A sudden crackling sound in the refrigerator can disturb the silence even in the quietest kitchen, forcing the owner to worry about the safety of food and the serviceability of equipment. Extraneous noise often becomes the first and only signal that changes have occurred in the operation of the unit that require attention. Loud sounds do not always mean a critical breakdown, but they cannot be ignored, since a malfunction noticed in time can save significant funds on repairs.
The nature of the sound can vary from a slight clicking sound to a loud, frightening crackling sound, similar to gunshots or metal rubbing. To understand why does the refrigerator crack?, it is necessary to analyze exactly when the sound appears: at the moment the engine starts, while it is running, or immediately after stopping. Owners often confuse natural physical processes with signs of breakdown, although in reality the situation may require only a simple adjustment of the position of the housing.
In this article we will analyze in detail the main reasons for the occurrence of acoustic anomalies in refrigeration equipment of various brands, such as Indesit, Bosch or LG. You will learn to distinguish harmless thermal expansion of materials from serious mechanical damage that requires the intervention of a specialist. Correct diagnosis at the initial stage will help you make the right decision on further actions.
Natural causes of crackling
The most common and absolutely safe cause of sounds is the thermal expansion of materials. Temperature changes constantly occur inside your refrigerator and freezer, causing plastic, metal, and other structural components to contract and expand. This process is accompanied by a characteristic crackling, which is especially noticeable in new models or after defrosting.
If you hear a crackling sound immediately after turning on the refrigerator or, conversely, after it has reached the desired temperature and the compressor has turned off, most likely it is a matter of physics. Plastic chamber walls, vegetable trays, and even interior lining can make sounds when their geometry changes by fractions of a millimeter. In most cases, this noise does not require any intervention and becomes quieter or disappears over time.
⚠️ Attention: If the cracking noise is accompanied by strong heating of the case walls or the appearance of a burning smell, this is no longer a natural process. In such a situation, it is necessary to immediately turn off the power to the device and check the wiring.
There is an opinion that older refrigerators should be quieter, but modern models with the system No Frost can make more sounds due to the complex air circulation system. However, even in classic models with drip defrosting, the sounds of expansion are clearly audible. It is important to listen: if the sound is rhythmic and quiet, similar to the cooling of metal, then you should not worry.
Problems with installation and external factors
Often the reason lies not in the insides of the unit, but in the way it is installed. An incorrect installation refrigerator can lead to vibrations that are transmitted to the floor, walls or nearby furniture, causing a resonating crackling sound. If the housing touches a wall or cabinet, any start of the compressor will be accompanied by rattling.
It is necessary to check the horizontal installation. If the refrigerator is not level, the door may not fit tightly or, conversely, put too much pressure on the seal, causing squeaks and clicks when opening. Adjusting the legs is a simple procedure that often fixes the problem without calling a technician. It is also worth inspecting the space around the equipment.
- 📏 Check the gap between the back wall of the refrigerator and the wall - it should be at least 5-7 cm for free air circulation.
- 🔧 Make sure that all shipping bolts and compressor clamps have been removed after delivery of the equipment.
- 🧱 Inspect the floor under the refrigerator - uneven covering or soft linoleum may increase the vibration of the case.
In some cases, it is not the refrigerator itself that makes a noise, but objects standing on its top panel. Bottles, jars or decorative elements begin to vibrate from the operation of the motor and hit each other. Remove all excess from the top cover and check if the sound disappears. If there is nothing on the top panel, check the shelves inside - a poorly secured glass shelf can also be a source of noise.
Malfunctions of the defrosting system and ventilation
In refrigerators with a system No Frost the fan is responsible for circulating cold air. If the fan blades become dirty or frozen, they may touch the housing walls or ice, producing a loud cracking and humming noise. This is one of the most common causes of noise in modern models, such as Samsung or Whirlpool.
The automatic defrosting system can also be a source of sounds. A heater element turned on to defrost the evaporator may crackle as it heats up, but if the sound is too loud, the defrost timer or sensor may be faulty. In this case, the ice may build up unevenly, and pieces of ice falling on the fan or heater will cause a knocking sound.
⚠️ Warning: Attempting to disassemble the No Frost system yourself without defrosting within 24 hours can lead to damage to plastic parts and fragile fan blades.
Diagnosis of this problem often requires partial dismantling the back wall of the freezer. A visual inspection allows you to see if there is ice on the blades and if they rotate freely. If the fan is jammed, replacing it will solve the noise problem and restore normal air circulation.
How to check the fan without disassembling?
Remove the back cover in the freezer (after defrosting the refrigerator). Manually twist the blade - it should rotate easily, without jamming or extraneous sounds.
Mechanical damage to the compressor and start relay
The compressor is the heart of the refrigerator, and its operation is not always silent. However, a loud metallic cracking or clanging sound when starting the engine often indicates serious problems. Wear of internal mechanisms, destruction of the compressor suspension, or problems with valves can cause metal to metal impacts.
