A sudden crackling sound in the refrigerator can unsettle any owner, especially if the unit has been operating quietly for many years. Often this sound occurs at moments when there is silence in the house, and it seems that something fatal is happening to the equipment. However, there is no need to panic ahead of time, since many noises are normal for the operation of modern equipment.
Understanding the nature of sound is the first step to solving the problem, allowing you to distinguish a harmless thermostat click from a serious breakdown. compressor. In this article, we will analyze in detail the physical and mechanical causes of the crackling noise, so that you can carry out the initial diagnosis yourself. You will learn in which cases it is enough to just wait, and when you need to call a specialist.
It is worth noting that the nature of the sound can change dramatically depending on the model of your device. For example, Samsung and LG often use specific materials for internal chambers that react differently to temperature changes. Let's figure out what exactly is hidden behind this unpleasant acoustic effect.
Natural physical processes: thermal expansion
The most common and absolutely safe cause of cracking is a physical phenomenon known as thermal expansion of materials. The internal chamber of the refrigerator, made of plastic or thin metal, is constantly exposed to sudden temperature changes. When unit turns on and begins to cool the space, the walls compress, and when turned off, they expand.
These microscopic deformations are accompanied by a characteristic sound, reminiscent of crackling frost or clicks. This is especially common in newer models, which use thinner and lighter insulating materials to improve energy efficiency. If your refrigerator Bosch or Indesit makes such sounds immediately after the motor stops, this is a normal reaction of the design.
The intensity of the noise depends on several factors, among which are:
- 🧊 Internal lining material (ABS plastic cracks louder metal).
- ❄️ Temperature difference between the on and off states.
- 🏗️ Build quality and tightness of the body panels.
- ⏳ Age of the device (old plastic becomes more fragile).
Why new refrigerators noisier?
Modern models often have thinner walls to increase useful volume with the same dimensions. This makes the structure more susceptible to temperature deformations, hence the characteristic crackling sound, which was not present in old Soviet units with a thick layer of insulation.
If the crackling sounds evenly and stops a few minutes after the compressor stops, then intervention in the operation of the equipment is not required. This is a normal operating mode that you will have to put up with or just get used to. However, if the sound becomes shrill or accompanied by vibration, you should listen more carefully.
Operation of the defrost system and heating element
The second most common cause of strange sounds is the defrosting cycle, especially in models with the system No Frost. In such refrigerators, the heating element (heater) is periodically turned on to melt the ice on the evaporator. The sudden heating of cold pipes and plastic elements of the drainage system causes a characteristic hissing and crackling sound.
Often users confuse this sound with a malfunction, but in fact this indicates the correct operation of the automation. The sound may be similar to frying eggs or light shooting. In brand devices Atlant or Stinol this process can be heard more clearly due to the design features of the internal unit.
⚠️ Attention: If, along with the crackling noise, you smell the smell of burnt wiring or scorched plastic, immediately turn off the power to the refrigerator. The noise from the heating element should not be accompanied by foreign odors.
It is important to distinguish between the sounds of a working heating element and problems with the fan. If the cracking turns into a hum or grinding noise, the fan blades may be touching ice that has not yet melted. In this case, the defrost system may not work correctly, requiring a check defrost sensor or the heater itself.
Mechanical compressor malfunction
The situation becomes more serious if the source of noise is the compressor motor. A working unit operates with a smooth, monotonous hum. If you hear a metallic clang, frequent crackling sounds, or sounds similar to the rolling of nuts inside the motor housing, this is an alarming signal. Such symptoms often indicate wear of internal mechanisms or problems with the suspension of the compressor.
The compressor is mounted on special shock-absorbing springs that dampen vibrations. Over time, the metal of the springs can tire or they can become misaligned, causing the motor housing to touch the tubes or casing walls. It is this metal-to-metal contact that, when vibrating, produces a loud, unpleasant crackling sound.
You can diagnose the problem by carefully (and carefully so as not to get burned) by touching the body of the refrigerator at the moment the sound appears. If the vibration is transmitted very strongly to the housing walls, most likely the problem is in the motor mounting. In more complex cases, for example, in models Liebherr with inverter compressors, a crackling noise may indicate a malfunction of the control electronics or the starting relay.
| Sound type | Probable cause | Urgency of repair |
|---|---|---|
| Rare clicks when starting/stopping | Thermal relay or expansion | Not required |
| Metallic clanging inside the motor | Destruction of the piston group | High |
| Vibration of the housing with a crackling | Touch of the compressor on the casing | Medium |
| Crackling + buzzing without cooling | Seizing compressor | Critical |
If the compressor makes sounds similar to gurgling fluid combined with a cracking sound, this may mean that the refrigerant is circulating at the wrong pressure. In such cases the refrigeration circuit may be damaged or clogged, which requires professional diagnostics with a pressure gauge.
