The appearance of extraneous sounds in household appliances always causes concern among owners, especially if we are talking about refrigerator compartmentworking around the clock. If you hear your refrigerator making loud noises, it can be either a sign of natural physical processes or a symptom of a serious problem. The volume and nature of the sound often depend on the model of the unit, its age and the type of refrigerant used.
Modern devices are equipped with complex air circulation systems and new generation compressors, which can produce specific sounds that are not characteristic of older models. It is important to be able to distinguish normal operating noise from alarm signals indicating the need do-it-yourself repair or calling a technician. Ignoring critical sounds can lead to complete failure of the equipment.
In this article we will analyze in detail all the possible causes of the crackling sound, methods for diagnosing them and ways to eliminate them. You will learn when it is enough to just wait and when immediate intervention is required. Understanding the operating principles of compressor and the defrost system will help you maintain peace of mind and equipment.
Natural physical processes and the operation of the refrigerant
The most common reason that the refrigerator is cracking is the physical processes occurring inside the cooling system. When freon passes through the evaporator and condenser tubes, a sharp change in pressure and temperature occurs. The liquid, turning into gas and back, can create characteristic sounds reminiscent of gurgling or slight crackling. refrigerant (freon) through the evaporator and condenser tubes there is a sharp change in pressure and temperature. The liquid, turning into gas and back, can create characteristic sounds reminiscent of gurgling or light crackling.
Such sounds are especially often heard in models with a system No Frost, where the refrigerant circulates through more complex lines. Intense crackling in the first 10-15 minutes after starting the compressor is absolutely normal for most modern refrigerators. At this moment, the pressure in the system is equalized, and the metal elements of the tubes may be slightly deformed due to temperature changes.
If the crackling sound is heard chaotically and is not tied to the operating cycles of the motor, you should pay attention to the location device. Perhaps the vibration is transmitted to neighboring objects or the body itself resonates with the floor. In such cases, the sound may be amplified and appear louder than it actually is. Check the stability of the legs and the absence of contact with the furniture.
Operation of the automatic defrosting system
The second most common cause of cracking is the operation of the defrost system, especially in units that support the technology No Frost. Periodically, usually once or twice a day, the refrigerator goes into evaporator defrost mode. At this moment, the heating element (heating element) begins to heat up, and the ice accumulated on the radiator melts.
A sharp change in temperature causes thermal expansion and contraction of plastic parts, tubes and the evaporator itself. This results in a characteristic cracking sound that can be quite loud, especially at night. The sound is reminiscent of the crackling of cooling plastic or the bursting of ice. This process usually does not last long, from a few minutes to half an hour.
If a crackling noise is heard precisely at the moments when the compressor is turned off, and is accompanied by the sounds of dripping water, then this is a sure sign of normal operation of the defrost system. In this case, there is no need to worry, since this mechanism is necessary to prevent the formation of ice jams. However, if the sound becomes metallic or is accompanied by a burning smell, you should immediately check the heating element.
How to distinguish the sound of defrosting from a breakdown?
The sound of defrosting is usually dull, plastic, similar to the crackling of a fire or a cooling car engine. It is not chaotic, crushing in nature, like the knocking of metal parts.
Problems with the compressor and start relay
The most serious cause of noise is often the compressor heart itself of the refrigerator. If you hear a loud metallic knocking or cracking sound when you try to start the motor, followed by a clicking sound and silence, this indicates problems with the start relay or motor windings. The compressor tries to start, but due to a voltage surge or wear of parts, it cannot turn the shaft.
In older models of refrigerators with piston compressors, a cracking noise may indicate wear of the internal mechanical components. Pistons, valves and connecting rods wear out over time, and backlash appears, which creates a characteristic rumble. Inverter models compressors are quieter, but if the control electronics are faulty, they can also make strange sounds.
If the crackling noise comes directly from the motor and is accompanied by strong vibration of the housing, this may indicate destruction of the internal engine mount. In this case, the shock absorbers on which the motor is mounted cease to dampen vibration, and metal begins to beat against metal. Operating such a refrigerator is dangerous and can lead to complete jamming of the compressor.
Fan malfunctions in the No Frost system
In refrigerators with the system No Frost fans are responsible for circulating cold air. Over time, ice can build up on the fan blades or duct walls. When the blades begin to touch this ice, a characteristic cracking or grinding noise is heard. Typically, this sound intensifies when the refrigerator reaches temperature and dies down in standby mode.
Another reason may be wear on the fan bearings. If the rotation axis becomes distorted or the lubricant dries out, the rotating parts begin to vibrate and make noise. In some models, the fan may touch wiring or other structural elements if they have moved over time.
