A sudden hum, an obsessive buzz or sharp clicks can unsettle any owner of household appliances. When the refrigerator makes strange sounds, this often becomes the first signal that a malfunction has occurred in the operation of the unit, although in some cases such noises may be absolutely normal. It is important not to panic, but to listen carefully to the nature of the vibration and understand its source.
Modern models, be they quiet Liebherr or budget ones, work on similar physical principles, but have different sound insulation. Understanding exactly what a good compressor should sound like will help you quickly weed out false alarms and focus on the real problems. In this article we will analyze in detail acoustic anomalies and methods for eliminating them. Indesit, work on similar physical principles, but have different sound insulation. Understanding exactly what a good compressor should sound like will help you quickly weed out false alarms and focus on the real problems. In this article we will analyze in detail acoustic anomalies and methods for eliminating them.
Normal operating noise and its characteristics
Many users begin to sound the alarm when they hear the first buzz after purchasing a new device. However operating noise is an inevitable companion of any compression equipment. The engine pumping refrigerant through a system of tubes always produces a background hum, which can intensify during startup or the active cooling phase.
In addition, in modern models with the system No Frost the sound of a running fan is often heard. It circulates cold air inside the chambers. If the sound is smooth, monotonous and does not cause discomfort at a distance of one meter, then most likely your unit functions normally. Rare clicks of the thermostat are also considered normal.
⚠️ Attention: If you have just installed the refrigerator, let it sit for at least 2-4 hours before turning it on. The transportation oil must drain into the compressor crankcase, otherwise the noise during startup will be significantly higher than normal, and the risk of breakdown will increase.
The intensity of the sound also depends on the position of the equipment. If the floor is uneven or the legs are not adjusted, resonance occurs, increasing the vibration of the frame. In this case, it is enough to simply tighten the supporting elements to reduce the decibel level.
Diagnostics by type of sound emitted
To understand why The refrigerator makes strange soundsit is necessary to classify the source of the noise. Different faults have a unique acoustic signature. For example, gurgling is most often associated with the movement of freon, while a metallic clanging indicates mechanical problems.
Below is a table that will help you initially identify the problem by sound. Pay attention to repetition rate and volume.
| Sound type | Probable cause | Danger level | Required actions |
|---|---|---|---|
| Loud humming | Compressor malfunction or bearing wear | High | Checking the motor mounting |
| Gurgling/Overflow | Refrigerant circulation in the pipes | Low (Normal) | Observation |
| Sharp clicks | Relay or thermostat operation | Medium | Starter diagnostics relay |
| Whistling/Squealing | Problems with the fan or belt | Medium | Lubricating or replacing the fan |
| Rattling | Touching the tubes on the body or furniture | Low | Move the equipment away or straighten the tubes |
It is important to note that compressor the old model can be much louder than modern inverter models. If your device is more than 10 years old, increased noise may be a sign of natural wear and tear on rubbing parts. In this case, it is worth thinking about prevention.
External factors that increase vibration
Before disassembling the equipment or calling a technician, it is worth eliminating trivial causes. Often the refrigerator makes strange sounds due to improper installation or interaction with surrounding objects. Vibration from a running motor is transmitted to the floor and walls, creating resonance.
The first thing you need to check is the gap between the back wall of the unit and the wall of the room. If the distance is too small, the vibration is transmitted to the building structures, and the hum increases many times over. Also check that the condenser tubes do not touch each other or the metal elements of the case.
Another common factor is foreign objects on the top panel or inside the chambers. Heavy cans installed close to the walls can rattle from the slightest vibration. Remove all excess and check whether the extraneous sound has disappeared.
- 🔍 Check the stability of the legs: rock the body, it should not wobble.
- 🔍 Move the equipment away from the wall at least 5-7 cm for free air circulation.
- 🔍 Make sure that there are food does not touch the back wall.
- 🔍 Check if something has fallen behind the refrigerator (for example, a spoon or coin).
Problems with the compressor and start relay
If external factors are excluded, and The refrigerator makes strange noisesthe problem may lies in the “heart” of the unit - the compressor. A loud, strained hum that turns into a metallic clang often indicates that the motor is overloaded. This may be caused by a faulty start relay.
