Strange sounds emanating from household appliances always cause concern to the owner. Especially if it is a sharp, loud bang that can be heard even in the middle of the night. Many users immediately begin to panic, assuming that their refrigerator compartment has failed or is about to explode. However, this sound does not always indicate a critical breakdown.
Often the reason lies in completely natural physical processes occurring inside the unit. To understand whether you need to call a technician or whether you can sleep peacefully, you should analyze the nature of the sound, its frequency and the accompanying symptoms of the device. In this article, we will take a detailed look at why it is heard pop in the refrigeratorand will help determine whether this is normal or a sign of a malfunction.
It is important not to ignore recurring anomalies, but also not to make hasty conclusions. Correct diagnosis begins with understanding how your unit works. Modern models, whether Indesit, Atlant or premium LGhave their own operating characteristics, which can manifest themselves in the form of a specific acoustic background.
Natural physical processes: expansion and contraction
The most common and absolutely safe reason for the appearance of pops is the thermal deformation of materials. Cooling and heating processes constantly occur inside the refrigerator (during idle time or defrosting). The plastic from which the internal walls, shelves and drawers are made tends to expand when heated and contract when cooled.
When the temperature difference between the parts is large, the material does not have time to deform smoothly. As a result of the accumulated voltage, a sharp jump occurs, which we hear as a loud crack or pop. This is especially true for new models or after defrosting. In such cases thermostat simply runs its cycle, starting or stopping the compressor, which causes a temperature difference.
⚠️ Attention: If the cotton is accompanied by a burning smell, smoke or sparks, immediately disconnect the device from the power supply. This is a sign of a short circuit or overheating of the wiring, which requires urgent intervention from an electrician.
Often such sounds can be heard at night, when there is silence in the apartment, and the refrigerator goes into cooling mode after opening the door during the day. This is also facilitated by the low quality of plastic in budget models, which is more sensitive to temperature changes. If you notice that the sound is heard exactly when the motor starts or stops, most likely there is nothing to worry about.
Problems with the defrosting system and ice
The second most common reason is the formation and chipping of ice. In systems No Frost and even in drip models, an ice crust may form on the evaporator. If the automatic defrosting system does not work correctly or the drainage hole is clogged, ice accumulates in large volumes.
When the heating element (heating element) is turned on for defrosting, a massive piece of ice can suddenly break off from the evaporator and fall with a roar to the bottom of the chamber or onto metal parts. This impact is often perceived as a strong bang or even an explosion. In such cases, it is important to check the condition drainage system and integrity of the defrost heater.
☑️ Diagnostics of the defrost system
In addition, ice can block the fan blades in the systems No Frost. When the engine tries to start, the fan may hit the ice plug, make a cracking sound, and then, when the ice breaks or the engine turns over, a characteristic click is heard. This is already a signal that the refrigerator is required to be done manually for 10-12 hours. launch, which is immediately interrupted, the problem may be more serious. Often the culprit is the compressor start relay. This device is responsible for starting the engine, and if it is faulty, the contacts inside can stick or burn, producing a loud click when the circuit is opened. defrosting refrigerator manually for 10-12 hours.
Start relay and compressor malfunctions
If the popping noise is heard at the bottom of the refrigerator, where the motor is located, and is accompanied by an attempt to start, which immediately ends, the problem may be more serious. Often the culprit is the compressor start relay. This device is responsible for starting the engine, and if it is faulty, the contacts inside can stick or burn, making a loud clicking sound when the circuit opens.
In more severe cases, it itself compressor can make sounds reminiscent of a shot if a hydraulic shock occurs inside it (liquid freon enters instead of gaseous) or if the internal suspension of the motor is destroyed. This sound is usually very loud and frightening.
| Sound type | Probable cause | Danger | Action |
|---|---|---|---|
| Deaf cracking inside the chamber | Thermal expansion of plastic | No | Observation |
| Sharp click at the bottom (start) | Start relay | Medium (risk of motor burnout) | Replacement of relay |
| Loud bang + humming | Compressor jammed | High | Call masters |
| Slap with periodicity | Ice chipping | Low | Defrost/Cleaning |
It is worth noting that if after the pop the refrigerator stops cooling or the motor It hums, but does not start, it can no longer be used. This can lead to complete failure of the refrigeration unit and costly repairs.
