The silence in the apartment at night is often disturbed by strange sounds coming from the kitchen. Many owners notice that it is in the dark that a household appliance begins to make characteristic clicks, crackles, or even loud bangs. A natural concern arises: is the unit broken, or is this normal for its operation? In most cases, it is too early to panic, since some sounds are a consequence of physical processes occurring inside the system.
However, you should not completely ignore the situation. If The refrigerator clicks with alarming regularity or makes sounds that were not there before, this may signal an incipient failure. At night, when the background noise of the street subsides, any extraneous noise becomes clearly audible. Understanding the nature of these sounds will help you save money on repairs or, conversely, contact a specialist in time.
Natural physical processes and thermal expansion
The most common reason why a device makes a cracking sound is associated with elementary physics. The inner walls of the chamber and the evaporator are made of plastic or metal, which tend to shrink or expand when the temperature changes sharply. At night, the compressor may work intensively to maintain set parameters, which causes temperature changes on surfaces.
These sounds often resemble the crackling of a fire or the snapping of fingers. They are absolutely normal for new models and for devices that have just been defrosted. Thermal expansion materials unevenly occur, especially in the areas where different parts are joined. As soon as the temperature stabilizes, the sounds usually stop.
If you notice that Atlant refrigerator or any other brand makes such sounds only when the motor is turned on or off, then this is a normal situation. The housing design responds to changes in internal pressure and temperature. In such cases, human intervention is not required, and the device will serve properly for many years.
⚠️ Attention: If the cracking is accompanied by the appearance of ice on the food or an uncharacteristic hum that does not stop for hours, it is worth checking the operation of the thermostat.
Work compressor and start relay
The heart of any refrigeration unit is the compressor. It is this that ensures the circulation of refrigerant throughout the system. The loud clicking noise you hear most often means it is start relay trying to start the engine. If the launch was successful, a characteristic hum is heard. If the motor does not start on the first try, the relay clicks again, trying to repeat the cycle.
At night these sounds seem louder due to the lack of daytime noise. It is important to distinguish between a single click at startup and a series of frequent clicks. In the second case, the situation may indicate problems with the electrical part or the compressor itself. Parts compressor wear out over time, which can lead to louder operation.
Modern inverter models are quieter, but they are not without sounds when mechanical parts operate. If clicks occur once every 15-20 minutes and are accompanied by the engine starting, this is a normal operating cycle. However, if the motor hums, clicks, and immediately turns off without starting to cool, this is a sign of a problem.
What is a start relay?
The start relay is a small electrical component that provides the impulse to start the compressor motor. If it fails, the motor cannot start, and you hear repeated clicks.
Problems with the No Frost and defrosting system
Owners of equipment with the system No Frost often encounter a crashing sound that differs from the sounds of a conventional drip system. These models have an automatic defrost system that periodically turns on the heating element to defrost the evaporator. The sudden heating of the heating element causes expansion of the plastic elements of the air ducts, which creates a cracking sound.
In addition, ice plugs can form in the air circulation system. When the fan tries to move air, ice can interfere with the blades, causing intermittent clicking or knocking noises. This often happens if the drainage hole is clogged and the water does not have time to drain, freezing in unnecessary places.
Checking the defrost system requires care. If you hear the Bosch refrigerator or LG cracking during the defrosting cycle (usually this happens several times a day), most likely the problem is in the drainage or heating element. Ignoring this can lead to the formation of a “fur coat” inside the case and damage to the fan.
☑️ Diagnostics of the No Frost system
The influence of improper installation and vibrations
Often the cause of night concerts is a trivial incorrect installation of the device. If the refrigerator stands unevenly, vibrations from the operating compressor are transmitted to the housing and intensified. At night, when the motor is running in silence, these vibrations can cause shelves, bottles, or the legs themselves to rattle on the floor.
The distance to the walls is also important. If equipment is placed close to furniture or a wall, vibration can be transmitted to building structures, creating a resonating sound. It is enough to move the unit a few centimeters for the sound to disappear. An uneven floor is another common culprit that causes the case to warp and creak.
