Absolute silence in the kitchen is rare if you have household appliances running. Refrigeration unit is a complex mechanism in which physical processes constantly occur: gas compression, refrigerant movement, operation of electrical circuits. When refrigerator makes a sound, this is not always a signal of a breakdown; This is often normal operation of the system. However, the line between normal and malfunction can be thin, and the ability to distinguish between them will save your budget and nerves.
Owners are often scared when they hear an unfamiliar hum or a sharp click. There is no need to panic ahead of time. Acoustic background depends on many factors: the age of the equipment, the type of refrigerant, the installation location and even the quality of the voltage in the electrical network. It is important to learn how to classify sounds in order to understand whether you need to immediately call a specialist or just move the body.
In this article we will analyze all types of noise: from harmless gurgling to the alarming howl of a motor. You will learn how to carry out initial diagnostics on your own and in what cases the operation of equipment becomes dangerous. Understanding the physics of processes will help you not to overpay for the services of service centers where you can get by with simple adjustments.
Physics of the process: why a working refrigerator makes noise
The main source of sound waves is compressor. This is the “heart” of the system, which pumps the refrigerant, compressing it from a gaseous state to a liquid. At the moment of startup, the piston group experiences maximum load, which is inevitably accompanied by vibration and hum. Modern inverter models operate quieter, since they do not have sharp starting currents, but they cannot be called completely silent.
In addition to the motor, the refrigerant itself can make noise. Moving through the tubes of the condenser and evaporator, freon changes its state of aggregation. Boiling and condensation always accompanied by a characteristic gurgling or overflow. This is similar to the noise of water in heating pipes, only instead of water there is freon gas. The thinner the walls of the tubes and the higher the pressure, the louder this sound can be.
⚠️ Attention: If the hum of the compressor sharply intensifies and is accompanied by strong vibration of the housing, immediately check the stability of the unit. Long-term operation in this mode can lead to pipe breakage.
It is also worth considering the thermal expansion of materials. The plastic of the inner housing and metal elements contract or expand when temperature changes. This process often produces a cracking sound that sounds like clicking or even gunshots. Such sounds are most often heard when the motor stops or immediately after it is turned on, when temperature difference the temperature difference is greatest.
Normal sounds: when there is no need to worry
Many users turn to service, mistakenly believing that it refrigerator is broken, although it works properly. There are a number of sounds that are absolutely standard for most models, be it Atlant, Bosch or Liebherr. Understanding these nuances will help you avoid unnecessary expenses.
Firstly, this is the sound of a working compressor. Even quiet models produce a low-frequency hum. Secondly, these are the sounds of freon circulation. Thirdly, these are clicks from the thermostat or start relay. It is important to note that in modern systems No Frost the noise of a fan is added, which drives air through the chambers.
- 🔊 A uniform hum of the motor, which either dies down or intensifies depending on the operating cycle.
- 💧 Quiet gurgling or "murmur" of water, coming from inside the cabinet (freon movement).
- 🔨 Single clicks when turning the unit on or off (relay operation or thermal expansion).
- 🌬️ Fan noise in systems with forced air circulation (No Frost).
The first minutes can be especially loud after switching on. At this moment refrigerant the system is actively filling, and the compressor enters operating mode. If after 10-15 minutes the sound becomes smooth and predictable, then the equipment is working properly. It is also considered normal to periodically turn off and turn on the motor - this means that the set temperature is achieved and maintained.
Why is the new refrigerator noisier than the old one?
New models often seem noisier due to more powerful and efficient compressors, and also because you are accustomed to the quiet operation of older, worn-out equipment. In addition, new models use environmentally friendly refrigerants that can circulate under a different pressure, creating a more distinct overflow sound.
Alarming symptoms: what sounds indicate a breakdown
There is a category of sounds, ignoring which can lead to expensive repairs. If the refrigerator begins to make sounds that were not typical for it before, it is worth conducting a careful diagnosis. Often the problem lies not in the motor itself, but in the accompanying systems.
