A sharp change in the acoustic background in the kitchen, when the usual smooth hum is replaced by an obsessive hum or loud knock, always causes concern for the owner of household appliances. Refrigerator noise can signal either a banal misalignment of the housing or serious problems with the compressor or refrigerant removal system. You should not ignore these sounds, since early diagnosis allows you to avoid expensive repairs or complete replacement of the unit.
In most cases, the causes of extraneous sounds lie in violation of operating rules or natural wear of individual components. Modern models The No Frost system works differently than old two-chamber units with drip defrosting, and make specific sounds, which are not always a sign of failure. Understanding the physics of compressor operation and freon circulation will help you distinguish normal operating mode from a critical malfunction.
Next we will look in detail at why equipment makes different types of sounds, how to carry out initial diagnostics on your own and in which cases it is necessary to call a specialist.
Acoustic norm: as it should sound of a working unit
Before you panic, you need to determine whether the current noise level is normal for your model. Any operating refrigerator makes sounds caused by vibration of the engine, the flow of refrigerant through the tubes and the operation of fans. Normal operating noise usually a smooth, monotonous hum, the level of which does not exceed 40 dB, which is comparable to a quiet conversation.
However, there are different types compressors work differently. The inverter models that now dominate the market are virtually silent in keep-warm mode, but can produce a low-frequency hum when turned on suddenly. Old linear compressors operate cyclically: a loud start, an active phase and silence during idle time.
It is worth considering that an empty refrigerator is noisier than a fully loaded refrigerator. The products act as an additional sound absorber and temperature stabilizer, reducing the frequency of engine starts. If you have just installed the equipment or defrosted it, the noise level in the first day may be higher than usual.
External factors: installation and vibration of the case
One of the most common reasons why the refrigerator began to make more noise than usual is improper installation. Vibration from a running compressor is transmitted to the housing, and then to the floor and walls, creating resonance. If the unit is not level, the vibration increases many times over, causing rattling of doors and shelves.
To eliminate this problem, you need to check the horizontal installation. Use a building level or simply rock the body so that it stands stable on all four support legs. Height adjustment is done by twisting or twisting the front legs, which allows you to compensate for uneven floors.
☑️ Checking the installation of the refrigerator
It is also important to check the distance to the nearest pieces of furniture and walls. Rear condenser grille requires free air flow for effective heat exchange. If the refrigerator is moved close to the wall or cabinets, it begins to overheat, the compressor works harder and noisier, and an echo effect occurs.
⚠️ Attention: Do not install the refrigerator in a niche without proper ventilation. Overheating of the compressor due to poor air circulation shortens the service life of the equipment and increases energy consumption.
Characteristic sounds and their significance for diagnostics
An experienced technician can determine the malfunction simply by the sound that the unit makes. Different types of noise indicate specific components that require attention. Let's look at the main types of sounds and their probable causes.
| Sound type | Probable cause | Degree of danger |
|---|---|---|
| Loud humming | Compressor wear or bad ventilation | Medium |
| Crackling and clicking | Thermal expansion of plastic or relay | Low (normal) |
| Gurgling | Freon circulation in the tubes | Normal |
| Whistling | Fan malfunction or freon leak | High |
| Knock metal | Destruction of the compressor suspension | Critical |
If you hear a periodic crackling sound reminiscent of the crackling of wood or plastic, most likely this is a normal process. The materials used to make the inner box and outer panels expand and contract with temperature changes. This happens especially often immediately after turning off or turning on the cooling cycle.
The situation changes if the crackling sound is accompanied by clicks, after which the refrigerator stalls. This may indicate a problem with the compressor start relay, which tries but fails to start the engine. In this case, the relay needs to be replaced, which is a relatively inexpensive repair.
Why does the relay click?
The starting relay is responsible for supplying a starting pulse to the motor winding. If it is faulty or the contacts are burnt, a characteristic click is heard, followed by an attempt to start and immediate shutdown of the protection. Frequent clicks indicate that the motor cannot reach the required speed.
Problems with the No Frost system and fans
In refrigerators with the No Frost and Full No Frost system, fans are responsible for circulating cold air. Over time, malfunctions may occur in their operation, which manifest themselves in the form of a whistle, howl or hum. Most often, the problem lies in the drying out of the bearing grease or the ingress of foreign objects.