The influence of improper operation
Often users themselves provoke the appearance of strange sounds without knowing it. For example, loading hot food into the chamber causes a sharp increase in the temperature inside. Sensors detect this and give a command to intensively operate the compressor, which leads to rapid cooling of the walls and their deformation with sound effects.
Another reason is the unstable position of the refrigerator. If the feet are not adjusted correctly, the cabinet may warp. During operation, vibration from the motor is transmitted to the body, and at some point parts may shift or internal elements may slip, causing a shock. Check that your refrigerator is level using a building level.
Also pay attention to how tightly the door is closed. If the seal is dirty or damaged, the door may not seal completely. At some point, under the influence of a magnet or spring mechanism, it may slam shut, creating a vacuum pop. Regularly wipe sealing rubber and check its integrity.
Diagnostics: when is it time to call a specialist
How to distinguish normal from breakdown? If the clap was a one-time noise and the refrigerator continues to operate normally, is cold and does not make other strange sounds, most likely it was a physiological process. However, there are “red flags” that cannot be ignored.
Contact the service center immediately if:
- 🔥 The cotton was accompanied by a flash of light or sparks in the compressor area.
- 📉 The temperature in the chambers stopped decreasing, the products began to deteriorate.
- 🔊 The sound is repeated cyclically every few minutes, and the engine does not start.
- 💨 A specific chemical smell has appeared, different from the smell of ordinary plastic.
⚠️ Attention: Self-disassembly of the compressor or freon circulation system is prohibited and is life-threatening. Freon is under high pressure, and the oil in the system can be toxic.
Professional diagnostics will allow you to accurately determine whether it is intact motor winding, whether there has been a breakdown in the housing and whether the electronic control board is functioning. In modern models with inverter compressors, diagnostics are even more complicated and require special equipment.
Prevention and care of equipment
To minimize the risk of problems associated with sounds and vibrations, it is necessary to regularly service the equipment. Once every six months, it is recommended to carry out a complete defrost (even for systems No Frost), disconnecting the device from the network for a day. This will help relieve stress on the materials and defrost hidden areas of ice.
It is also important to keep the condenser (grids at the back or bottom) clean. If it is clogged with dust and animal hair, heat transfer deteriorates. The compressor begins to work with overload and heats up, which increases the likelihood of parts deforming and knocking noises. For cleaning, use a soft brush or vacuum cleaner.
The secret of quiet operation
Install the refrigerator away from heat sources (stove, radiator) and direct sunlight. This will reduce the thermal load on the body and reduce the frequency of expansion-compression cycles of the plastic.
Check the level of the refrigerator regularly. If the floor is uneven, use the adjustment screws on the front feet. The correct tilt back (approximately 2 degrees) ensures that the doors close themselves, but do not slam forcefully. This will extend the life of the hinges and seal.
Why does a new refrigerator slam more than an old one?
New models are often made using more rigid and environmentally friendly types of plastic that have a high coefficient of thermal expansion. Until the materials “break in” and adapt to operating temperatures (usually 1-2 months), sounds may be louder. Over time, the plastic becomes more elastic, and the popping sounds become quieter or disappear.
Can popping be a sign of an explosion?
In household refrigerators, explosive processes in the classical sense do not occur. Freon does not burn or explode at atmospheric pressure. A loud sound is always either mechanical destruction of ice/plastic, or electrical breakdown (sparking), or hydraulic shock in the compressor. There is no need to panic, but you need to check the equipment.
What to do if a bang is heard at night?
Do not rush to immediately unplug the cord from the outlet in the dark. Listen: does the motor run after the sound? Is the light on inside? If the refrigerator is humming and getting cold, go to bed peacefully, it was most likely plastic. If there is silence or there is a burning smell, turn off the power and leave it until the morning.
Does the voltage in the network affect the appearance of pops?
Yes, indirectly. When the network voltage is low, the starting relay may not work correctly, taking a long time to try to start the compressor. This leads to frequent clicks and eventual pops when the contacts open. If there is a voltage surge in your network, it is recommended to use a stabilizer to protect expensive equipment.