Problems with the fan in the No Frost system
In refrigerators with automatic defrosting, the fan is responsible for circulating cold air. If its blades are contaminated with dust or ice has frozen on them, the balancing is disrupted. As a result, the fan begins to vibrate and make a cracking sound, which is transmitted through the plastic air ducts, amplifying as in a resonator.
Often, foreign objects, such as a piece of ice or a product label, can get into the rotation zone of the blades. This causes an intermittent crackling noise that comes and goes. To test this hypothesis, you need to get to the evaporator, which in some models requires partial disassembly of the rear wall of the chamber. Samsung or LG requires partial disassembly of the rear wall of the chamber.
Lubricating the fan bearing is another solution if wear is the issue. However, if the bushing has worn out its life, it is easier to replace the entire assembly. Please note that operating the fan without lubrication can lead to jamming and burnout of the windings.
☑️ Fan diagnostics
External factors and installation
Sometimes the cause of the crackling noise lies not at all inside the unit, but in its operating conditions. If the refrigerator is not installed level, vibration from the running compressor is transmitted to the floor or walls, causing resonance of nearby objects. Even a slight touch of the refrigerator body against a kitchen cabinet or wall can cause a loud knock.
Check whether the equipment is stable. Shake the refrigerator - it should not wobble. Height adjustment is made using the front support legs. It is also worth moving the unit away from the wall to prevent the transfer of vibration to building structures.
External factors also include:
- 📦 Closely standing bottles or cans on shelves that rattle from vibration.
- 🔌 Loose fit of the plug in the socket (may produce an electrical crackling sound).
- 🐜 Presence of insects inside the technical compartment (rare, but it happens).
- 🧱 Uneven floor causing frame distortion.
⚠️ Attention: Make sure that there is a minimum gap between the back wall of the refrigerator and the kitchen wall 5-7 cm for normal air circulation. Overheating of the condenser can increase the noise of the system.
When you need to call a technician
There are a number of signs, ignoring which can lead to expensive repairs or complete loss of products. If the crackling sound is accompanied by an increase in temperature in the chambers, this indicates that the refrigeration unit has ceased to perform its function. The compressor may hum and crackle, trying to start, but not create the necessary pressure. refrigeration unit stopped performing its function. The compressor may hum and crackle as it tries to start, but may not produce the required pressure.
Another critical symptom is the appearance of oil around the compressor or on the floor under the refrigerator. This indicates a depressurization of the system. Also, you should be wary of the frequent turning on and off of the engine (clocking), accompanied by loud clicks of the relay.
In the following cases, independent repair is dangerous or impractical:
- 🔥 The appearance of sparks or a burning smell from the engine compartment.
- 💧 Detection of a refrigerant leak (oil stains).
- 🔊 Loud metallic knock, similar to hammer blows.
- ❄️ Complete absence of cold when the engine is running.
Prevention and care of equipment
To minimize the risk of extraneous noise, it is important to follow the operating rules. Regular defrosting (for drip systems) and cleaning the drainage hole will prevent the formation of excess ice, which often causes cracking. Do not overload the shelves, as this creates additional stress on the structure.
Keep the condenser (grid at the back of the refrigerator) clean. Dust and animal hair impair heat transfer, causing the compressor to work longer and harder, which accelerates its wear. Wipe the grilles with a vacuum cleaner or brush once every six months.
Remember that proper installation is the key to quiet operation. Use a building level during installation. If the floor in the kitchen is old and wooden, you can place special anti-vibration pads made of thick rubber under the support legs.
Can a crackling sound be a sign of electronic failure?
Yes, in modern models with electronic control, a crackling sound can come from the control board if there is a breakdown on it or any element is faulty. This is usually accompanied by display errors or function failure. In such cases, the control module needs to be replaced.
Why does the refrigerator only crack at night?
At night, the overall noise level in the apartment decreases, and sounds that are unnoticeable during the day become audible. In addition, at night the voltage in the network often drops, which can change the nature of the compressor’s operation, making it noisier.
Is cracking noise dangerous for food?
Sound itself does not spoil food. What's dangerous is what's behind the sound. If the cracking noise means a compressor breakdown or loss of freon, then the temperature in the chamber will begin to rise, which will lead to spoilage of supplies. Therefore, it is important to find out the reason.
How long can a new refrigerator crack?
The period of “grinding in” of new materials can last from several days to 2-3 weeks. If during this time the noise intensity does not decrease, you should contact a service center to check the quality of the assembly.