Suddenly appearing or increasing noise from the refrigerator can turn a quiet rest into torture. Many users notice that their equipment begins to hum, click, or make strange gurgling sounds, especially at night. In some cases, this is a variant of the norm, but often such signals indicate malfunctions of internal componentsthat require intervention.
Understanding the nature of sound is the first step to solving the problem. If you are wondering why the refrigerator makes noise during operation, it is important to analyze the nature of the sound, its frequency and localization. Bosch, LG or Indesit equipment may have its own design features, but the physics of the processes is similar for all models. Ignoring a loud hum can lead to breakdown of an expensive compressor.
In this article we will analyze the main causes of extraneous sounds, from a banal uneven installation to complex problems with refrigerant. You will learn which sounds are considered acceptable, and which ones require an urgent call to a specialist. We have also prepared practical tips for self-diagnosis and elimination of simple defects.
Physics of sound: when noise is the norm
Modern refrigerators, especially models with the system No Frost, emit specific sounds during normal operation. The transition of the refrigerant from a liquid to a gaseous state is accompanied by a characteristic gurgling or overflow of water. This sound is often heard immediately after the compressor stops or while it is running.
It is also normal to hear a periodic clicking sound produced by the thermostat or protection relay when the engine is turned on and off. If you hear a quiet hum from the fan in the freezer, this indicates proper air circulation. It is important to distinguish these operating noises from mechanical grinding or vibration.
⚠️ Attention: If the sound appeared immediately after purchasing new equipment, let the refrigerator sit for 2-4 hours before turning it on. The oil in the compressor must drain into the crankcase, otherwise water hammer and loud noise are possible.
Why can a new refrigerator make noise louder than an old one?
New models often use more powerful compressors and environmentally friendly refrigerants that can circulate under higher pressure, creating a more audible flow of liquid in the tubes. In addition, the lack of carbon deposits and wear in new moving parts can change the acoustics of the mechanism.
The table below shows the types of sounds that should not cause panic in the owner:
| Sound type | Probable cause | Danger |
|---|---|---|
| Quiet bubbling | Freon circulation | No |
| Single click | Thermostat operation | No |
| Hum fan | No Frost system | No |
| Plastic cracking | Thermal expansion | No |
Problems with installation and vibration housing
One of the most common reasons why the refrigerator hums and vibrates a lot is improper installation. If the body is skewed or the legs are not adjusted, resonance occurs. Vibration from a running compressor is transmitted to the floor and walls, amplifying the sound many times over.
Check the horizontal installation using a building level. Even a slight tilt can cause the door to not fit tightly and the body to resonate. Often, users forget to remove shipping bolts or substrates, which also cause vibration noise.
☑️ Diagnostics of refrigerator installation
Make sure that the back wall of the refrigerator does not touch the wall or furniture. The minimum distance should be 5-10 cm for free air circulation. If the refrigerator is on a slippery floor (linoleum, tiles), vibration can be transmitted to the entire room.
Sometimes foreign objects that have fallen behind the refrigerator or are on its lid begin to rattle from vibration. Inspect the space around the equipment. If you find that the noise is caused by shaking, place special anti-vibration mats or rubber pads under the legs.
Malfunctions of the compressor and start relay
The compressor is the heart of the refrigerator, and it is it that creates the main level noise. If you hear a loud, increasing hum that ends abruptly with a click, there is most likely a problem with the start relay or the motor windings. The engine tries to start, but cannot gain speed.
Wear of the compressor also leads to a metallic knock or clanging sound inside the housing. This indicates that bearings or the piston group has exhausted its service life. In such cases, repair is often not economically feasible, and replacement of the unit is required.
⚠️ Attention: If the compressor hums but does not start, and it is warm inside the refrigerator, immediately unplug the appliance. Continuing to operate in this mode can lead to combustion of the windings and a fire.
It is important to note that inverter compressors, which are found in models LG, Samsung and other brands, operate quieter than usual, since they do not turn off completely. However, when they break down, the nature of the sound changes to a piercing whistle or high-frequency howl.
Noise in the No Frost system and fan
Refrigerators with automatic defrosting are equipped with fans that drive cold air through the chambers. Over time, the rotating parts of the mechanism wear out, resulting in a whining or humming noise. Often the problem lies in the fan bearing.
