Buying a new refrigerator is always a joyful event, marking the beginning of a more comfortable life in the kitchen, but the euphoria of the purchase often gives way to anxiety when the device begins to make strange sounds. Instead of the expected silence or a smooth, barely noticeable hum, the owner hears gurgling, clicking, whistling or even a loud hum, which makes you doubt the serviceability of the equipment and the correct choice of model. In most cases, such manifestations are an absolutely normal part of the operation of modern climate control equipment, but sometimes they can actually signal hidden defects or installation errors.
Modern models of refrigeration equipment, especially those that operate on innovative refrigerants and are equipped with No Frost systems, operate on complex physical principles that may be unusual to the ears of a person accustomed to old Soviet units. Understanding the nature of the occurrence of various acoustic effects will help you distinguish the normal operation of the compressor or the circulation of freon from a real breakdown that requires the intervention of a service center. Let's look at the main causes of noise and determine when to sound the alarm and when to just wait.
Physics of the process: normal sounds of a working unit
The first thing that the owner of a new device needs to realize is that completely silent refrigerators does not exist in nature, since the operation of the compressor is inevitably accompanied by vibration and hum. Modern manufacturers strive to minimize noise levels, but the physics of the process of compression and expansion of the refrigerant requires certain sounds, which can vary from a quiet hiss to periodic rumbling. If you hear a uniform low-frequency hum, which either subsides or intensifies, this indicates the normal start-up and operation of compressor unit.
Particularly often questions are raised by the gurgling or pouring of water inside the case, which is actually sound circulation refrigerant through the tubes of the evaporator and condenser. Liquid freon, turning into a gaseous state and back, creates characteristic sounds that can be heard even through the thick walls of the chamber, especially at night, when there is silence in the apartment. Also considered normal are periodic clicks produced by the thermostat or relay when the compressor is turned on and off to maintain the set temperature.
It is important to consider that new models are often equipped with more powerful and efficient motors that can work more intensely than older analogues, while creating a more noticeable, but technically correct background noise. If the sound is monotonous and does not cause physical discomfort at a distance of one meter from the equipment, then most likely everything is fine with your refrigerator.
⚠️ Attention: If the hum is accompanied by strong vibration that is transmitted to the floor or furniture, this may indicate incorrect installation, and not a motor breakdown.
Errors during installation and installation equipment
One of the most common causes of excess noise, which owners mistakenly mistake for a defect, is a violation of the rules for the initial installation of the device. Unstable position a refrigerator on the floor leads to the fact that the slightest vibration from a running compressor is amplified by the resonance of the housing, creating rattling and knocking. Even if the unit is visually standing level, a microscopic misalignment can cause the internal elements to beat against the walls of the case or against each other.
The critically important point is the distance between the back wall of the refrigerator and the wall of the room or other pieces of furniture. If the necessary ventilation clearanceis broken, hot air cannot circulate freely around the condenser, which causes the compressor to work harder and produce louder sounds. In addition, insufficient spacing can cause vibration to be transmitted to the wall, causing a resonating hum throughout the room.
It is also worth checking to see if the external parts of the refrigerator, such as decorative panels or handles, are not touching adjacent pieces of furniture or kitchen cabinets. When the compressor operates, a microscopic displacement of the housing occurs, which, when in close contact, turns into an annoying creaking or knocking noise, which can be easily eliminated by simply moving the equipment a couple of centimeters.
☑️ Checking the correct installation
The influence of the No Frost defrosting system on acoustics
Refrigerators equipped with the system No Frost (or Full No Frost), have a fundamentally different internal structure compared to classic drip models, which directly affects the range of sounds they produce. In such units, a fan is constantly running, which drives cold air through a system of channels, and the sound of its rotation can be heard by the user as a uniform hum or whistle. This is an absolutely normal phenomenon, which indicates proper circulation of air masses inside the chambers.
Another specific sound for the No Frost system is a crackling or clicking sound that occurs when the automatic defrosting system starts. At this moment TEN (heating element) it begins to heat up, and due to the thermal expansion of plastic or metal, characteristic sounds may be heard, reminiscent of the crackling of plastic or even gunshots. Users are often frightened by these sounds, especially if they are heard at night, but for modern models this is a normal situation.
It is worth noting that the intensity of the fan sound may vary depending on whether the refrigerator door is open or closed. In some models, when the door is opened, the fan stops and the sound disappears, which is a good diagnostic sign: if the noise stops when the door is opened, then the problem is in the air circulation system, and not in the compressor.
Why does plastic crack?
Cracking plastic in No Frost refrigerators is often caused by a sharp temperature change. The inner walls of the chamber are cooled to minus values, and upon contact with warm air or when the defrosting heating element operates, the material expands or contracts, making sounds. Over time, when the plastic “gets used” to the cycles, the sounds may become quieter.
