A sudden crackling sound in the refrigerator can scare any owner, because this sound is often associated with the breakdown of an expensive unit. Kitchen appliances must operate virtually silently, so any deviation from the usual hum requires attention. However, you should not immediately panic and call a technician, as in some cases a characteristic crackling sound is normal.
Understanding the nature of the sounds made by your device will help save time and money. Crackling noise in the refrigerator can be caused by both natural physical processes and serious malfunctions of internal components. In this article, we will analyze in detail all possible causes, from harmless to critical, and determine when repairs are really necessary.
It is important to immediately note that diagnosis begins with careful listening. The nature of the sound, the frequency of its occurrence and accompanying symptoms (for example, lack of cold or ice) provide a clue. Let's look at the main scenarios why your unit began to make extraneous sounds.
Natural physical processes during operation of equipment
The most common and absolutely safe cause of cracking is the thermal expansion of materials. The inner walls of the chamber, the evaporator and other structural elements are made of plastic and metal, which have different expansion coefficients. When temperature changes sharply in cycles of turning the compressor on and off, materials are deformed at the microscopic level, producing characteristic clicks.
This sound is especially often heard in new models or after long-term defrosting. Plastic panels there may be react to cold air coming from the No Frost system. If the cracking noise is heard irregularly and is not accompanied by other problems, then this is a normal situation.
Why do new refrigerators crack louder?
New models often have denser insulation and modern composite materials, which can make sounds during the first “shrinkage” and temperature adaptation in the first weeks of operation.
In addition, the refrigerant circulating through the tubes can also create gurgling or crackling sounds, especially as it passes through the capillary tube or with a sudden change in pressure. This is the physics of operation of the refrigeration circuitwhich cannot be completely eliminated.
Problems with the defrosting system and ice
If cracking has become a constant companion to the operation of the unit, it is worth checking the melt water drainage system. In models with automatic defrosting (No Frost) or Low Frost), water flows into a special tray above the compressor. If the drain hole becomes clogged with food crumbs or ice, the water begins to freeze, forming massive ice build-ups.
When the compressor is running, these blocks of ice can crack, creating a loud crunching sound. Ice can also block the operation of a fan or damper, which leads to mechanical friction and a characteristic sound. Ice on the evaporator is the first sign that the defrosting system is not working correctly.
⚠️ Attention: If you notice that the back wall of the chamber is completely covered a “coat” of ice, and puddles periodically appear under the refrigerator, immediately stop using it and carry out complete defrosting.
To eliminate the problem, it is often enough to defrost the device for 24 hours. However, if after switching on the ice appears again after a few days, the reason lies deeper: the timer or defrost sensor may have failed. The defrosting heating element, timer or defrost sensor.
☑️ Diagnostics of the defrosting system
Faults of the compressor and start relay
The heart of the refrigerator - the compressor - emits a smooth hum during normal operation. If you hear a loud metallic cracking, clicking or buzzing noise that ends abruptly, this is a warning sign. Often the problem lies in the starting relay, which is responsible for starting the engine.
When the relay contacts oxidize or the mechanism itself wears out, it cannot start the engine correctly, producing a series of rapid clicks. This is an attempt starting device to work, which ends in failure. In this case, the compressor may not even start, or may operate with strong vibration.
A more serious situation is wear of the internal components of the compressor itself. If the piston group is worn out, metallic knocking and friction occurs. Operation in this mode will quickly lead to jamming of the motor and expensive repairs.
| Sound type | Probable cause | Need for repair |
|---|---|---|
| Rare clicks | Thermal expansion | Not required |
| Frequent crackling sound when starting | Start relay | Replacing the relay |
| Metal clanging | Wear compressor | Replacing the compressor |
| Buzzing noise | Vibration of the housing/pipes | Position adjustment |
Fan and air circulation in the chamber
In system refrigerators No Frost a fan is responsible for circulating cold air. If a crackling sound appears in the freezer, reminiscent of the sound of a working propeller, which either subsides or intensifies, most likely this is the problem.
Over time, ice may freeze on the fan blades or on the axle. The blades begin to touch the ice crust or the walls of the air duct, making a cracking sound. Also, the cause may be dried up grease in the fan motor bearing.
To solve the problem, you often need to remove the back panel in the freezer, defrost the evaporator and clean the space around the fan. If the fan motor is out of order and emits a burning smell or does not spin at all, it will need to be replaced with a new one.
Vibration and contact of tubes with the body
Sometimes a crackling sound is the result of simple vibration. The copper tubes through which freon circulates are located in close proximity to each other and from the walls of the housing. During operation, the compressor vibrates, transmitting vibrations to the pipelines.
If the tubes come into contact, they begin to rattle and crack against each other. Vibration can also be transmitted to shelves, dishes, or the refrigerator body itself if it is not level. Compressor vibration is a powerful source of noise that needs to be localized.
Check the adjusting supports. If the refrigerator is not stable, rocking when the motor is running will cause knocking and cracking noises. Tighten the legs so that the unit stands solidly.
When you need to call a specialist
Despite the possibility of self-diagnosis, there are situations when professional intervention is inevitable. If the cracking sound is accompanied by an increase in temperature in the chambers, the appearance of an unpleasant odor, or if the compressor runs non-stop, call a specialist without delay.
Complex breakdowns, such as freon leakage, clogged capillary system or failure of electronics, require special equipment for diagnosis and repair. Attempts at self-repair in these cases may lead to permanent breakdown of the unit.
⚠️ Attention: If you smell burning conductivity or see sparking in the area of the start relay, immediately unplug the refrigerator and do not try to turn it on again until the technician arrives.
Also, the help of a technician is needed if, after defrosting and checking all available components, the cracking does not disappear. This may indicate a hidden defect, which is visible only after complete disassembly and the use of special tools.
Noise prevention and proper operation
In order for your refrigerator to serve for a long time and quietly, it is important to follow the operating rules. Regular defrosting (even for systems No Frost it is recommended to do this once a year) will prevent the formation of excessive ice and overload of the compressor.
Keep the condenser at the back of the refrigerator clean. Dust and pet hair stuck to the grille impair heat transfer, causing the motor to work harder and noisier. Wipe the door seals so that they do not lose their elasticity.
How often should you wash the condenser?
In houses with animals - every 3-4 months; under normal conditions, one cleaning per year is enough.
Do not place the refrigerator close to the wall. A gap of 5-10 cm is necessary for normal air circulation and prevention of overheating, which also affects the noise level and the nature of the unit’s operation.
Why does the refrigerator crack immediately after turning on?
Most often this is the sound of thermal expansion of plastic and metal, as well as the sound of the compressor starting and the refrigerant beginning to move through the system. If the cracking lasts a couple of seconds and stops, this is normal.
Is it dangerous if an old refrigerator cracks?
In older models, wear of mechanical parts (compressor, fan) is more likely. A cracking noise may indicate that the unit's life is coming to an end, and it is worth preparing to replace parts.
Can an empty refrigerator crack?
Yes, an empty refrigerator may even crack more strongly due to the lack of products that serve as cold accumulators and stabilize the temperature, reducing the frequency of on-off cycles.
What to do if a cracking sound appears after defrosting?
Let the refrigerator operate for several hours. Residual moisture in insulation or drainage can freeze and crack. If the sound does not go away for a day, check if the drainage has frozen.