Another reason for noise in the system No Frost is ice freezing on the fan blades. If the drainage hole is clogged, the water does not drain, freezes on the evaporator and enters the fan rotation zone. In this case, you will hear a crackling or knocking sound, reminiscent of the operation of a propeller.
To fix the problem, defrosting the refrigerator during the day is often required. If after complete defrosting the noise returns, you need to check the serviceability of Defrost heating element the sensor. In some cases, the fan blades may touch the overgrown “fur coat” due to a violation of the door seal.
It is important to distinguish between the noise of the evaporator and the noise of the fan. The evaporator may crack slightly as the metal expands, but a continuous mechanical sound indicates contact between moving parts and a foreign object or ice.
Refrigerant and Tube Problems
If the refrigerator makes sounds that sound like bubbles popping or water pouring, this may indicate a freon leak or air in the system. Under normal conditions, the refrigerant circulates silently, but when the pressure drops or the state of aggregation changes, the noise increases.
Sometimes the cooling system tubes may touch each other or the walls of the housing. Vibration during compressor operation causes them to collide, creating a metallic ringing sound. By carefully straightening the tubes with your hands (only when the device is turned off!), you can eliminate this defect.
A clogged capillary tube also changes the character of the sound. The refrigerant has difficulty passing through the narrow opening, creating a characteristic hissing sound. This is a complex malfunction that requires professional cleaning of the system and replacement of the filter-drier.
Comparative analysis of the causes of noise
For quick diagnosis, you can use a summary table that will help classify the problem by type of sound and accompanying symptoms. This will allow you to decide whether to repair it yourself or call a specialist.
| Symptom | Probable cause | Action |
|---|---|---|
| Loud hum + vibration | Incorrect installation | Align the legs |
| Knocking + does not freeze | Faulty compressor | Call a technician |
| Crackling noise in the freezer | Ice on the fan | Defrost for a day |
| Relay clicks | Start relay | Replacing the relay |
Do not ignore changes in the sound background of operation technology. If the characteristic hum changes to an intermittent one or a new tone of sound appears, this is a signal of a developing malfunction. Early diagnosis helps avoid costly repairs.
⚠️ Attention: Do not attempt to solder pipes yourself or open a sealed circuit without a license and equipment. This is dangerous to health and can permanently damage the refrigerator.
Remember that the operating life of the refrigerator directly depends on the operating conditions. Regularly cleaning the condenser at the back of the device from dust also reduces the load on the compressor, making it work quieter and more efficiently.
Does the fullness of the refrigerator affect the noise?
Yes, partially. An empty refrigerator cycles more often because the air heats up faster when the door is opened. The products act as heat accumulators, stabilizing the temperature and reducing the frequency of compressor starts.
Frequently asked questions (FAQ)
Why did the refrigerator start to make noise after defrosting?
Often after defrosting, water remains in the drainage system, which forms ice when frozen traffic jams When the fan is running, ice may break off and create noise. It is also possible for water to get into electrical contacts, causing a short circuit or sparking. Allow the appliance to dry completely (24 hours) before turning it on.
Is it normal for the refrigerator to hum only at night?
During the day, extraneous noise can be masked by household noise. At night, in silence, even the standard hum of the compressor becomes audible. If the sound is uniform and is not accompanied by vibration of the body, this is normal. If at night the sound becomes piercing, check the alignment of the legs.
Can an old refrigerator be quieter than a new one?
Paradoxically, but yes. Old models with conventional compressors operate in cycles: on and off. New inverter models operate constantly, but at low speeds. However, wear on the shock absorbers of an old compressor can lead to knocking noises, which are perceived as a louder noise.
What to do if the refrigerator is humming and does not turn off?
This is a sign that it is not reaching the desired temperature. Check the tightness of the door seal, the integrity of the seal and the room temperature. If the equipment works non-stop for more than 12 hours, this can lead to overheating and breakdown.
How to reduce the noise of a refrigerator with your own hands?
Move the equipment away from the wall, check that it does not wobble. You can stick a noise-insulating material (vibroplast) on the inner walls, but only heat-resistant material. Make sure that the dishes inside do not rattle on the shelves.