If the fan begins to hum, this means that its axis is skewed or the bearing has exhausted its service life. In some cases, ice builds up on the fan blades, disrupting the balance and causing whipping. To eliminate the malfunction, it is often necessary to defrost the unit during the day.
Checking the fan requires partial disassembly of the freezer or refrigerator compartment. It is necessary to remove the back panel, gain access to the motor and check the ease of rotation of the blades. If resistance is felt or a grinding noise is heard, the part must be replaced.
⚠️ Attention: Before checking the internal components, be sure to disconnect the refrigerator from the electrical outlet. Working with electrical appliances under voltage is life-threatening.
When the compressor makes noise: wear and tear
The compressor is the heart of the refrigerator, and its operation is always accompanied by vibration. However, if the humming becomes unbearably loud, becomes a howling sound, or is accompanied by strong floor vibrations, this is a sign of serious wear and tear. The internal mechanisms of the motor may have lost their tightness or received mechanical damage.
A frequent cause of noise is the destruction of the internal suspension of the compressor. The engine inside a metal casing is suspended on springs that dampen vibrations. If one of the springs bursts or jumps off, the motor begins to bang against the walls of the casing, producing a loud metallic clanging sound, especially when starting and stopping.
It is also worth paying attention to the condition of the tubes. If they touch each other or the walls of the case, vibration will be transmitted to them, creating a ringing effect. By carefully bending the tubes by hand (only if they are not hot and you are confident in your actions), you can temporarily reduce the noise level, but it is better to secure them with special clamps.
Instructions: how to reduce the noise level with your own hands
If your refrigerator starts to make noise, do not rush to call a technician. In many cases, you can solve the problem yourself by following a series of simple steps. Follow this algorithm to try to eliminate the annoying sound.
The first step should always be complete defrosting. Even if you have a No Frost system, ice could form in hidden cavities. Unplug the unit, open the doors and leave for at least 12-24 hours. This will allow the ice to melt and the system to come into balance.
☑️ Algorithm for action in case of noise
After defrosting, thoroughly wipe all surfaces and check the stability of the internal shelves and drawers. Not only parts of the refrigerator itself can rattle, but also bottles or cans standing on the door. Make sure that there is a gap between the products and the walls.
Pay special attention to the rear of the unit. There is a condenser grille, which often becomes clogged with dust and pet hair. A clogged grille impairs heat transfer, causing the compressor to wear out. Carefully vacuum the back wall using a soft nozzle.
Prevention and care of equipment
To ensure that the question “why the refrigerator started making noise” does not arise for as long as possible, it is necessary to regularly carry out preventive maintenance. Cleanliness and proper operating conditions are the key to long and quiet operation of household appliances.
Regularly check the condition of the rubber seals on the doors. If they do not fit tightly, warm air enters the chamber, the temperature inside rises, and the compressor is forced to work almost non-stop. This not only increases noise, but also leads to excessive energy consumption.
Do not overload the refrigerator with food. Although a full chamber is less noisy, excess load on shelves and doors can lead to their deformation and the emergence of new sources of squeaking. Distribute the weight evenly and make sure that heavy objects do not create distortion.
Is it normal if the refrigerator makes noise immediately after turning it on?
Yes, this is normal. At the moment of startup, the compressor operates at maximum speed to quickly reach the desired temperature. Also at this moment the operation of the refrigerant is most audible. After 10-15 minutes, the noise level should decrease.
Can an old refrigerator start to make more noise than a new one?
Certainly. Over time, the fan bearings wear out, the lubricant in the compressor dries out, and the mountings and suspension springs weaken. The aging of materials also affects the sound insulation of the case.
Does the amount of food in the refrigerator affect the noise level?
Yes, it does. An empty refrigerator has more free space for sound waves to resonate. Products absorb some of the sound vibrations. However, a crowded refrigerator can impede air circulation, causing the fan to work harder.
What to do if the noise does not disappear after defrosting?
If defrosting and leveling did not help, the problem is likely of a technical nature. It is necessary to check the fans, the condition of the compressor and the start relay. In this case, it is recommended to contact a service center for professional diagnostics.