Many owners of household appliances are faced with a situation when their refrigeration equipment starts to make strange sounds reminiscent of the flow of liquid. This noise is most often described as gurgling, gurgling, or splashing. A natural question arises: is this a sign of a breakdown or normal operation of the system? In most cases, such acoustic effects are absolutely normal and are due to the physics of the refrigerant.
However, there are situations when murmur of freon it becomes too loud or is accompanied by other alarming symptoms. Understanding the nature of these sounds will help you avoid panic and unnecessary costs of calling a technician. In this article we will analyze in detail all the possible causes of noise in the tubes and evaporator.
We will consider not only standard operating processes, but also technical malfunctions that require specialist intervention. It is important to be able to distinguish natural flow refrigerant from problems with the condensate drainage system or gas leaks. Let's dive into the structure of the refrigeration unit to understand the source of the sounds.
⚠️ Attention: If the sound of pouring water is accompanied by a complete lack of cold or icing of the back wall, this may indicate a critical decrease in freon levels. Don't ignore the combination of noise and loss of performance.
Physics of the process: how the refrigerant moves
The main reason why the refrigerator makes sounds similar to running water lies in the circulation refrigerant within a closed loop. Modern models use freon, which constantly changes its state of aggregation. It passes from liquid to gaseous state and back, taking heat from the chambers and releasing it to the environment through the condenser.
This process is continuous and cyclical. When a compressor compresses gas, it heats up and moves through the condenser tubes, where it cools and turns into a liquid. It is the movement of this liquid, as well as residual gas through thin capillary tubes, that creates the characteristic gurgling sound. The intensity of the sound depends on the design of the system and the type of refrigerant used refrigerant.
The sound wave is transmitted through metal tubes, which, in turn, are fixed to the housing or internal lining. If the fastening is loose or the metal vibrates in resonance with the fluid flow, the sound may increase. In new models with inverter compressors this process occurs more smoothly, but the sound of flow is still present.
The intensity of the sounds may vary depending on the stage of the cycle. When the engine starts or immediately after it stops, the pressure in the system equalizes, which is often accompanied by a louder gurgling sound. This is due to the fact that liquid freon actively flows from a high-pressure zone to a low-pressure zone through a capillary tube.
No Frost system: operating features and sounds
In refrigerators equipped with the system No Frost (or Full No Frost), the acoustic background may be richer than in models with a drip defrosting system. Here, the sound of flowing water is often combined with the noise of a fan and the occasional crash. However, the murmur in this case is most often associated with the removal of melt water.
During the automatic defrosting process, the evaporator hidden behind the rear panel becomes covered with frost. The TEN (heating element) turns on and the ice melts. The resulting water flows into a special drainage tray located under the evaporator, and from there it goes through a tube into a container above the compressor. This flow of water creates a sound very similar to pouring liquid.
- 💧 Draining water: during the defrost cycle, water actively flows through the drainage channel, creating gurgling sounds.
- 🌬️ Fan operation: sometimes air noise can be confused with the noise of liquid, especially if the air duct is clogged.
- ❄️ Cyclicity: the sound appears strictly periodically, usually once every 8-12 hours, when the defrosting timer is triggered.
If your refrigerator belongs to the class Low Frost or has a combined cooling system, the nature of the sounds may change. In such devices, water can drip onto the evaporator fins, creating a rhythmic clicking or splashing sound. It is important to monitor the regularity of these sounds.
It is worth noting that in models with a freshness zone or zero chamber, additional evaporators can be used. The circulation of refrigerant in these independent circuits also produces leaking sounds. If you have a two-compressor unit, then when one of them is operating, the sounds in the second circuit may be more audible due to the pressure difference.
Is this normal: when should you worry
As already mentioned, in 90% of cases the sound of flowing water is normal phenomenon. Manufacturers of household appliances even indicate in the instructions that gurgling and gurgling are a characteristic feature of the operation of the refrigerator. However, there are “red flags”, ignoring which can lead to serious damage.
The alarm should be sounded if the nature of the sound has changed dramatically. For example, if a quiet murmur is replaced by a loud gurgling sound, similar to boiling water in a kettle, this may indicate o freon leak. When there is less gas in the system, the pressure drops, and the compressor has to work harder, pumping a mixture of gas and oil with a characteristic sound.
⚠️ Attention: Loud gurgling, which does not stop even after the compressor has been idle for a long time, often indicates that there is little refrigerant left in the system, and it boils at low pressure.
Another important aspect is the accompanying symptoms. If there is a sound of water, but the refrigerator has stopped freezing, or condensation has appeared on the food, it means circulation is impaired. Also pay attention to the temperature of the case. If the side walls or rear grille remain cold when the engine is running, and the sound of flow is very active, it may have formed clogging in the capillary tube.
Let's compare normal and abnormal signs in the table below to make it easier for you to carry out initial diagnostics:
| Parameter | Normal operation | Symptoms of malfunction |
|---|---|---|
| Volume | Quiet murmur, heard nearby | Loud gurgling, heard in the next room |
| Temperature | Foods are cooled evenly | The chambers are warm, food spoils |
| Mode work | The sound appears cyclically | The sound is constant or chaotic |
| Condensation | Absent or minimal | Puddles inside or outside, frost |
It is also worth considering the age of the equipment. In older refrigerators, the noise may increase due to wear of the rubber shock absorbers on which it is mounted. compressorVibration is transmitted to the tubes, amplifying the sound of liquid flow. In new models, especially in the budget segment, thin chamber walls can act as resonators.