Particular attention should be paid to the start relay. If, when you try to start, you hear a loud click, followed by a crackling sound and the motor stops, and then after a while the attempt is repeated, then the relay cannot start the compressor. In some cases, the relay can literally “shoot” or crackle due to overload or short circuit inside.
The table below will help systematize the symptoms and possible malfunctions of the motor group:
| Sound type | Moment of occurrence | Probable reason | Degree of danger |
|---|---|---|---|
| Loud clicking and buzzing | At startup | Malfunction of the starting relay | High (risk of motor burning) |
| Metal clanging | Constantly during operation | Destruction of the compressor suspension | Critical (needs replacement) |
| Periodic crackling | At the beginning and end of the cycle | Thermal expansion | Safe (normal) |
| Whistling and crackling | During operation | Freon leak or problem with fan | Medium (diagnostics required) |
If you hear the compressor trying to start, humming, crackling and turning off, do not leave the refrigerator plugged in for a long time. Working in this mode quickly disables the electric motor. Compressor repair at home is impossible, a qualified replacement of the unit is required.
The influence of refrigerant and pipelines
The movement of refrigerant through the system pipes can also be accompanied by sounds. Normally, this is a quiet gurgling or hissing sound, but if a plug has formed in the system or a leak has occurred, the nature of the sound changes. A cracking sound can occur due to water hammer when liquid freon enters the compressor instead of gaseous one.
Sometimes the crackling sound is produced by the copper tubes themselves, located on the rear wall of the unit. If they touch each other or the body of the refrigerator, vibration from the compressor causes them to knock. By carefully moving the tubes apart with your hand (only when the refrigerator is unplugged!), you can eliminate the contact and remove the sound.
☑️ Primary sound diagnostics
It is important to note that after filling the refrigerator with freon, the sounds may change. If the technician has overdone the amount of refrigerant, the load on the compressor will increase, and the noise of the unit will become more intense and alarming. In such a situation, a repeated call to a specialist is required to adjust the pressure in the system.
When it is necessary to call a specialist
There is a fine line between the permissible noise level and a sign of imminent breakdown. If cracking is accompanied by loss of cold, the appearance of ice in unusual places, or constant cyclic on-off switching, you cannot hesitate. Professional diagnostics in this case, this is the only way to preserve food and equipment.
A technician is needed if you cannot independently determine the source of the sound or if to eliminate the cause requires disassembling the case and using special tools. Independent intervention in a sealed circuit or high voltage electrical circuit is dangerous.
⚠️ Warning: Do not attempt to repair the compressor or freon circulation system yourself. This requires licensed equipment and skills, and a violation of the tightness of the circuit will lead to complete failure of the refrigerator.
A timely call to a specialist will help avoid costly repairs. Often, replacing one small part, such as a start relay or fan, is much cheaper than replacing a compressor or the entire unit if it burns out.
Prevention of noisy operation of the refrigerator
In order for your refrigerator to operate quietly and for a long time, it is important to follow the operating rules. Regular defrosting (for models without No Frost) prevents the build-up of a thick crust of ice, which can interfere with the operation of the mechanisms and cause a cracking sound when chipped. The cleanliness of the condenser on the rear wall also affects the efficiency and noise level.
Make sure that the food inside does not touch the rear walls of the chamber where the cooling system elements are located. Vibration can be transmitted to the packaging, causing an unpleasant noise. Correct loading chambers is the key to silence.
Periodically check the condition of the rubber seals on the doors. If they are dirty or damaged, the door may slam or squeak. Wipe the seals with a soft cloth and, if necessary, lubricate with silicone for elasticity.
The secret of silence
Install the refrigerator away from high-traffic areas and do not place heat sources (batteries, stoves) nearby, this will reduce the load on the compressor and reduce noise.
Why does a new refrigerator make noise? stronger than the old one?
Modern materials and more powerful compressors can create more noise at the start. In addition, in new units the “shrinkage” of parts has not yet occurred, and thermal expansion is more pronounced. Usually, after 1-2 months of operation, the sound becomes quieter.
Is it possible to lubricate the compressor if it crackles?
No, the compressor is a sealed unit that is not intended for user service. The lubricant is contained inside in a special oil. If the compressor is cracking due to mechanical wear, only replacing it will help.
Is it dangerous to continue using a cracking refrigerator?
If the cracking is caused by thermal expansion - no. If the sound is mechanical (metal on metal) or electrical (sparking), further operation may lead to a fire or complete breakdown of the unit. In doubtful cases, it is better to turn off the device.
How to distinguish the cracking of ice from a breakdown?
The cracking of ice is usually heard in the freezer, it is duller and occurs periodically when the No Frost system is operating. Mechanical failure is often accompanied by vibration of the case, humming and occurs in the lower part of the refrigerator, where the motor is located.
Does the voltage level in the network affect the noise of the refrigerator?
Yes, low voltage can make it difficult to start the compressor, causing the start relay to work with overload and make loud clicks or crackles. If the voltage in your network fluctuates, it is recommended to use a stabilizer.