in any owner, especially if the equipment is new or has worked for years without complaints. Extraneous sounds are often perceived as a harbinger of a serious breakdown that requires expensive repairs or complete replacement of the unit. However, a cracking sound does not always indicate a critical malfunction; sometimes these are natural physical processes or simple installation errors.
In this article we will analyze in detail all the possible causes of the characteristic cracking sound in refrigeration equipment. You will learn to independently distinguish safe sounds from alarm signals that require specialist intervention. Understanding the nature of noise will help you save money and extend the life of your household appliances.
Natural sounds: thermal expansion of materials
The most common reason the refrigerator makes a cracking soundis the normal physical process of thermal expansion and contraction of materials. The inner walls of the chamber, tempered glass shelves and plastic elements are constantly exposed to temperature changes. When cooled or heated, materials change their size, which leads to sounds resembling clicks or crackles.
Such sounds are especially often observed in models with the system No Frost and in new refrigerators, where the plastic has not yet “got in.” Typically, a cracking noise occurs when the compressor stops or immediately after it starts, when the temperature difference is greatest. If the sound is heard rarely and is not accompanied by other symptoms, this is normal.
⚠️ Attention: If the crackling sound is heard very often, accompanied by vibration or buzzing, this may indicate deformation of the case or a violation of the geometry of the camera, which requires inspection.
It is important to listen to the nature of the sound. Natural expansion makes a dull, single click, while a mechanical problem often sounds like a series of rapid crackling sounds.
Installation problems and chassis vibration
Improper installation is a common culprit of noise that users mistake for internal failure of the unit. If The refrigerator is not level., vibration from a running motor is transmitted to the floor and walls, causing resonance and rattling. This not only creates discomfort, but also accelerates wear on the moving parts of the compressor.
Check the distance between the back wall of the device and the furniture or wall. The gap should be at least 5–7 centimeters for free air circulation. If there is insufficient clearance, hot air from the condenser heats surrounding objects, causing them to expand and a characteristic crackling sound.
To eliminate noise, you need to level the equipment horizontally using adjustable support legs. Use a spirit level for fine adjustments. Make sure that the refrigerator does not touch adjacent furniture or walls.
Malfunction of the defrost system (No Frost)
In models with an automatic defrost system No Frost crackling may be associated with the operation of the heating elements or fan. If too much ice accumulates on the evaporator, the ice may crack and fall onto the heater when defrost is activated. Under normal conditions, this process is quiet, but when icing occurs, the sound becomes loud and frightening.
Another source of noise in this system is the fan. If ice is frozen on the blades or dust gets into the bearing, the rotation becomes uneven, causing periodic cracking or humming. This requires defrosting the refrigerator within 24 hours.
If the sound returns after complete defrosting, the problem may lie in a malfunction of the defrost sensor or heating element. In such cases, the ice does not have time to melt completely, which leads to a constant increase in “fur coat” and contact of ice with moving parts.
Partial defrosting (for 2-3 hours) often does not solve problem, since ice remains in hard-to-reach places in the air ducts.
Mechanical damage and foreign objects
Sometimes the source of the crackling sound is trivial - a foreign object that has gotten into the operating area of the mechanisms. It could be a piece of ice that has broken off from the freezer, or a small part that has fallen behind the back panel. When the compressor or fan is running, an object gets into the mechanisms, causing a crash.
It is also worth checking the contents of the shelves. Glass bottles or jars, coming into contact with each other due to vibration, can make sounds very similar to the crackling sound of the unit itself. Make sure that the dishes are stable and do not touch the walls of the chamber.
Inspect the back wall of the refrigerator (from the motor side). Remove the protective panel (after disconnecting the device from the network) and check whether the condenser tube is touching the housing or other elements. Vibration can cause the tubes to hit the metal, creating a loud crackling sound.
Faults in the compressor and start relay
The most serious reason why the refrigerator makes a crackling soundlies in the heart of the unit - the compressor. If a crash is heard when you try to start the engine, followed by a click and silence, most likely the start relay has failed. It is responsible for starting the engine, and if it breaks down, it cannot turn the shaft, producing a characteristic sound.
