Buying modern household appliances is always an expectation of comfort and silence, therefore, when, after installation new refrigerator starts to make strange sounds, this causes natural anxiety in the owner. Many people immediately start looking for the service center number, fearing a defect, but there is no need to rush to conclusions, since most sounds are a consequence of natural physical processes.
Modern models are equipped with powerful compressors and complex refrigerant circulation systems, which require time to reach operating mode after transportation. In this article we will analyze in detail the physics of the occurrence of various noises, separate design features from real malfunctions and explain in which cases the intervention of a specialist is really necessary.
Physics of compressor operation and refrigerant circulation
The main source of sound in any refrigerator is compressorwhich acts as a heart the entire cooling system. When first started after a long period of inactivity in a store or warehouse, the motor requires considerable time to pump freon through the system and reach nominal pressure levels, which is accompanied by a characteristic hum.
The sound of a running engine can vary from a barely audible whisper to a noticeable low-frequency hum, and this directly depends on the type of unit installed. Inverter models that smoothly regulate power usually operate quieter, while classic linear compressors can produce more pronounced vibration sounds when turning on and off.
In addition to the motor itself, sounds are produced by the refrigerant moving through the tubes, which is in a liquid or gaseous state in different parts of the system. The process of freon boiling in the evaporator and its condensation in the condenser is often accompanied by gurgling, overflowing and even a slight hissing, which is absolutely normal for a working device.
It is important to understand that thermostat periodically gives a command to start the compressor, and at these moments the noise level may briefly increase. If the refrigerator has just been plugged in, it will work almost non-stop until it cools the entire internal volume to the specified parameters, so in the first 6-10 hours the sound background may be more intense.
Influence of transportation and improper installation
One of the most common reasons for unexpected sounds is a violation of transportation and installation rules, which are often ignored when delivering large equipment. If the new refrigerator was transported in a horizontal position or strongly tilted, oil from the compressor could get into the refrigerant circulation circuit, which causes loud gurgling and water hammer when starting.
⚠️ Attention: After any transportation with an inclination of more than 40 degrees or in a lying position, the refrigerator should absolutely not be plugged in for at least 4-6 hours (or better yet, a day) so that the oil flows back into compressor crankcase.
The second critical factor is the geometry of the installation: if the refrigerator is not on a flat surface, vibration from the running motor is transmitted to the housing and is amplified by resonance. Uneven load on the legs leads to the fact that the device may sway slightly, and when the compressor is running, it begins to rattle or make a rhythmic knock on the floor or walls.
It is also necessary to take into account the distance to walls and furniture, since insufficient clearance disrupts the natural ventilation of the condenser. When hot air has nowhere to escape, the cooling system works with increased load, which leads to increased fan noise and louder compressor operation in an attempt to compensate for overheating.
☑️ Checking the installation of the refrigerator
Features of the No Frost system
Owners of models with the system No Frost often encounter with a set of sounds that are completely absent in old-style drip refrigerators. The main source of noise here is the fans, which forcefully circulate cold air inside the chambers, ensuring uniform cooling of products without the formation of ice.
The sound of a working fan may resemble the noise of a computer cooler or a slight howl, and its intensity depends on the speed of rotation of the blades. In some models with a freshness zone or separate cooling circuits, several fans can be installed, each of which contributes to the overall acoustic background of the device.
Another specific sound for the No Frost system is the crackling or clicking sound that occurs when the evaporator defrosts. The heating element heats the plastic housing of the evaporator, and due to the temperature difference, the materials expand or contract, emitting characteristic sounds similar to the crackling of plastic or ice.
Why can the fan hum louder than normal?
If the fan does not produce a uniform hum, but an intermittent noise or grinding noise, this may indicate icing of the blades or entry of a foreign object. Also, over time, the fan motor bearing may wear out, which will require its replacement.
It is worth noting that in modern models with Intelligent control the fan rotation speed can change dynamically depending on the load of the chambers and the frequency of door openings. If the temperature inside increases sharply (for example, after loading a large number of products), the system may go into turbo mode, which will temporarily increase the noise level.
Thermal expansion of body materials
Many users mistakenly mistake for a breakdown the sounds that arise due to thermal expansion and contraction of the materials from which the body and internal elements of the refrigerator are made. Plastic, metal and insulating foam react to temperature changes, producing clicks, crunches and short bursts of crackling sounds, especially in the first days of operation.
This process occurs most intensively in a new refrigerator, since the materials have not yet gone through the full heating and cooling cycle. Internal plastic shelves, drawers and bulkheads can also make sounds when their geometry changes, especially if there are heavy dishes on them that move along with the shelf.
