A sudden crackling sound in the refrigerator can unsettle any owner of household appliances. Just yesterday the unit worked quietly and unnoticed, but today it makes frightening sounds, reminiscent of gunshots or metal rubbing. Many users immediately panic, believing that an expensive device has completely failed and requires urgent replacement.
However, rumbles or clicks do not always indicate a critical breakdown. In some cases, these are natural physical processes occurring inside the chamber or in the cooling system. Understanding the nature of sound is the first step to saving your peace of mind and your wallet. In this article, we will look in detail at why a refrigerator is cracking, how to distinguish normal from pathology, and when you should really call a repairman.
The first thing to do when extraneous noise appears is to listen to the nature of the sound and the moment of its occurrence. The crackling noise can be intermittent, constant, or occur only when the engine is turned on and off. The diagnosis directly depends on this. Thermal expansion materials, problems with the fan or a malfunction of the start relay - all these reasons sound differently.
Natural sounds: thermal expansion and the physics of the process
Most often the question is “why is it cracking?” refrigerator" does not require the intervention of a service center. The main reason for sounds in new and properly working models is the physical law of thermal expansion. The inner walls of the chamber, plastic shelves and metal elements of the cooling system constantly change their temperature. When cooled, the materials contract, and when heated, they expand, which causes a characteristic crackling sound.
This process is most intense immediately after installing a new device or after defrosting. Plasticfrom which the internal panels are made, and aluminum tubes the evaporator have different expansion coefficients. When the compressor pumps refrigerant and the temperature drops sharply, tension occurs in the materials, which is released in the form of a click.
It is important to understand that such sounds are absolutely normal for most modern models, especially with the system No Frost. The sound usually resembles the crackling of wood in a fire or short clicks. It is not accompanied by chassis vibration or humming that goes beyond normal operating noise.
⚠️ Attention: If the crackling sound is accompanied by a burning smell or smoke, immediately unplug the device. This may indicate overheating of the wiring or melting of the insulation, which is a sign of a fire.
The intensity of such sounds depends on the quality of the build and the materials used. In budget models, the plastic may be thinner, which enhances the acoustic effect. Over time, when all the parts “grind” to each other, the frequency of clicks usually decreases, but may not completely disappear.
Problems with the compressor and start relay
If a crackling noise is heard in the lower part of the unit where the motor is located, you should pay attention to the operation of the compressor. This unit is the “heart” of the refrigerator, and any disturbances in its operation are reflected in the background sound. Often the cause of loud clicks during startup is the starting relay.
The relay is responsible for supplying voltage to the motor windings. If the contact is burnt or the mechanism is worn out, a loud click is heard when you try to start, after which the motor may not start or stop immediately. This is a defensive reaction of the system. In such a situation, the compressor tries, the relay clicks, but due to lack of startup, the cycle repeats.
Another reason is wear of the internal parts of the compressor itself. If you hear a metallic clanging or knocking sound, it may mean that valves or bearings have failed. In this case, the cracking will be accompanied by strong vibration and, possibly, a decrease in the quality of cooling.
- 🔊 A loud single click before starting the motor is a sign of a faulty start relay.
- 🔊 A metallic knock inside the motor-compressor is a symptom of mechanical destruction of the components.
- 🔊 Rhythmic crackling during operation is a possible sign of unstable voltage in the network.
For diagnostics, you can carefully (observing safety precautions) listen to the back of the refrigerator. If the clicks come specifically from the black “tank” of the compressor, the relay or the unit itself will probably need to be replaced. Self-repair of the compressor at home is impossible and requires special equipment for working with freon.
No Frost system and fan malfunctions
In models with automatic defrosting (No Frost), the fan is responsible for circulating cold air. If you hear a cracking sound that sounds like a propeller hitting something hard, this is most likely the problem. The blades may touch frozen ice or a foreign object.
Excessive ice often forms in the freezer. Pieces of ice may break off and fall into the fan rotation area. In this case, a characteristic crackling or buzzing sound is heard, which may appear or disappear. Also, the reason may be wear in the bearings of the fan itself - then the sound is more like a grinding sound.
Fixing the problem often requires completely defrosting the refrigerator. It is necessary to disconnect the device from the mains for 10–12 hours (minimum), leaving the doors open. This will allow the ice to completely melt and free up space for the blades to operate.
☑️ Actions in case of fan noise
If the sound returns after defrosting, it means the door seals are broken or the defrost sensor is faulty, causing ice to build up too quickly. In this case, a specialist diagnosis is required.
The influence of installation and external factors on noise
Sometimes the answer to the question “what is cracking” lies not inside, but outside. Incorrect installation is one of the most common causes of increased operating noise and vibrations that are perceived as crackling. If the refrigerator is not level, the compressor works with increased load, and the body resonates.
