Suddenly appearing stranger The sound of kitchen appliances can unsettle any owner, especially if it is accompanied by a rhythmic crackling sound. Many users immediately begin to panic, assuming the imminent demise of the expensive unit, but there is no need to rush to conclusions. In most cases, such sounds indicate completely natural physical processes occurring inside the cooling system and do not require the intervention of a technician.
However, persistent noise also cannot be ignored, as it may indicate an imbalance, problems with the compressor fastening, or a malfunction of electrical components. Understanding the difference between a working hum and an alarming rattle can save you time and money. In this article, we will analyze in detail the mechanics of the occurrence of sounds and determine when it is really time to sound the alarm.
Natural physical processes: expansion and compression
The most common reason why refrigerator crackinglies in banal physics. The internal walls of the chamber, the evaporator and other elements of the system are made of materials with different coefficients of thermal expansion. When there is a sudden change in temperature, for example, immediately after turning off the compressor or when loading warm products, plastic and metal begin to contract or expand.
This process is accompanied by characteristic clicks and crackling sounds, which often frighten inexperienced users. The sounds can be quite loud, especially on models with plastic inner chamber linings. As a rule, such “conversations” of equipment do not last long and fade away as the temperature stabilizes.
It is important to note that the intensity of the sounds depends on the quality of the build and the materials used. In cheaper models, the gaps between parts may be larger, which increases resonance. If the crackling noise is heard irregularly and coincides with the moments when the motor is turned on or off, then this is a normal situation for most modern refrigeration units..
How to distinguish a natural crackling sound from a breakdown?
Natural crackling noise is usually heard in short series and stops within 1-2 minutes after turning it on or off compressor. If the sound continues constantly while the motor is running, or is accompanied by vibration of the housing, the reason lies deeper.
Problems with the compressor and its mounting
The compressor is the heart of the refrigerator, and it is it that creates the main vibration during operation. If the unit begins to make a loud cracking sound, buzzing or knocking, the first thing to check is the mounting of the motor itself and the shock absorbers. Over time, rubber gaskets may dry out, lose elasticity, or even fall out of place.
As a result, the metal housing of the compressor begins to touch the tubes or walls of the refrigerator body, causing loud noise. The cause may also be a loose fastening of the casing that protects the rear of the unit. For diagnostics, it is often enough to simply lightly press on the body of a running motor (observing safety precautions!) or tighten the mounting bolts.
In some cases, a cracking sound may indicate wear on the internal parts of the compressor, for example, bearings or valves. If you hear metallic clanging or grinding noises that get worse over time, this is a bad sign. In such a situation compressor repair it may not be practical, and it is easier to replace the entire assembly.
Faults in the No Frost system and fan
In models with the system No Frost the fan is responsible for circulating cold air. If you hear a cracking sound, similar to the sound of bursting plastic or the impact of blades, the problem may lie in this unit. Often the cause is ice freezing on the blades or fan hub, which leads to imbalance and beating.
Another common reason is the entry of a foreign object into the rotation zone of the blades or the misalignment of the fan itself due to wear of the bearings. In this case, the crackling sound will be accompanied by a characteristic hum. To eliminate the malfunction, it is often necessary to defrost the refrigerator for 24 hours so that the ice completely melts.
If the sound returns after complete defrosting, it means that the problem is mechanical wear. In some models, the fan is located in a hard-to-reach place, hidden behind plastic panels. Disassembling such units requires care, as the plastic latches can be fragile.
- 🔍 Check whether ice has frozen on the fan blades.
- 🔍 Make sure that the wires do not touch moving parts.
- 🔍 Assess the smoothness of the shaft rotation manually (with the power supply).
The influence of improper installation and alignment
Often the answer to the question of why the refrigerator is cracking lies not in the breakdown, but in the incorrect installation. If the unit is not level, vibration from the operating compressor is transmitted to the floor and walls, causing resonance. This can create the feeling that the body itself or the internal shelves are cracking.
This problem is especially relevant for refrigerators with two compressors or powerful motors. Even a slight repainting can cause the door to fit loosely and increase vibration. Adjusting the legs is the first thing you need to do before calling a technician.