One of the most dangerous sounds is a high-pitched whistle or squeak. It may indicate a freon leak or a malfunction in the electrical part of the engine. Also, the sound of breaking glass or metal, which is repeated with a certain frequency, should cause alarm. This may indicate that the internal parts of the compressor are being destroyed.
- 🚨 Loud knocking or clanging, especially when starting (problems with the engine mount or compressor).
- 🔥 The sound of running water, if it is accompanied by the formation of puddles under the unit (drainage blockage).
- 📉 An intermittent hum that turns into clicks, after which the motor stops (failure of the start relay).
- 🌀 A whistling sound that intensifies when the door is opened (problems with the seal or fan).
⚠️ Attention: If you hear a burning smell combined with an unusual hum or crackling sound, immediately unplug the device. Continuing operation may lead to a fire in the wiring.
The situation when refrigerator it hums, but does not cool, deserves special attention. In this case, the motor runs empty, trying to build up pressure, but due to a leak or (clogged) capillary tube this does not happen. The sound in such cases is often more strained and higher in tone than usual.
Diagnostics by sound type: table of faults
For the convenience of classifying problems, a table has been compiled that will help you initially determine the source of the noise. Remember that an accurate diagnosis can only be made by a specialist using specialized equipment, but this table will give an understanding of the scale of the problem.
| Type of sound | Probable cause | Degree danger | Actions |
|---|---|---|---|
| Uniform humming | Normal operation of the compressor | Normal | Do nothing |
| Gurgling, overflow | Freon circulation | Normal | Do nothing |
| Loud knocking/clanging | Destruction motor mounts, touching the tubes | High | Call a technician |
| Intermittent clicks | Faulty start relay | Medium | Replacing the relay |
| Whistling/Squeaking | Freon leakage, wear of fan bearings | High | Tightness diagnostics |
When analyzing table data, pay attention to the context. If knock appears after transportation, most likely the fastenings have simply become loose. If the sound increases gradually over months, this is a sign of wear on the mechanical parts. In any case, ignoring extraneous noise reduces the service life of the unit unit.
External factors: vibration and incorrect installation
Often the cause of noise lies not inside the mechanism, but in operating conditions. Vibration is the main enemy of quiet operation. If the refrigerator is uneven, its legs are not adjusted, or it touches the wall, the hum of the compressor will intensify many times, being transmitted to building structures.
Check the distance to the walls. The instructions usually require leaving a gap of at least 5-10 cm for free air circulation. If the unit is pushed close, the heat is not removed, the motor overheats and starts to run louder. Also check whether condenser tubes (from behind) the wall or each other.
- 📏 Check the horizontal installation using a building level.
- 🔩 Make sure that all transport bolts and clamps removed.
- 🧱 Move the equipment away from the wall at least 10 cm.
- 🍽️ Check whether the internal shelves or dishes inside the walls of the chamber are touching.
Another common reason is the resonance of objects located nearby or inside. Vibration from the motor is transmitted to a nearby microwave, dishes on the table, or even to loose elements of the refrigerator itself. Try pressing the side wall or top cover with your hand while operating. If the sound has changed or disappeared, then the problem is casing resonance.
☑️ Checking the installation of the refrigerator
Internal faults: compressor, fan, relay
If external factors are excluded, you will have to look “under the hood”. The most common mechanical problem is wear of the shock absorbers on which the compressor is suspended. Over time, the rubber dries out, and the engine begins to hit the metal casing or frame every time it is started. This causes a characteristic metallic clang. compressor. Over time, the rubber dries out, and the engine begins to hit the metal casing or frame every time it is started. This causes a characteristic metallic clanging sound.
In models with the system No Frost the fan often fails. The fan blades may become contaminated with dust, causing imbalance and humming, or the fan motor bearing may wear out, causing whistling and grinding noises. In some cases, the blades may touch ice if the defrost system is not working correctly.