Diagnosing this problem often requires partial disassembly of the freezer or refrigerator. You should visually inspect the fan area for ice or mechanical obstructions. If the fan hums or crackles even without ice, it will most likely need to be replaced with a new one.
☑️ Fan diagnostics
External factors and incorrect installation
The source of the crackling noise is not always located inside the unit. Often the cause of extraneous sounds is improper installation or external factors. If the refrigerator is not level, its body may warp, which leads to deformation of the frame and the appearance of creaks and crackles due to thermal expansion. Adjusting the legs is the first place to start diagnosing.
It is also worth checking the distance to the walls and furniture. The gap should be at least 5-10 cm on all sides. If the refrigerator touches a wall, vibration from the running compressor will be transmitted to the surface, causing a resonant hum or crackling sound. In addition, objects standing on the lid of the refrigerator (vases, jars) may rattle due to vibration.
Pay attention to the internal contents. Bottles, cans or containers placed close to each other or against the walls of the chamber may bang when the fan or compressor is running. Simply adjusting the products is enough to eliminate this nuisance. Also check the shelves: if the glass does not lie tightly in the grooves, it may ring.
The influence of the floor on noise
If the floor in the room is wooden or has uneven surfaces, the vibration from the refrigerator may increase. Place anti-vibration pads or a piece of rubber under the legs.
Diagnostics and table of symptoms
In order to accurately determine the cause of the malfunction, it is necessary to carefully analyze the nature of the sound and the conditions for its occurrence. Below is a table that will help systematize the symptoms and understand what problem you are facing. This will help you make a decision: fix the problem yourself or call a specialist.
| Sound type | When it occurs | Probable cause | Degree of danger |
|---|---|---|---|
| Deaf crackling, clicking | Periodically, when compressor is turned off | Operation of the defrost system (No Frost) | Normal |
| Metal clanging | When the engine starts | Malfunction of the starting relay or compressor | High |
| Rattling, wind noise | Continuous or cyclical | Ice on the fan or bearing wear | Medium |
| Gurgling, hissing | Immediately after switching on | Refrigerant circulation through the pipes | Normal |
If you determine that the problem is of a technical nature, do not rush to completely disassemble the unit. First, try a simple diagnostic: unplug the refrigerator, wait 15-20 minutes and turn it on again. Sometimes electronics require a reboot to work correctly.
If you are not confident in your abilities, it is better to turn to professionals. Improper disassembly can lead to damage to the freon tubes, which will require expensive refilling and repairs.
When it is necessary to call a specialist
There are situations when it is no longer possible to ignore the problem. If the cracking sound is accompanied by a cessation of cooling, the appearance of ice in unexpected places, or the smell of burnt wiring, operation of the device should be stopped immediately. In such cases, delay can lead to a fire or complete failure of expensive components.
Also, the help of a specialist is necessary if the compressor needs to be replaced or refilled with freon. These works are performed only using specialized equipment and tools. Independent repair attempts in these cases are almost guaranteed to lead to final breakdown of the unit.
Do not forget that modern refrigerators are complex electronic devices. Errors in the control board can cause incorrect operation of all systems, including the motor and fans. Electronics diagnostics require special knowledge and testers.
⚠️ Attention: If you smell ozone or burnt plastic, immediately unplug the refrigerator and unplug the power cord. Further operation is prohibited to avoid fire.
Is it normal for a new refrigerator to crack in the first days of operation?
Yes, this is absolutely normal. New parts, seals and tubes should “grind in”. Thermal expansion of new materials may be more pronounced. Usually, after 3-5 days of operation, the sounds become quieter or disappear completely.
Can a crackling sound be a sign of a freon leak?
A freon leak itself rarely produces a loud crackling sound. However, if system pressure drops, the compressor may work overload in an attempt to compensate for the loss, causing louder noise. If the cracking sound is accompanied by the fact that the refrigerator has stopped freezing, check the tightness of the system.
Why did the old refrigerator begin to crack more than before?
Over time, the compressor shock absorbers wear out, and the plastic elements of the body and fasteners dry out. Mechanical components lose lubrication and develop backlash. Increased noise in an old unit is a sign of natural wear and tear, requiring prevention or replacement of worn parts.
Does the voltage level in the network affect the crackling noise of the refrigerator?
Yes, low or unstable voltage can cause humming and crackling of the compressor, which does not have enough power to start normally. In such cases, it is recommended to use a voltage stabilizer to protect equipment.
What to do if the crackling noise is heard only at night?
At night, the level of background noise in the apartment is minimal, so even quiet sounds become noticeable. If the crackling sound is rhythmic and coincides with the cycles of turning on the motor or defrosting, most likely this is an operating sound. Check to see if there are any objects on the refrigerator that may resonate.