Problems with the drainage system
If the sound resembles not just a quiet murmur, but rather the noise of a flowing stream or even squelching, the problem may lie in the drainage system condensate In refrigerators with drip defrosting, water flows down a groove on the back wall into a drainage hole. If this path is clear, the water leaves silently or with a slight splash.
However, it often happens that the drainage hole becomes clogged with crumbs, mold or ice. The water stops draining quickly and begins to accumulate in the gutter. When the compressor turns off and the ice on the evaporator melts, a large volume of water suddenly breaks off and falls noisily into the tray, creating a “waterfall” effect inside the chamber.
How to clean the drainage hole?
For cleaning, use a special soft wire (brush) or a medical bulb with warm water. Carefully insert the tool into the hole on the back wall of the refrigerator compartment and make several forward movements. Then pour in some warm water to flush out the canal. Be careful not to pierce the channel wall with sharp objects.
In systems No Frost the drainage tube goes inside the housing to the tray above the motor. If it is frozen or clogged with dirt, water can drip directly onto the operating heating element or onto the hot parts of the compressor, producing a loud hissing and gurgling sound. This is not only noisy, but also dangerous, as it can lead to a short circuit.
- 🧹 Clogging: accumulation of dirt in the drainage channel.
- 🧊 Ice plug: freezing of water in the outlet of the tube.
- 💧 Improper slope: if the refrigerator is crooked, water may not fall into the hole, but flow down the wall.
To fix the problem, it is often enough to carry defrosting. Unplug the refrigerator for 10-12 hours, leaving the doors open. During this time, the ice in the drainage system will melt and the water will flow freely. If after switching on the sound repeats, mechanical cleaning of the channel will be required.
The influence of installation and location of equipment
Often the reason for the increase in sounds lies not in the internal filling, but in the way the unit itself is installed. If the refrigerator is not level, the angle of inclination necessary for the correct flow of oil in the compressor and refrigerant in the tubes is disrupted. This may cause additional gurgling.
Use a building level to check the horizontal level. The adjustment is carried out using the front support legs. The correct position is when the refrigerator body is slightly tilted back so that the doors close themselves under the influence of gravity. This ensures tightness and proper distribution of liquids in the system.
The gap between the back wall of the refrigerator and the wall of the room is also important. If the equipment is moved close, the pipes can touch the wall and transmit vibration, amplifying the sound. In addition, insufficient ventilation leads to overheating condenserwhich changes the nature of freon circulation.
Check that the tubes do not touch each other or the housing. When the compressor operates, vibration occurs, and if the copper tubes come into contact, they begin to rattle, and the sound of the liquid flowing inside resonates. Carefully (with the device turned off!) move the tubes away from each other by 1-2 cm.
Diagnostics and methods for eliminating noise
If you realize that the sound is not normal, or just want to make sure that the equipment is working properly, carry out consistent diagnostics. You don't need to be an engineer to perform an initial inspection. The main thing is to act carefully and follow safety precautions.
First, listen to where exactly the sound is coming from. Place your ear on the outside of the back wall (where the grille is), on the sides, or on the inside wall of the chamber. Localization of the sound will help you understand where exactly the process is happening: in the evaporator, in the condenser or in the motor area.
☑️ Algorithm for checking the refrigerator
If you find that the refrigerator is crooked, use the adjustable legs. By twisting or unscrewing them, achieve a stable position. Rock the body - it should not wobble. After this, let the equipment stand for 2-3 hours before turning it on, so that the oil in the compressor flows into the crankcase.
If simple methods do not help, and the sound continues to bother you, professional repairs may be required. This could be replacing the filter drier, refilling freon or cleaning the capillary system. It is prohibited and dangerous to climb into the freon circuit yourself without equipment and a license.
⚠️ Attention: Never try to disconnect the tubes yourself or drill the housing to access the evaporator. There is a gas in the system that, if in contact with fire (if you decide to solder), can ignite, and a sharp expansion of the gas is dangerous to health.
Frequently asked questions (FAQ)
Why does the refrigerator gurgle immediately after the compressor is turned off?
This is an absolutely normal physical process. When the motor stops pumping freon, the pressure in the system equalizes. The liquid refrigerant, which was under pressure, begins to actively flow into the low-pressure zone, creating the sound of overflowing liquid. This can last from a few seconds to a minute.
Is the sound of water dangerous for food in the refrigerator?
The sound itself is not dangerous. However, if it is caused by a freon leak or a blockage, then over time the temperature in the chambers will begin to rise. Therefore, if the sound changes and becomes louder, monitor the temperature of the food. If the meat has become soft and the milk has become sour, call a professional immediately.
Can the sound of water be a sign that the refrigerator is old?
Not necessarily. New refrigerators also make such sounds. However, in older models the sound insulation may be worn out or the fastenings may be loose, causing the normal operating sounds to become more audible. Also, in older units, blockages in the drainage system are more likely to occur.
What to do if the sound appeared after transporting the refrigerator?
If you transported the refrigerator lying down or tilted it strongly, the oil might take time to drain back into the compressor. It is recommended not to turn on the equipment for at least 4-6 hours (or better yet, 24 hours) after delivery. If the sound does not pass through after a day of operation, check whether the tubes were damaged during transportation.
Do you need to lubricate the tubes so that they make less noise?
No, lubricating the tubes from the outside is pointless, since the sound comes from the inside from the movement of gas and liquid. Lubrication can only temporarily remove squeaking in places where the tubes rub against each other, but will not eliminate gurgling. To reduce noise, it is better to use vibration-insulating materials or check the installation.