Refrigerant characteristics and pressure in the system
The modern environmental agenda has led to manufacturers massively abandoning old types of freon in favor of new substances that are safer for the ozone layer, such as isobutane (R600a). This refrigerant has excellent refrigerating properties, but circulates through the system at a different pressure and speed than its predecessors, often accompanied by a more audible gurgling and gurgling sound. Many users mistakenly believe that their refrigerator is “boiling,” but in fact this is simply the active movement of gas through thin tubes.
The sounds produced by the new refrigerant may be more high-frequency and ringing, especially in the first weeks of operation, until the system is completely stabilized. The pressure in the circuit can fluctuate depending on the ambient temperature in the room and the amount of loaded products, which also affects the tone of the noise emitted. If you have recently replaced your old refrigerator with a new one running on R600a, you just need time to get used to the new acoustic background.
It is important to understand that the noise level also depends on the amount of refrigerant in the system: if there is not enough of it or, conversely, there is excess, the sounds may change, but in factory conditions this is strictly monitored. However, during transportation and first start-up, the gas takes some time to be evenly distributed throughout the entire volume of the system, so in the first hours of operation the sounds may be more chaotic.
| Sound type | Probable cause | Normal or defect |
|---|---|---|
| Uniform humming | Compressor operation | Normal |
| Gurgling, overflow | Freon movement | Normal |
| Crackling, clicks | Thermoregulator, defrosting | Normal |
| Metal clanging | Touching of tubes, compressor defect | Defect |
| Whistling, piercing noise | Fan malfunction | Defect |
Shipping bolts and internal vibration
Although this sounds like a platitude, one of the common causes of strong clatter in new washing machines and, less often, in refrigerators is forgotten transportation elements. On some models, the compressor may be rigidly secured with special bolts or brackets to protect against damage during delivery, and if these are not removed before first use, vibration will be transmitted to the entire housing with double the force. The instructions for any new equipment always contain a section on preparation for operation, which cannot be ignored.
Inside the refrigerator compartment, the source of rattling can be the products themselves or components that were not securely fastened. Glass shelves, if they do not have special rubber stops or are not laid tightly, can vibrate from the operation of the motor, creating the effect of “dancing dishes”. Bottles in door niches or egg trays behave similarly, which at a certain resonance begin to knock on the plastic.
Also check the back of the unit: there is a tray for collecting condensate, which can rattle if not seated tightly. Sometimes it is enough to simply straighten it with your hand or place a piece of foam rubber to eliminate extraneous sound. Also inspect the condenser grille on the back wall - if the tubes touch each other or the body, they need to be carefully (effortlessly!) separated.
When you need to call a technician: signs of breakdown
Despite the fact that most sounds are safe, there are situations when a new refrigerator really requires repair or replacement. Loud metal clanging or a knock that is heard immediately when the engine starts or stops can indicate mechanical damage to the compressor or broken internal valves. If the sound resembles metal hitting metal, operation should be stopped immediately.
Another alarming signal is a high-pitched whistle or howl that does not stop for a long time. This may indicate that frozen ice or a foreign object has been touched, or the motor bearing has failed. Unlike a quiet hum, this sound is constantly growing and cannot be ignored, as this can lead to the motor burning out. fan blades hit frozen ice or a foreign object, or the engine bearing failed. Unlike a quiet hum, this sound is constantly growing and cannot be ignored, as this can lead to a burnout of the motor.
You should also be wary if the refrigerator makes sounds, but does not cool, or if the on and off cycles have become too short and frequent. In this case, the noise is only an accompanying symptom of a more serious problem with thermoregulation or circuit tightness. In such cases, the manufacturer's warranty is your main tool for solving the problem.
⚠️ Attention: If you hear a burning smell or see sparking combined with unusual noise, immediately unplug the device and contact a service center.
Frequently asked questions (FAQ)
How long is the new one Can the refrigerator operate loudly after being turned on?
In the first 2-4 hours after the first turn on, the refrigerator can work almost non-stop, actively gaining temperature. During this period, the sounds of the compressor and freon circulation may be more intense. Complete stabilization of operation and “grinding in” of all components usually takes from 2 to 5 days.
Why does the refrigerator click when it is not working?
Clicks during the compressor rest period are most often caused by thermal expansion and contraction of the body materials or internal plastic parts due to temperature changes. This could also be the sound of ice thawing in the No Frost system, when a piece of ice falls into the tray.
Is it possible to reduce the noise of a new refrigerator yourself?
Yes, most often it is enough to level the refrigerator by tightening the legs and provide a gap of 5-10 cm from the walls. It also helps to install anti-vibration pads under the supports and make sure that the cabinet does not touch the kitchen furniture.
Is it normal for the refrigerator to make the sound of a popping bubble?
Yes, this is a characteristic sound for the R600a refrigerant. Gas bubbles, passing through the capillary tube and throttle, emit characteristic sounds similar to the bursting of bubbles or a quiet hiss. This is a sign of active operation of the cooling system.
What to do if the new refrigerator is noisier than the old one?
Modern models can be louder than older ones due to more powerful compressors and the lack of a thick layer of sound insulation, which was in Soviet technology. If the noise level does not exceed 40-45 dB (indicated in the passport) and there is no vibration of the floor, this complies with technical standards.