The appearance of an extraneous hum in the refrigerator is always a cause for concern, especially when it comes to popular brand appliances Biryusa. Users often encounter a situation where the device begins to emit a monotonous low-frequency sound that does not stop even at night. Unlike a sharp knock or crack, it is the hum that can be ignored by the owners for a long time, which sometimes leads to more serious damage.
However, it does not always continuous hum indicate a critical malfunction. In many cases, this is a natural feature of the operation of certain components or the result of improper installation of the unit. Understanding the physics of the process will help you save money on calling a technician if the problem is solved by simply adjusting the position of the housing.
In this article we will analyze in detail the mechanics of noise in various models of refrigerators, from classic two-chamber options to modern systems No Frost. You will learn to distinguish a normal operating sound from a malfunction signal, and will also receive a step-by-step algorithm of actions for diagnosis.
Natural causes of hum
Before you panic and look for a service center number, you must rule out natural causes. Modern compressors, especially inverter types, operate on a different principle than older models. Uniform hum This may be a sign that the cooling system has returned to operating mode after defrosting or loading warm products.
Often the source of the sound is the refrigerant circulating through the pipes evaporator. As freon passes through the capillary tube and expansion valve, a characteristic hissing or gurgling sound occurs, which can be perceived as a buzzing sound. This is absolutely normal for any equipment, be it Biryusa 133 or a newer model.
- 🔊 Refrigerant circulation: The sound of liquid flowing in the tubes, which intensifies immediately after turning on the compressor.
- ❄️ No Frost system operation: In models with automatic defrosting, the fan may create aerodynamic noise similar to a hum.
- 🔄 Thermal expansion: The plastic and metal of the case expand and contract with temperature changes, producing background sounds.
How to distinguish normal sound from a breakdown?
Normal operating sound is uniform, quiet and does not change sharply in volume. If the hum increases, becomes intermittent, or is accompanied by vibration of the housing, this is a sign of a malfunction.
It is important to understand that manufacturers of household appliances a certain level of sound pressure is allowed. If your refrigerator produces a sound within the range of 38-42 dB, this is within the technical standards. A loud hum most often indicates that the unit is operating in extreme mode or that something is interfering with it.
The influence of incorrect installation on the noise level
One of the most common reasons why a hum Biryusa refrigeratoris a banal violation of the rules installation Vibration from a running motor is transmitted to the body, and then to the floor and walls, creating a resonance effect. If the unit is not level, the load on the compressor is distributed unevenly, which increases the hum.
Check the location of the refrigerator. It must stand strictly horizontally. Even a slight tilt can cause the door to become loose, causing the compressor to run continuously trying to maintain temperature. This causes overheating and increased background sound.
☑️ Checking the installation
⚠️ Attention: Do not move the refrigerator close to the wall. The gap is necessary for free air circulation around the condenser. Violation of this rule leads to overheating and increased hum.
It is also worth checking whether the refrigerator body is touching adjacent furniture or kitchen cabinets. Vibration is easily transmitted through contact points, turning a quiet hum into a loud, resonating sound. It is enough to move the unit a couple of centimeters to fix the problem.
Diagnostics of the compressor: normal or broken?
The heart of any refrigerator is the compressor. It is this unit that creates the main sound pressure. If you hear that the motor hums louder than usual, it is necessary to conduct an initial diagnosis. In old Biryusa models, piston compressors were often installed, which by their nature are noisier than modern analogues.
Pay attention to the nature of the sound. If the hum is steady but very loud, the internal bearings or bushings of the motor may be worn out. If the sound is intermittent, with a metallic clang or hum, turning into a howl, this may indicate an interturn short circuit of the windings or destruction of the piston group.
| Type of sound | Probable cause | Degree of danger |
|---|---|---|
| Uniform low-frequency hum | Normal operation or overload | Low |
| Hum with body vibration | Incorrect installation, worn shock absorbers | Medium |
| Intermittent hum with clicks | Malfunction of the starting relay | High |
| Strong hum without cooling | Stuck compressor | Critical |
In some cases, the compressor noise increases due to problems with the electrical part. Power surges in the network can lead to unstable operation of the engine, which is reflected in a change in the tone of the sound. Using a voltage stabilizer can extend the life of your Biryusa unit Biryusa unit.
Problems with the fan in the No Frost system
In Biryusa refrigerator models equipped with the system No Frost, a significant part of the noise is created by the fan. It circulates cold air through the chambers. Over time, fan bearings can dry out or become dirty, which leads to an unpleasant humming sound.
Often users notice that the hum increases when the door is opened or, conversely, subsides. This is due to the fact that in some models the fan must stop when the door is opened. If the door sensor is faulty or the mechanism is stuck, the sound may change unpredictably.
- 🌀 Icing of the blades: Ice on the fan causes imbalance and hum when rotating.
- 🛑 Bearing wear: Dry running of the bushing creates a monotonous howling sound.
- 🌬️ Contamination of air ducts: Dust and debris in the channel create aerodynamic noise.
For diagnostics, you need to defrost the refrigerator (turn it off for 10-12 hours). If, after complete defrosting, the hum disappeared and appeared again only after a few days of operation, then the problem lies in the melt water drainage system or a malfunction of the evaporator heating element, which leads to ice freezing on the fan.
Resonance of pipelines and internal elements
Sometimes the source of the hum lies not in the engine, but in the tubes through which freon circulates. During operation, the compressor creates vibration, which is transmitted to the copper tubes. If they are too close to each other or touch the body, a resonating hum will occur.
To fix this problem, access to the rear panel of the refrigerator is required. Visually inspect the tubes: are there any points of contact? It is often enough to carefully (with your hands, without tools!) separate the tubes or place a piece of porous material between them to eliminate contact.
⚠️ Attention: Be extremely careful when working with the condenser and evaporator tubes. Copper is very soft, and any careless movement can lead to a puncture and leakage of freon. If you are not confident in your abilities, do not touch the tubes.
Also check the condensate tray located above the compressor. If it is loose or deformed, vibration from the motor will cause it to rattle and hum. Sometimes it is enough to simply correct its position or seal the gaps.
When you need to call a specialist
There are situations when independent repair is not only ineffective, but also dangerous. If after checking the installation, defrosting and visual inspection the hum of the Biryusa refrigerator the problem persists and intensifies, a professional diagnosis is probably required. Especially if the sound is accompanied by the absence of cold or the appearance of a burning smell.
Specialists use special equipment to measure the pressure in the system and the current strength of the compressor windings. This allows you to accurately determine whether you need to replace the motor, refill with freon, or repair the electronic control board.
You should not ignore the problem if the hum is accompanied by heating of the housing in the motor area. This may indicate that the compressor is working at its limit and will soon fail. A timely call to a service center can save equipment from an expensive replacement of the unit.
Why does the old Biryusa refrigerator hum louder than the new one?
Over time, the mechanical parts of the compressor wear out, the rubber shock absorbers dry out, and the tubes lose their rigidity. In addition, older models were structurally noisier due to less advanced insulation technologies and motors.
Can a hum be a sign of a freon leak?
A freon leak itself does not cause a hum. However, if the refrigerant becomes low, the compressor starts working continuously, trying to build up the temperature. Long-term operation without stopping leads to overheating and increased sound.
Is it normal for the refrigerator to hum immediately after switching on?
Yes, in the first minutes of operation the compressor may hum louder, since it starts under load in order to quickly cool the chamber. After 10-15 minutes, the sound should become quieter and more uniform.