The appearance of new household appliances in the house should please you, but it is often accompanied by anxiety if the unit makes unusual sounds. The situation when a new refrigerator is very noisyoccurs quite often and does not always indicate a breakdown. Modern models, especially those equipped with inverter compressors or the No Frost system, have their own acoustic profile, which may differ from the usual hum of older devices.
The first thing the owner needs to do is not to panic and try to classify the source of the sound. This can be a monotonous hum, periodic gurgling, a sharp knock or a high-frequency whistle. Understanding the nature of sound is the key to solving the problem without calling a technician. In most cases, the reason lies in improper installation or natural processes of the refrigerant.
In this article we will examine in detail all the possible causes of acoustic discomfort, from a banal housing misalignment to serious compressor defects. You will learn how to carry out diagnostics yourself, what tools are needed to adjust the supports, and in which cases it is really necessary to contact a service center under warranty.
Natural sounds of refrigeration equipment
Many users mistakenly believe that a working refrigerator should operate absolutely silently. In fact, refrigerant circulation inside the system is a physical process that is inevitably accompanied by sound effects. If you hear a quiet gurgling sound, liquid pouring or a slight hissing sound, especially in the first hours after switching on, this is absolutely normal. Freon passes from liquid to gaseous state and back, passing through the capillary tube and evaporator.
It is also worth considering the operation of the system No Frost. In such models, a fan periodically turns on, which drives cold air through the chambers. Its sound can be similar to the howling of the wind or a uniform hum. In addition, when the evaporator defrosts, water can drip into a special tray, which causes characteristic “drip-drip” sounds or even a slight hiss when it hits a hot heating element. These sounds are not a sign of a malfunction.
Noise level standards according to GOST
According to technical regulations, the noise level of household refrigerators should not exceed 40 dB for conventional models and 35 dB for devices marked “quiet”. For comparison: a quiet conversation is 40 dB, and the rustling of leaves is 20 dB.
However, if the noise is intermittent, metallic in nature, or is accompanied by vibration of the body, which can be felt with your hand, it is worth conducting a more thorough check. It is important to distinguish operating hum from signs of mechanical wear or improper installation, since ignoring the latter can lead to accelerated failure of the equipment.
The influence of improper installation on noise level
The most common reason why a new refrigerator produces a strong hum or rattling is a violation of the installation rules. If the housing is not level, the compressor causes resonance during operation, causing the entire metal box to vibrate. As a result, you get the feeling that the equipment is working several times louder than it actually is. Vibration transmitted to the floor and walls, enhancing the acoustic effect.
It is critically important to ensure the necessary clearance between the back wall of the refrigerator and the wall of the room. The minimum distance should be at least 5-7 centimeters. If the condenser (black grille at the back) is too close to the wall, air circulation will be disrupted, which will lead not only to overheating of the compressor, but also to increased noise due to increased load on the motor.
☑️ Checking the installation of the refrigerator
Also pay attention to the surrounding objects. Shelves nearby, dishes on the countertop or decorative elements can resonate with the frequency of the compressor. Try to temporarily remove all objects within a meter radius of the unit and listen to whether the acoustic picture changes. Often it is foreign objects that create the illusion that the refrigerator itself is malfunctioning.
Adjusting the support legs and eliminating distortions
To eliminate vibration caused by uneven floors, manufacturers equip refrigerators with adjustable support legs. Usually there are two screw supports in front that allow you to set the horizontal. If the refrigerator wobbles with a slight push, it means that it is unstable, and the compressor has to work hard to overcome the imbalance.
To adjust, you will need an adjustable wrench or pliers. Rotate the front legs until the body is slightly raised at the front. This will ensure the doors close automatically and reduce the load on the hinges. After adjustment, push the refrigerator firmly at the top - it should swing and return to its original position, but not wobble freely.
⚠️ Attention: Never leave the refrigerator in a completely horizontal position without fixing it. Even a microscopic misalignment can cause oil from the compressor to begin to flow into the cooling circuit, which will cause water hammer and failure of the unit.
If the floor in the room is very uneven and the legs do not help, place a dense material under them, for example, a piece of rubber or linoleum. This will also help dampen vibration. Make sure the rear fixed feet are also firmly in contact with the floor. Some models require removal of shipping plugs from the legs before installation.
Transportation bolts and fasteners
During transportation, the refrigerator compressor is secured with special transport bolts or springs to prevent damage from impacts. On some models, these clips must be removed before turning on; on others, they remain, but may be too tight, transmitting vibration to the chassis. Check the instructions for your model Indesit, Bosch or LG for the presence of such elements.
In addition, inspect the interior space. Shaking shelves, loose egg trays or bottles in the door can create a loud rattling sound. Remove all food and shelves, turn on the empty refrigerator. If the noise disappears, then the problem was content resonance. Use silicone gaskets under glass shelves if they begin to rattle over time.
