The situation when your the refrigerator makes strange soundscan unsettle any owner of household appliances. Just yesterday the unit worked quietly and imperceptibly, but today it hums, clicks or makes a frightening hissing sound. The first reaction is often panic and the thought of expensive repairs or complete replacement of equipment. However, you should not make hasty conclusions, because not every sound indicates a critical breakdown.
Modern models, such as LG DoorCooling+ or Bosch VitaFresh, are equipped with complex refrigerant circulation and control systems that can create specific acoustic background. Understanding the nature of these noises will help you distinguish the normal operation of the mechanisms from a real malfunction that requires the intervention of a technician. In this article we will analyze in detail the main causes of extraneous sounds and methods for eliminating them.
First of all, you need to calm down and listen carefully. The nature of the sound, its frequency and conditions of occurrence are key diagnostic features. If you can accurately describe the problem, finding a solution will take much less time. Let's look at the main scenarios that users encounter.
Gurgling, overflowing and sounds of flowing water
The most common question that users have: why the refrigerator makes strange soundsresembling a liquid transfusion? In the vast majority of cases, this is an absolutely normal physical phenomenon. The refrigerant circulating through the tube system changes its state of aggregation from liquid to gaseous and back. This process is inevitably accompanied by a characteristic gurgle.
Such sounds are especially often heard in models with a system No Frostwhere freon moves along more complex trajectories. After the compressor is turned off or, conversely, at the time of startup, the pressure in the system changes sharply, which enhances the acoustic effect. If your the refrigerator makes strange sounds exactly this type, but the food cools normally, there is nothing to worry about.
However, you should pay attention to the intensity of the noise. If the gurgling becomes a loud bubbling noise that can be heard even in the next room, this may indicate an incorrect installation. The unit must stand strictly horizontally so that the oil and freon circulate correctly.
- 🌊 The sound of flowing water is most often heard immediately after defrosting or loading warm products.
- ⏱️ The duration of the sounds usually does not exceed 5-10 minutes after starting the compressor.
- 🔇 In modern In inverter models, the noise may be barely noticeable, while older units are noisier.
It is important to note that in some cases the sound of flowing water may indicate a clogged capillary tube, but then the lack of cold in the chambers will certainly add to the acoustic discomfort. If the temperature is normal, then your ears have simply become more sensitive to the operation of the equipment.
Loud hum, vibration and rattling of the case
If the refrigerator makes strange sounds in the form of a low-frequency hum or vibration, the problem most often lies in the mechanics or installation. The compressor is the “heart” of the unit, and its operation is always accompanied by vibration. If installed incorrectly, this vibration is transmitted to the body, floor, or nearby objects, creating a resonating hum.
The first thing to do is check the adjustment supports. They must be unscrewed so that the refrigerator stands stable and does not wobble with a slight push. It often happens that the unit stands on an uneven floor, and one of the legs simply hangs in the air, which causes distortion and increased noise. Also check the distance to the walls: the gap should be at least 5-7 cm for free air circulation.
⚠️ Attention: If the hum is accompanied by strong heating of the side walls and the compressor runs non-stop, the condenser (grid at the back) may be dirty or the blower fan is faulty.
Internal contents can also cause rattling. Check whether the bottles are tightly placed on the shelves and whether empty glass containers are vibrating. Sometimes the source of the sound is an object forgotten at the top of the refrigerator or a decorative sticker that has come off and is loose.
In more serious cases, the humming indicates wear on the compressor parts or problems with the start relay. If the sound becomes metallic, this is a signal that the refrigerator is making strange sounds due to friction of the internal parts of the motor against the housing or against each other.
☑️ Vibration diagnostics
Clicks, crackles and sounds of electrical discharges
Single clicks, heard at intervals of several minutes or hours, often frighten owners, but in 90% of cases they harmless. These sounds are made by the thermostat or start relay when they open or close an electrical circuit to maintain a set temperature. This is especially typical for mechanically controlled equipment.
However, if The refrigerator makes strange sounds in the form of frequent crackling sounds similar to electrical discharges, or a series of quick clicks, followed by silence and lack of cold, the situation is more serious. This may indicate a faulty compressor start relay. The relay tries to start the motor, but cannot, opening the circuit with a characteristic click.
Crackling can also be caused by thermal expansion of plastic parts inside the chamber. When there is a sudden change in temperature (for example, after defrosting), the plastic contracts or expands, producing sounds similar to gunshots or crackling frost. This phenomenon is temporary and goes away after the temperature has stabilized.
| Sound type | Probable cause | Urgency of repair |
|---|---|---|
| Rare clicks | Thermostat operation | Not required |
| Frequent clicks without cold | Relay/compressor malfunction | High |
| Plastic crackling | Thermal expansion | Not required |
| Electrical humming | Wiring or motor problems | Critical |
If you hear clicking noises and see the lights in the camera flickering or going off at the time of the sound, this is a clear sign of electrical problems. In this case, it is better to disconnect the device from the network and call a specialist for diagnostics.
