The situation when the refrigerator gurgles when the door is closedis familiar to many owners of household appliances. This specific sound can range from a quiet pouring of water to a loud bubbling sound, reminiscent of boiling liquid. For most users, such an acoustic effect becomes a cause for concern, causing them to think about a possible breakdown or leak of refrigerant.
However, rushing to conclusions and calling a technician is not always advisable. B 90% of cases, gurgling is an absolutely normal physical processrelated to the circulation of refrigerant in the system. Understanding the device compressor-condensing unit will help you distinguish the normal operation of the equipment from a real malfunction that requires intervention.
In this article we will analyze in detail the physics of its occurrence sounds, let's analyze the operation of thermostatic valve the condensate drainage system. You will learn to determine when noise indicates correct functioning, and in which cases urgent diagnosis of the refrigeration circuit is required.
Physics of the process: refrigerant circulation
The main cause of sound effects inside the fridge compartment there is movement refrigerant through the evaporator tubes. Modern models, such as LG, Samsung or Boschuse an inverter or classic compressor system, where freon constantly circulates, changing its state of aggregation.
When you close the door, there is a sharp change in pressure inside sealed volume. This provokes an abrupt movement of liquid freon into the gas phase and vice versa. It is this process, passing through the capillary tube evaporator, that creates the characteristic gurgling sound. The sound may intensify if the equipment has just turned on or, conversely, is finishing the cooling cycle.
It is important to understand that there are no voids in the system. The tubes are filled with oil and gas under pressure. The sounds of overflow indicate that refrigerant circulation it is not broken and the compressor is working properly. If the system were empty, you would only hear the hum of the motor or silence, but not the overflow of liquid.
The role of the No Frost and defrost system
Owners of equipment with the system No Frost or Low Frost face gurgling more often than others. This is due to the presence of an additional melt water removal circuit and periodic defrosting cycles. When the door closes, the air flows inside the chamber are redistributed, which can activate the movement of moisture in the drainage channels.
During the period automatic defrosting condensation accumulates on the evaporator, which then flows into a special pan. If you close the door at this point, the change in pressure can “suck” air through the drain hole, creating a gurgling effect. This is especially typical for models where the drainage tube has a complex trajectory.
It is also worth considering the work fan in the No Frost chamber. When the door is closed, the sensor can give a command to change the rotation speed or stop, which, in combination with the circulation of freon, creates a complex acoustic background. The system Multi Air Flow also makes its contribution by moving large volumes of air through special channels.
How to distinguish the sound of defrosting from a breakdown?
The sound of defrosting is usually accompanied by clicks (operation of the heating element or valve) and lasts a certain time. A breakdown is often characterized by a constant, monotonous noise that does not depend on the operating cycles of the compressor.
Drainage system: when sound becomes a problem
Although gurgling is often normal, there are situations when it indicates a blockage. If drain hole clogged with food debris or ice, the water has nowhere to drain. When the door is closed, the air pushes out the accumulated liquid, and it begins to bubble, trying to overcome the obstacle.
Check the condition of the drain channel on the back wall of the refrigerator compartment. If you notice water or ice there, this may be the reason for the increased sounds. In such cases, you need cleaning the drainage a soft wire or a special brush to restore the free flow of water.
Improper tilt of the refrigerator also affects the operation of the drainage. If the equipment is piled back, the water will not drain away by gravity, but will stagnate and gurgle every time the door is opened and closed. Make sure that the legs are adjusted so that the body has a slight tilt back.
☑️ Diagnostics of the drainage system
The influence of temperature and operating mode
Temperature directly affects the intensity of sounds. If you set minimum temperature (for example, +2°C), the compressor runs almost non-stop. In this mode, freon circulates constantly, and the probability of hearing gurgling when the door is closed is maximum.
When loading a large amount of warm products, the system switches to the intensive coolingmode. The pressure in the system increases sharply, the speed of movement of the refrigerant increases, which makes the sounds louder and more frequent. This is a temporary phenomenon that goes away after reaching the operating mode.
The seasonal factor also plays a role. In summer, when the ambient temperature is high, it is difficult, and the system works under increased load. In winter, on the contrary, the sounds may be quieter, but noise may appear due to the difference in temperature when the door is opened frequently. heat exchange difficult, and the system operates under increased load. In winter, on the contrary, the sounds may be quieter, but noise may arise due to the temperature difference when the door is opened frequently.
Table: Normal sounds vs Signs of malfunction
To make it easier for you to navigate, we have compiled comparison table. It will help distinguish normal noises from the signals for help that your equipment gives.
| Sound character | Probable cause | Status |
|---|---|---|
| Quiet water transfusion | Circulation freon in the evaporator | Normal |
| Loud bubbling after closing | Change in pressure in the circuit | Normal |
| Gurgling with hissing | Refrigerant leakage through microcracks | Repair required |
| Constant gurgling without cooling | Clogged capillary system or compressor breakdown | Required diagnostics |
| The sound of pouring water in the pan | Overflow or clogged drainage | Cleaning required |
Pay attention to the combination of sounds with the temperature in the chambers. If the refrigerator gurgles, but the food freezes or, on the contrary, spoils, this is a sure sign thermostat malfunction or a freon leak, even if the sound itself seems normal.
Mechanical reasons and tightness
Sometimes the reason lies not in the internal system, but in a violation of the tightness of the circuit. If sealing rubber the door is worn out or does not fit tightly, a sharp bang occurs when closing, followed by a whistle or gurgle of air passing through the gap.
Check the condition of the seal around the entire perimeter. A test with a sheet of paper will help identify problem areas: hold the sheet of paper in the door and try to pull it out. If it comes out too easily, the seal is broken. In this case, the “gurgling” is the sound of passing air, not freon.
It is also worth checking fastening the compressor. If the shock absorbers are worn out, the vibration of the motor is transmitted to the body and tubes, causing them to resonate and create additional sounds when any impact is applied to the door. Tightening the fastenings or replacing the shock absorbers will solve this problem.
⚠️ Attention: If you smell chemicals or see oily stains under the refrigerator, immediately unplug the appliance. These are signs of a freon leak, which can be flammable or toxic depending on the brand.
⚠️ Attention: Do not try to seal the pipes yourself or add freon without special equipment. This can lead to complete failure of the compressor and loss of warranty.
⚠️ Attention: Technical characteristics and location of elements may vary depending on the specific model and year of manufacture. Always check the official manufacturer's instructions for your modification.
FAQ: Frequently Asked Questions
Why does the refrigerator gurgle only when I close the door?
This is due to a sudden change in pressure inside the sealed chamber. The slamming of a door creates an air wave that affects the flexible elements of the system and accelerates the movement of the refrigerant, making circulation sounds more audible.
Is loud gurgling dangerous for new equipment?
No, this is absolutely normal for new equipment. Newer models use more efficient, but sometimes noisier, refrigerants, and the tubes may be positioned closer to the walls, increasing resonance. Over time, the sounds may become quieter.
Can an empty refrigerator gurgle?
Yes, it can. The presence or absence of products affects the heat capacity of the chamber, but not the physical process of freon circulation. An empty refrigerator may even sound louder, since the food has nothing to dampen the vibration of the shelves and the body itself.
What to do if the gurgling does not stop around the clock?
If the sound does not subside for a long time and is accompanied by poor cooling, this may indicate a clogged capillary system or a valve malfunction. In this case, it is recommended to call a specialist to measure the pressure in the system.
Does the brand of the refrigerator affect the noise level?
Yes, the designs of different brands (Indesit, Atlant, Liebherr) differ. For example, in two-compressor models, sounds can be heard more often, since on/off cycles occur independently for each chamber.