Another option is wear of the internal parts of the compressor. If the engine has been running for many years, its suspension may have weakened, and during operation there is a knock on the walls of the casing. This is often accompanied by strong vibration.
Is it possible to change the relay yourself?
Replacing the starting relay is a technically simple procedure, requiring only a screwdriver and a new relay (matching the markings). However, if you are not confident in your abilities or the refrigerator is under warranty, it is better to call a technician so as not to damage the electrical contacts.
It is important to distinguish between the working hum of the motor and the emergency crackling noise. The operating sound is monotonous and smooth, the emergency sound is intermittent, with clicks or a metallic clang.
If the compressor crackles and does not start, further attempts to turn it on may lead to burnout of the motor winding. In this case, operation should be stopped before the technician arrives.
Diagnostic table: determine the cause by sound
To quickly understand why your unit is noisy, use the following table of sounds and probable causes.
| Sound type | When it occurs | Probable cause | Urgency of repair |
|---|---|---|---|
| Single click | When stopping/starting | Thermal expansion | Not required |
| Frequent crackling and buzzing | Constantly or cyclically | Incorrect installation, touching walls | Low (independently) |
| Crackling and clicking at startup | When the engine is turned on | Faulty start relay | High |
| Metal clanging | When the compressor is running | Suspension wear motor | Average |
| Crackling inside the chamber | Periodically | Ice on the fan (No Frost) | Medium (defrosting) |
This table is for reference only. An accurate diagnosis can only be made by a specialist after opening the unit and measuring the parameters of the electrical network.
When you need to call a specialist
There are a number of situations where independent actions can only aggravate the situation. If you observe a combination of a crackling noise with the cessation of cooling (products begin to deteriorate, the chamber is warm), this is a clear sign of a serious compressor failure or freon leak.
Also, professional help is needed if the crackling sound is accompanied by the smell of burning or melted wiring. In this case, you must immediately disconnect the refrigerator from the power supply and block children's access to the device.
⚠️ Attention: Do not try to disassemble the sealed circuit yourself or replace the compressor without special equipment. This is life-threatening and requires a license.
A timely call to a technician can often save the compressor by replacing only a cheap starting relay or thermostat, which will cost much less than replacing the entire motor.
Noise prevention and care of equipment
In order for your refrigerator to work quietly and for a long time, it is important to follow simple operating rules. Regularly wipe the door seals and check their tightness. A loose door causes the compressor to work more often, increasing the load on the mechanism.
Do not overload the shelves and ensure the even distribution of products. Heavy objects on the door can cause distortion and additional vibration when opening and closing.
☑️ Monthly check of silence
Compliance with the temperature regime also prolongs the life of the unit. Do not place hot food in the chamber and do not open the door more often than necessary.
Frequently asked questions (FAQ)
New is the refrigerator cracking - is this normal?
Yes, in the first weeks of operation, a new refrigerator may make various sounds, including crackling. This involves grinding in the internal parts, expanding the new plastic, and adjusting the thermostat. If after a month the sound does not disappear or gets stronger, you should contact the service.
The refrigerator only crackles at night, why?
At night, the overall noise level in the apartment decreases, and the sounds of equipment operation become more noticeable. In addition, at night the voltage in the electrical network may stabilize or, conversely, jump, which affects the operation of the motor. Also at night, the fast freezing mode is often turned on, which is noisier.
Is it possible to operate a cracking refrigerator?
If the cracking is caused by thermal expansion or vibration of the dishes, it is possible. If the sound comes from the motor (relay, compressor) and is accompanied by heating of the housing or lack of cold, it is better to stop operation before diagnosis in order to avoid a fire or complete breakdown.
Why did the old refrigerator start to crack?
Over time, the plastic dries out and becomes more fragile, increasing the sounds of expansion. The compressor suspension also wears out, the fan mounts become loose and gaps appear in the mechanisms that were not there before.
Does the voltage level in the network affect the crackling noise?
Yes, low or unstable voltage can make it difficult to start the compressor, causing the start relay to click more often than usual. To protect equipment in such conditions, it is recommended to use a voltage stabilizer.