Pay special attention to the tubes at the back of the unit. During careless transportation, they could move and come into contact with each other or with the cabinet wall. When the compressor operates, the tubes vibrate, and their collision creates a loud metallic clang. Carefully, trying not to bend them, separate the tubes or place soft material between them (foam rubber sponge, a piece of rubber).
Diagnostics of the compressor and electrical part
If all external factors are excluded, and the refrigerator continues to make a lot of noise, perhaps the problem lies in the very heart of the unit - the compressor. New inverter models operate differently than older linear models. They do not turn off completely, but change power, so they can produce a low-frequency hum that can be heard in silence. However, a loud knock, clanging or howling indicates a malfunction.
There are several characteristic signs of problems with the compressor:
- 🔨 Metallic knocking at startup - may indicate wear of internal parts or problems with the start relay.
- 📢 Loud hum, which is increasing - a sign that the compressor is overloaded, possibly due to a lack of freon or contamination of the condenser.
- ⚡ Clicking and humming without starting - the engine is trying to start, but the starting relay does not work or the winding is faulty.
It is also worth checking the voltage in the network. If it is unstable or too low, the compressor may hum more than usual while trying to start. In regions with poor power quality, it is recommended to use a voltage stabilizer, since surges can quickly damage an expensive motor.
Comparative table of noise types and causes
For quick diagnosis, use the following table. It will help to compare the audible sound with the probable cause and determine further actions.
| Sound type | Probable cause | Danger | Actions |
|---|---|---|---|
| Gurgling, transfusion | Movement of freon through the system | No (Normal) | Do nothing |
| Vibration of the body, hum | Legs are not aligned, skew | Average | Adjust supports |
| Rattling of shelves | Resonance of objects inside | No | Correct content |
| Loud knocking, clanging | Compressor malfunction | High | Call a technician |
| Whistling or squeaking | Freon leakage, fan operation | Medium/High | Check tightness |
Please note that if the refrigerator is new, any interventions in the cooling system (replacing freon, soldering pipes) should only be carried out by authorized service centers. Self-repair will lead to loss of warranty.
When you need to contact a service center
There are a number of situations when independent actions are useless or dangerous. If, after checking the installation, aligning the legs and unloading the chambers, the noise level has not decreased, and the nature of the sound indicates a mechanical failure, you must file a claim for warranty service. The new refrigerator is protected by the consumer rights law.
⚠️ Attention: If you notice a smell of burnt wiring, a melted plug or sparking in the compressor area, immediately unplug the appliance! Operation of such a device is prohibited due to the risk of fire.
Do not attempt to disassemble the compressor or open sealed tubes yourself. The refrigerant may be under pressure, and modern oils are hygroscopic (absorb moisture), which, if air enters the system, will lead to the formation of acid and rapid combustion of the motor. The warranty period is your right to free elimination of factory defects, do not miss it.
When calling a technician, describe the nature of the noise as accurately as possible. Tell me when it appears (immediately, after a while, periodically) and what you have already tried to do. This will help the specialist take with him the necessary spare parts and tools, which will speed up the repair.
Frequently asked questions (FAQ)
Why is the new refrigerator noisier than the old one?
Modern models often have more powerful compressors for faster cooling and maintaining an accurate temperature. In addition, old refrigerators “break in” over time, but in new ones all the parts are fresh and can make louder sounds until they are fully adapted. The material of the case also plays a role - thin steel resonates more strongly.
Is it possible to put a refrigerator on its side during transportation if it is noisy?
It is strictly forbidden to put a working or just working refrigerator on its side without observing the time intervals. Oil from the compressor flows into the circuit. If you turn on such a unit, the compressor will try to push liquid (water hammer), which will lead to breakdown. After transportation on its side, the refrigerator should stand vertically for 4 to 24 hours.
How long can the refrigerator hum after the first start-up?
The first start can last up to 2 hours of continuous operation until the temperature rises. The noise may be more noticeable during this time. If the loud hum does not stop after the temperature rises and goes into standby mode (when the motor should be silent or running very quietly), this is a cause for concern.
Does the amount of food affect the noise level?
Yes, it does. An empty refrigerator may make a louder noise due to the resonance of empty shelves and the lack of sound-absorbing mass of food. However, overload is also harmful: if food touches the back wall or interferes with air circulation, the fan can work harder and noisier.
What to do if the refrigerator is in a niche and is noisy?
Installation in a niche requires special attention to ventilation. Make sure there are clearances on the sides and top as specified in the instructions. If the niche is deaf, the noise will be amplified by the echo effect. In such cases, it is recommended to cover the side walls of the niche with sound-absorbing material or increase the indentations.