Usually such sounds are chaotic in nature and are not strictly tied to the operating cycles of the compressor, although they are most often heard immediately after it is turned off or on. Over time, when the structure “gets used” to operating temperatures, the number of such sounds should decrease significantly, but they may never completely disappear.
Sound diagnostic table: normal or malfunction
To make it easier for you to navigate the variety of sounds, we have compiled a summary table that will help you quickly determine the nature of the noise. Remember that the context of a sound is often more important than its volume.
| Sound Type | Probable Cause | Status | Action |
|---|---|---|---|
| Uniform humming | Compressor operation | Normal | Observation |
| Gurgling, overflow | Freon movement | Normal | No action |
| Single clicks | Relay or thermostat | Normal | No action |
| Case vibration | Incorrect installation | Requires attention | Align legs |
| Loud metallic knocking | Tubes touching or breaking | Malfunction | Call a technician |
If you hear a sound that is classified as a malfunction, or a normal sound is accompanied by other alarming symptoms (case heating, lack of cold), it is necessary to conduct additional diagnostics. Tightness of the system is a key parameter, and any mechanical damage to the tubes during installation can lead to gas leakage.
When you need to contact a service center
Despite the fact that most sounds are safe, there are situations when you cannot remain silent and require professional diagnostics If a new refrigerator makes a high-pitched whistle, this may indicate a refrigerant leak through a microcrack, and further operation will lead to complete release of gas from the system.
A loud metallic clanging or knocking sound, especially if accompanied by strong vibration, may indicate that the compressor is not secured correctly or its internal components are being destroyed. In some cases, during transportation, the internal spring of the compressor suspension falls off, which leads to impacts on the walls of the casing at each start.
⚠️ Attention: If you smell burning or burning plastic at the same time as a new sound appears, immediately unplug the refrigerator and call a technician, as this may be a sign of overheating of the wiring or motor.
Also, the reason for contacting the service should be the appearance of sounds that increase over time. If on the first day the refrigerator was simply humming, and a week later it began to roar or rattle so much that it interferes with sleep, then the problem is not in adaptation, but in a developing malfunction.
Ways to reduce noise levels on your own
If the refrigerator is technically working, but the noise level still causes discomfort, you can take a number of measures to improve the acoustic comfort in the room. The first step should be to carefully adjust the support legs: make sure that the refrigerator is stable and does not wobble when lightly pressed on the corner.
Check whether the condenser tubes are touching the back of the case wall or each other - if you find contact, gently (without using force) move them apart to eliminate rattling. Also inspect the space around the refrigerator: sometimes foreign objects standing on the top panel or close to the sides begin to resonate and increase the noise.
For models with an open condenser (grid at the back), it is useful to clean the dust, since contamination of the radiator causes the fan and compressor to work harder. Regular maintenance helps maintain optimal temperature conditions for the engine, which has a positive effect on the level of noise emitted.
Is it possible to soundproof a refrigerator?
Experts do not recommend covering the refrigerator with soundproofing materials yourself, as this disrupts heat transfer and can lead to overheating of the compressor. It is better to ensure good ventilation around the device.
In conclusion, it is worth noting that a new refrigerator is a complex mechanism that requires a period of adaptation to the conditions of your home. The first 2-3 weeks of operation are a test a period during which operating sounds may be more pronounced than after a few months. Attentiveness to the equipment and proper installation will help you enjoy silence and fresh food without unnecessary worry.
Is it normal for the refrigerator to click when turning it on and off?
Yes, this is absolutely normal. The clicking sound is produced by a thermal relay that starts and stops the compressor, as well as a thermostat that responds to temperature changes. These sounds are normal for the operation of electromechanical control systems.
Why is a new refrigerator noisier than the old one?
Modern models often have more powerful compressors and a forced air circulation system (No Frost), which were not present in old “drip” refrigerators. In addition, over time, old units became overgrown with dust and lubricated by wear products, changing the nature of the sound, while the new mechanism works “dry” and clearly.
What to do if the refrigerator hums only at night?
At night, the general background noise in the apartment decreases, and the sounds of equipment operation become more noticeable to the ear. If the hum is uniform and is not accompanied by vibration, this is normal. Try to check the tightness of the products on the shelves - sometimes they can resonate.
Can the sound be a sign of incorrect voltage in the network?
Yes, a very low or high voltage in the electrical network can cause the compressor to operate incorrectly, which leads to a change in sound (humming, humming with overload). To protect equipment, it is recommended to use a voltage stabilizer or surge protector.