Check the adjusting feet. They should fit tightly on the floor, ensuring a stable position. If the floor is slippery (tiles, laminate), vibration can be transmitted to the base, causing rattling. It is also important to maintain the gaps between the walls of the refrigerator and the furniture.
External factors can also include:
- 🏠 Touching the rear radiator grille to a wall or cabinet.
- 🏠 The presence of foreign objects (bottles, cans) on the top panel or in a niche.
- 🏠 Weak fastening of internal shelves and drawers, which rattle from motor vibration.
Particular attention should be paid to the transportation bolts if the refrigerator is new. Although there are usually fewer of them in refrigerators than in washing machines, some compressor fastening elements may become fixed during transportation. If they are not removed during installation, vibration will be transmitted to the entire body.
⚠️ Attention: Do not install the refrigerator in a niche where the gap with the side walls is less than 5 cm. This leads to overheating of the compressor and increased noise due to poor ventilation.
Diagnostic table: determine the cause by sound
To make it easier for you to navigate the nature of the malfunction, we have compiled a summary table. It will help classify the sound and understand the approximate search vector for the problem.
| Sound type | Probable cause | Necessary actions | Urgency of repair |
|---|---|---|---|
| Short clicks when cooling | Thermal expansion of plastic | Observation, no intervention required | No |
| Loud click and silence | Faulty start relay | Relay replacement or compressor diagnostics | High |
| Propeller noise, friction | Ice on fan blades | Full defrost (12 hours) | Medium |
| Metallic knocking of the engine | Compressor wear | Replacement of the compressor | High |
| Whistling or hissing | Leakage freon | Searching for leaks and refilling | High |
Using this table, you can initially assess the situation. However, remember that auditory perception is subjective. What seems like a slight crackling to one may be heard by another as a threatening roar.
When a cracking sound is a sign of a serious breakdown
There are a number of symptoms that cannot be ignored. If a cracking sound in the refrigerator is accompanied by other alarming signs, operating the appliance becomes dangerous or useless. First of all, monitor the temperature in the chambers.
If you hear a crackling sound, but the food has stopped cooling, it means the cooling cycle is broken. This may be related to jamming of the compressor. The motor tries to start, the relay clicks, but the shaft stands still. In this case, the compressor can become very hot.
You should also be wary if the crackling noise appears after a power surge. The electronics may have failed, and now the control unit is sending incorrect signals to the actuators. In modern models with inverter compressors diagnosis is more difficult, since there is no classic relay with clicks, and noise can be produced by the control board.
Another critical point is the smell. A cracking sound combined with the smell of burning plastic or rubber indicates that overheating is occurring somewhere. The insulation of the wires may have melted or the motor winding has burned out.
Prevention and proper operation
To minimize the risk of extraneous noise and extend the life of the refrigerator, it is important to follow the operating rules. Regular maintenance helps identify problems at an early stage.
First of all, make sure the back of the condenser grill is clean. Dust and pet hair clog the cells, the motor overheats and works harder, which increases the noise. You need to clean the grille with a soft brush or vacuum cleaner every six months.
Secondly, do not overload the shelves. Heavy objects can deform the plastic guides, which will begin to crack due to thermal expansion. Distribute the load evenly.
The myth about lubrication
Some users try to lubricate the rubbing parts of the refrigerator with oil. This is absolutely not allowed! Oil can destroy plastic and rubber, and also create a fire hazard when in contact with electricity.
Thirdly, check the integrity of the seals. If the rubber on the door is torn or petrified, warm, moist air enters the chamber. This leads to increased ice formation and, as a consequence, fan noise and ice cracking.
Frequently asked questions (FAQ)
Why does a new refrigerator crack in the first days?
This is a normal process of adapting materials. Plastic and metal go through cycles of compression and expansion, “grinding in.” Usually, after 3-5 days of operation in normal mode, extraneous sounds disappear or become barely noticeable.
Is it dangerous if the refrigerator crackles and does not freeze?
Yes, this is dangerous for food and can lead to damage to the compressor. The combination of noise and lack of cold indicates a breakdown of the refrigerant circulation system or compressor failure. You need to turn off the device and call a technician.
Can I continue to use the refrigerator if it is cracking?
If the crackling is quiet and is associated with thermal expansion (clicking), you can use it. If the sound is loud, metallic, accompanied by vibration or smell, it is better to stop operation until the reasons are determined.
How to distinguish the sound of ice from a breakdown?
The sound of ice (drops, pouring) is usually heard inside the freezer and is chaotic. The sound of a breakdown (compressor, fan) is often rhythmic, tied to the engine switching cycles and comes from the technical area (bottom or rear wall).
Is it necessary to change the compressor if it starts to crack?
Not always. First you need to check the start relay and capacitor. Often replacing these cheap parts will fix the problem. The compressor is replaced only in case of confirmed mechanical destruction of its internal components.