Whistling, hissing and air currents
In models with the system No Frost fans are responsible for circulating cold air. If the refrigerator makes strange soundsresembles a whistle or a strong flow of air, most likely this is the case. In good condition, the fan should be quiet, but over time, the bearings can wear out and the blades can become dirty.
Hissing often occurs when there is a refrigerant leak. If gas escapes under pressure through a microcrack in the system, it makes a characteristic whistling sound. This is one of the most unpleasant situations, as it requires searching for leaks, evacuating the system and refilling with freon.
Another reason for the whistle is freezing of the evaporator. Ice can block the fan blades, causing the motor to hum or whistle when attempting to rotate. In this case, it is often necessary to completely defrost the unit during the day.
How to check the fan?
Unplug the refrigerator. Remove the back panel in the freezer (usually it's plastic). Manually turn the fan blades - they should rotate easily and silently. If you hear a crunching sound or there is play, the fan requires replacement.
Do not ignore the hissing, especially if it is accompanied by the appearance of ice in unusual places or poor cooling. Freon leakage not only disables the equipment, but can also be dangerous in a confined space with high concentrations.
Knock and grinding: mechanical damage
When the refrigerator makes strange sounds, similar to the knocking of metal on metal or a rough grinding sound, is almost always a sign of mechanical failure. The piston could be stuck in the compressor, or the engine bearings could be damaged. Operating the device in this mode is unacceptable - the motor can completely burn out in a matter of hours.
The compressor itself can also make a knock if it has become loose on the mounting shock absorbers. During operation, the motor begins to “hit” the body or frame of the refrigerator. Check the rubber gaskets under the compressor - they could have dried out or fallen off.
A grinding noise in the freezer area often indicates that ice has reached the fan blades. The ice breaks off and gets into the mechanism, causing friction. In this case, defrosting is necessary, but if the grinding noise continues after it, it means that the fan bearing is already damaged.
⚠️ Attention: Do not try to disassemble the compressor yourself or hit it with a hammer. This is a sealed unit, and any violation of the integrity of the housing will lead to an immediate loss of freon and the need for an expensive replacement of the unit.
If you hear a rhythmic knocking sound that increases over time, immediately turn off the device. Further work may lead to a fire hazard or complete failure of the control electronics.
Specifics of operation of inverter compressors
Owners of modern equipment are often surprised to discover that their new one the refrigerator makes strange soundsthat was not present in older models. Inverter compressors installed in brands Samsung Digital Inverter or LG Linear Coolingoperate on a different principle. They do not turn off completely, but only change speed.
Because of this, a low-frequency hum may occur, which either increases or decreases. This is normal operation mode, allowing you to save energy and maintain an accurate temperature. The sound may be higher in frequency than that of conventional compressors, which is sometimes perceived as a “squeak” or “howl.”
It is also worth considering that the new models use a more environmentally friendly, but also noisier, refrigerant R600a (isobutane). It circulates under a different pressure, which can produce more pronounced gurgling and pouring sounds compared to the old R134a freon.
If you have just bought equipment, give it a couple of days to “break in”. The mechanisms should get used to it, and the noise level may decrease. However, if the sound interferes with sleep or causes discomfort, contact a service center to check the vibration level.
When you need to call a technician
To summarize: if The refrigerator makes strange sounds, but the cooling is normal, and the sound itself looks like gurgling or rare clicks, most likely the equipment is working. But there are a number of “red flags” that cannot be ignored.
A call to a specialist is required if the noise is accompanied by loss of cold, the appearance of puddles under the refrigerator, a burning or plastic smell, and also if the compressor runs continuously without turning off. In these cases, delay can lead to spoilage of food and increased cost of repairs.
Is it normal for the refrigerator to crack after defrosting?
Yes, this is normal. The plastic elements of the chamber and the metal evaporator expand when heated, making a cracking noise. This usually goes away after 1-2 hours of operation.
Why did the old refrigerator start to hum more?
Over time, the compressor shock absorbers wear out, the oil in the motor dries out, and dust may also accumulate on the condenser, which impairs heat transfer and makes the compressor work harder.
Can sound be related to power quality?
Yes, power surges or low voltage in the network can cause humming noise from transformers and unstable operation of the compressor. It is recommended to use a voltage stabilizer.
Is the sound of ice breaking in the freezer dangerous?
The sound of ice breaking (crackling) is not dangerous, but indicates that the defrost system is working. If there is too much ice and it prevents the door from closing, this is a sign of a malfunction.
How often should you check the ventilation behind the refrigerator?
It is recommended to check the gap and clean the condenser grille from dust and animal hair at least once every 6 months to prevent overheating and noise.