The start relay is responsible for starting the engine. If it is burnt or stuck, the compressor may try to start, make a sharp clicking noise and immediately stall. The cycle may repeat every few minutes. In such a situation, operating the equipment is dangerous - the motor may burn out completely.
⚠️ Attention: If you hear a loud click, after which the refrigerator turns off and no longer starts on its own, immediately unplug it. Further attempts to turn on may result in a short circuit or fire in the wiring.
In some cases, the compressor itself requires replacement. This is an expensive repair that requires evacuation of the system and refilling with freon. It is strictly prohibited to carry out such work on your own without special equipment Is it possible to replace the compressor yourself?.
Is it possible to replace the compressor yourself?
Theoretically this is possible, but in practice it requires expensive equipment: a vacuum pump, a pressure gauge station, a burner and sealed refrigerant. Without experience, there is a high risk of depressurization of the circuit, which will lead to complete failure of the equipment. Savings on technicians in this case are questionable.
Malfunctions of the No Frost system and fans
In models with the system No Frost fans are responsible for air circulation. Over time, their bearings wear out, resulting in whistling, whining, or crackling noises. If the refrigerator makes strange soundsresembles the operation of an airplane propeller, most likely the problem is here.
Often the fan starts making noise due to frozen ice. In the defrost mode, the heating element could burn out, the ice did not melt, and when the fan was turned on, the blades began to touch the ice crust. This causes a characteristic cracking sound and can lead to damage to the impeller.
For diagnostics, you need to remove the back panel in the freezer (after defrosting the unit). A visual inspection will show the presence of ice and the condition of the blades. Lubrication of bearings usually gives only a temporary effect; it is better to immediately replace the unit.
☑️ Fan diagnostics
When you need to call a specialist
There are a number of symptoms in which self-repair is not only useless, but also risky. If The refrigerator makes strange sounds in combination with other alarming signs, it is better to trust the professionals. Delay can lead to damage to food and higher repair costs.
Situations associated with a refrigerant leak are especially dangerous. Although freon itself often has no odor (or has a specific smell if it is a mixture with oil), an indirect sign may be the lack of cold when the compressor is running. If the motor hums continuously without turning off, and the temperature in the chambers does not drop, this is a sign of a serious circuit malfunction.
- 🛑 There is a smell of burning or melted plastic.
- 🛑 An oily puddle has formed on the floor under the refrigerator.
- 🛑 Unit body gets very hot in certain places.
- 🛑 The compressor runs non-stop for more than 12 hours.
Remember that the complex electronics of modern models require special knowledge for diagnostics. An attempt to “pick” the control board can lead to failure of expensive modules.
Noise prevention and equipment care
In order for your refrigerator to serve for a long time and quietly, you need to take proper care of it. Regular defrosting (even for the No Frost system, at least once a year for prevention) helps to avoid the formation of ice plugs that cause fan noise.
Keep the condenser clean - the black grille at the back. Dust and pet hair clogged between the coils impair heat transfer. The compressor has to work harder, which increases noise levels and energy consumption. Cleaning with a vacuum cleaner or a soft brush works wonders.
Also, do not overload the chambers with food. Packing that is too dense interferes with air circulation, forcing the system to work at its limit. Following simple operating rules will extend the life of your equipment.
Why does the refrigerator click when turned off?
A click when turned off is the sound of the contacts of the thermostat or start relay opening. This is an absolutely normal physical process. When the temperature in the chamber reaches the set value, the circuit opens and the compressor stops. If the clicks become too frequent or are accompanied by a hum, it is worth checking the thermostat.
Can an old refrigerator begin to make more noise?
Yes, over time, the lubricant in the compressor thickens or burns out, and the rubber shock absorbers dry out. This leads to increased vibration and the appearance of new sounds. Sometimes replacing the rubber washers under the motor helps, but often this is a sign of natural aging of the equipment.
Is it dangerous if the refrigerator gurgles after it is turned off?
No, it is not dangerous. After the compressor stops, the refrigerant in the tubes continues to flow from the high pressure zone to the low pressure zone. This process can last several minutes and is accompanied by characteristic gurgling and overflow of liquid.
How to understand that it is the compressor that is making noise?
Put your hand on the side wall or back of the refrigerator (where the motor is located). If you feel a strong vibration with a humming sound, the source is the compressor. If there is no vibration, but there is sound, most likely the fans are making noise or flowing freon.