To fix the problem, you need to level the position of the case. Adjusting the height of the front legs allows you to compensate for uneven floors. Make sure that nothing is loose inside the chambers, and that drawers and shelves are firmly in place.
⚠️ Attention: When leveling the refrigerator, do not place wooden blocks or cardboard under the legs, as they will wrinkle over time and the vibration will increase. Use only standard adjustable supports.
Comparison of sounds: normal or broken
To understand whether it is worth calling a specialist, you need to learn how to classify sounds. Different types of noise indicate different technical conditions. Below is a table that helps differentiate normal sounds from signs of malfunction.
| Sound type | Probable cause | Status |
|---|---|---|
| Rare crackling sound (like cooling metal) | Thermal expansion of materials | Normal |
| Single click before starting | Trigger relay | Normal |
| Series frequent clicks without starting | Faulty relay or compressor | Repair required |
| Gurgling and overflowing | Circulation of refrigerant (freon) | Normal |
| Loud knocking of the fan | Foreign object or ice in the No Frost system | Cleaning/repair required |
Analyzing the table, we can conclude that the majority of quiet and periodic sounds do not pose a threat. However, if the nature of the sound changes to a sharper, metallic or frequent one, this is a reason for diagnosis. Compressor should not operate jerkily.
When specialist intervention is necessary
There are situations where independent actions can only cause harm. If you hear electrical cracklingwhat sounds like sparking, immediately unplug the device. This may indicate a breakdown in the wiring or a malfunction in the electrical circuit, which creates a risk of fire.
Also, the help of a specialist is needed if the clicks are accompanied by a lack of cold. If the engine hums, clicks, but does not start, or starts for a couple of seconds and stalls, the problem is serious. This could be an inter-turn short circuit of the compressor windings or a failure of the start-up relay.
In the case of modern models equipped with electronic control, strange sounds may indicate a malfunction in the control module. It is dangerous to climb inside the technical compartment on your own without knowledge and tools. It is better to entrust the diagnosis to professionals who will accurately determine the source of the noise.
⚠️ Attention: The characteristics and designs of refrigerators from different brands (Indesit, Samsung, Liebherr) may differ. The details of the device and the location of components vary from model to model, so always check the official instructions before disassembling.
Prevention of noisy operation
In order for your refrigerator to work quietly and for a long time, it is important to follow the operating rules. Regular defrosting (for drip systems) will prevent excess ice from forming, which can cause cracking. Keep the condenser grill at the back clean, as overheating of the compressor due to dust also affects the nature of its operation.
Watch how you load the chambers. Overloaded shelves can put pressure on the walls, causing warping and squeaking. Products should not touch the back wall where the evaporator is located, so as not to create unnecessary noise during cooling. Correct loading ensures uniform air circulation.
To summarize, we can say that night clicks are most often a consequence of natural physical processes. However, paying close attention to the nature of the sounds will help you not to miss the onset of a serious breakdown. If you doubt the nature of the noise, it is better to play it safe and consult with a specialist.
Why does the refrigerator click immediately after turning off the lights?
This is due to the operation of the thermostat. When the temperature inside the chamber reaches the set value, the relay opens the compressor power circuit, which is accompanied by a click. This is an absolutely normal process of completing the cooling cycle.
Is it dangerous if the refrigerator is cracking, as if something is burning?
Yes, it is dangerous. A sound that sounds like sparkling or burning may indicate a short circuit in the wiring or a faulty start relay. You must immediately unplug the cord from the outlet and call a technician.
Can an old refrigerator start clicking more?
Yes, over time the compressor bearings and mountings wear out, which can increase vibration and noise. Also, plastic ages, which becomes more fragile and reacts loudly to temperature changes.
Does the level of voltage in the network affect clicks?
Yes, with low voltage in the network, the compressor may not have enough power to start. The starting relay will try to start the motor repeatedly, making frequent clicks, until the protection is triggered or the voltage stabilizes.