⚠️ Attention: Make sure that the refrigerator is not standing close to the wall or furniture. A gap of 5-10 cm is necessary for normal air circulation and to prevent vibration resonance.
☑️ Diagnostics of refrigerator installation
Electrical reasons and start relay
Sometimes the crackling sound is electrical in nature. One suspect is the compressor start relay. If the contacts inside the relay are burnt or oxidized, when you try to start the engine, a characteristic click or crackling sound may be heard, after which the compressor hums, but does not start, or turns off immediately.
The thermostat may also be the source of the sound. When opening and closing contacts inside the thermostat, a click is also heard, but it is usually quiet and single. A loud crack may indicate an insulation breakdown or poor contact in the electrical circuit, which is dangerous and requires immediate disconnection of the device from the network.
Diagnostics of the electrical part requires a multimeter and skills in working with electrical appliances. If you are not confident in your abilities, it is better not to take risks. A faulty relay can often be replaced independently by selecting an analogue according to the markings, but this requires disassembling the rear part of the unit.
| Sound type | Probable cause | Urgency of repair | Can I fix it myself |
|---|---|---|---|
| Rare clicks when turned off | Thermal expansion of materials | Not required | Yes (not necessary) |
| Constant crackling + humming | Fan No Frost | Medium | Yes (defrost) |
| Loud knocking/clanging | Compressor or shock absorbers | High | Partially (shock absorbers) |
| Click and silence | Start relay | High | Yes (relay replacement) |
When you need to call a specialist
Despite the possibility of self-diagnosis, there are situations when you cannot do without a professional. If the cracking noise is accompanied by a loss of cooling, a burning smell, or visible sparks, the appliance must be used immediately. Attempts at further use may lead to a fire or complete failure of the expensive compressor.
A specialist’s help is also needed if the compressor needs to be replaced or the refrigerant circulation system needs to be repaired. These works require special equipment, evacuation of the system and injection of freon. Independent intervention in a sealed circuit without a license and tools often leads to final failure.
In addition, if your refrigerator is under warranty, any independent repair will lead to its loss. In this case, even replacing a light bulb or adjusting the legs is best done in the presence of an authorized technician or after consultation with a service center.
⚠️ Attention: If you smell burnt wiring or see smoke, immediately remove the plug from the socket. Do not try to look for the cause of sparking inside the switched-on device.
Prevention and care of equipment
To minimize the risk of extraneous noise, it is important to follow the rules operation. Regular defrosting (for drip systems) prevents excessive ice build-up, which can interfere with the operation of the mechanisms. You should also periodically check the cleanliness of the condenser on the back wall, as dust impairs heat transfer and causes the compressor to work harder.
Do not overload the shelves and make sure that the products do not touch the back wall of the chamber where the evaporator is located. This will not only cause a cracking sound when frozen, but can also damage the thin pipes of the cooling system. Proper loading also promotes uniform air circulation.
Timely replacement of door seals will help avoid unnecessary load on the compressor. If the door does not fit tightly, the cold leaves, the temperature inside rises, and the motor is forced to work almost without interruption, which reduces its life and increases the noise level.
Is it normal if a new refrigerator cracks in the first days?
Yes, this is absolutely normal. New materials have not yet “got used to it”, and expansion-compression processes may be more pronounced. In addition, the shipping bolts (if they were on the compressor) must be removed before turning on for the first time.
Can a crackling sound be a sign of a freon leak?
A freon leak itself is usually silent. However, if, due to loss of refrigerant, the compressor begins to operate in emergency mode or frequently turns on/off, this may cause additional sounds from the relay or the motor itself.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require regular defrosting to remove ice, as this happens automatically. However, it is recommended to completely turn off the device at least once a year, wash it and let it rest so that the lubricant in the compressor renews its consistency.
Does the voltage in the network affect the crackling sound of the refrigerator?
Unstable voltage can cause a humming sound from the compressor or frequent clicks of the protection relay. If there is a voltage surge in your network, it is recommended to use a stabilizer to protect the electronics and motor of the refrigerator.
What to do if a cracking sound appears after moving?
If the refrigerator was transported lying down, it should be allowed to stand upright for several hours (preferably a day) before turning it on, so that the oil flows into the compressor. If a cracking sound appears after this, check whether all the transport locks have been removed from the compressor.