The start relay is another candidate for replacement. This is a small part that provides an impulse to start the engine. When it wears out, the contacts begin to spark and click in an attempt to start the compressor. If you hear a series of quick clicks, after which the motor hums for a couple of seconds and then goes silent, this is a classic symptom of a faulty start relay.
⚠️ Attention: Replacing the compressor yourself or repairing the HDA requires special tools and skills. Do not try to disassemble sealed systems without preparation - this is dangerous and will void the warranty.
Do-it-yourself methods for eliminating noise
What can you do yourself without the skills of a professional repairman? First of all, eliminate vibration. If the legs are not adjustable or there are not enough of them, you can place special anti-vibration pads or pieces of thick rubber under them. This often reduces the overall noise level by 10-15%.
If the tubes from behind are humming, carefully (with the device turned off!) try to straighten them a little so that they do not touch each other and the body. This must be done very carefully, since copper is a soft metal and can be easily damaged. To reduce noise from the compressor, some craftsmen make a sound-insulating box, but this can interfere with the cooling of the motor, so this method is not recommended without calculations.
In the case of a No Frost fan, sometimes cleaning it from dust and lubricating the bearing (if the design allows it) helps. However, if the bearing is already “humming”, it is better to replace it with a new one. The cost of the part is low, and the effect of replacement is significant. Also check if ice is frozen on the blades - this is a sign of problems with defrosting.
Prevention: how to prolong the quiet operation of the equipment
So that refrigerator is happy silence for as long as possible, it is important to follow the operating rules. Do not overload the chamber with food beyond normal limits - this creates additional stress on the cooling system. Keep the condenser clean at the back: a layer of dust acts like a “fur coat”, interfering with heat transfer, which makes the compressor work longer and more intensely.
Regularly defrost the equipment (if it is not No Frost) so that the layer of ice does not interfere with the operation of the evaporator. Check the integrity of the rubber seals on the doors. If it does not fit tightly, warm air gets inside, the motor is forced to turn on more often, which increases wear and the likelihood of noise.
Timely maintenance is the key to longevity. Once a year, it is recommended to inspect the fastenings and clean the internal mechanisms from dust. If you notice that the nature of the sound has changed, do not wait for a complete breakdown. Early diagnosis allows you to fix the problem with small means, replacing a cheap part before it damages more expensive components.
Frequently asked questions (FAQ)
Why does the refrigerator hum loudly only at night?
At night, the overall noise level in the apartment decreases, and the operation of the equipment becomes more noticeable. In addition, at night the voltage in the electrical network can be more stable, which allows the motor to operate at full power without sags. Also at night, the heating system is quieter, and vibration through the pipes can resonate with the refrigerator.
Is it dangerous if the refrigerator makes the sound of breaking glass?
Most often this is the sound of thermal expansion of plastic or bursting of freon bubbles in the pipes, which is not dangerous. However, if the sound is very loud and repeated frequently, it may indicate damage to the valves inside the compressor. In this case, it is better to call a technician for diagnostics.
Is it possible to lubricate the compressor if it starts to creak?
No, the compressor is a sealed unit. There is no point in lubricating the external parts, and you cannot open it. The squeaking noise is usually caused by internal parts rubbing against the body due to worn shock absorbers. It is necessary to either change the rubber gaskets, or, as a last resort, the compressor itself.
Does the flatness of the floor affect the noise level?
Yes, it does critically. If the refrigerator stands crosswise (diagonal rocking), vibration from the motor is transmitted to the floor and walls much more strongly. Adjusting the legs to perfect stability is the first step to reducing noise.
Why is an old refrigerator quieter than a new one?
Old models often used less powerful motors and thicker metal housings, which dampened the sound. Modern units are more powerful and efficient, but their motors operate at higher speeds, and the thin plastic of the housing can resonate. In addition, the old models have simply gotten used to it and are covered with a layer of dust that muffles the sound.