The situation when extraneous sounds appear inside household appliances always causes concern among owners. This is especially true in cases where water seems to be bubbling or liquid is flowing in the refrigerator. This specific acoustic effect can be either a sign of normal operation of the system or a signal of incipient problems with the refrigerant circuit. Understanding the physics of the process will help you not to panic over trifles and react in time to real breakdowns.
Modern units, whether budget Indesit or premium Liebherrmake various sounds during the circulation of the refrigerant. Most often, gurgling is associated with the movement of freon through the evaporator and condenser tubes. However, it is important to distinguish between quiet, periodic transfusion and loud, obsessive gurgling that interferes with the peace in the apartment. In this article, we will analyze in detail the mechanics of the occurrence of such noise.
Before calling a technician, you need to conduct an initial diagnosis yourself. Often the reason lies in trivial things that can be easily fixed without a special tool. We will consider the main scenarios in which water noise occurs, and action algorithms for each case. Attentive attention to the sounds of a working device extends its service life.
Physics of the process: why freon flows
The main reason why liquid murmurs in the refrigerator lies in the principles of operation of the refrigeration cycle. The refrigerant circulates in a closed circuit, changing from liquid to gaseous and back. At the moment when liquid freon passes through the capillary tube and enters the evaporator, a sharp expansion and boiling of the substance occurs. It is this process that is accompanied by a characteristic sound reminiscent of water pouring or quiet gurgling.
The intensity of the sound directly depends on the type of refrigerant and the design of the system. In models using R600a (isobutane), the noise may be more pronounced due to the characteristics of the compressor and the high speed of gas movement. If the refrigerator has just been defrosted or turned on for the first time after purchase, the sound may be louder than usual as the system returns to operating mode. This is an absolutely normal phenomenon that does not require intervention.
However, you should be wary if the murmur becomes constant and does not stop even during periods of rest of the compressor. This may indicate an imbalance of pressure in the system or the presence of an air lock. In normal condition, the refrigerant cycle is clearly synchronized with the operation of the engine. If the sound has changed its tone or frequency, this is a reason for a deeper analysis of the state of the equipment.
- 🔊 Normal sound: quiet, periodic gurgling, audible only in silence.
- 🔊 Alarming symptom: loud transfusion, accompanied by vibration of the body.
- 🔊 Critical situation: hissing, whistling or the sound of a flowing stream under high pressure.
⚠️ Attention: If the gurgling is accompanied by a strong smell of chemicals or oil, immediately unplug the device. This may indicate depressurization of the circuit and leakage of refrigerant along with compressor oil.
It is important to understand that completely silent refrigerators do not exist. Even the most expensive models with inverter compressors make sounds when the heat removal system operates. The key factor here is constancy of the sound background. Sudden changes in the acoustic picture are always the first indicator of a malfunction.
Normal operating modes and their sound
Many users mistake normal operating sounds for signs of a breakdown. Modern systems No Frost and static cooling have different acoustic profiles. In units with a drip defrosting system, a murmur is often heard when the evaporator defrosts, when melt water flows into the drainage tray. This sound can be quite distinct, especially if the tray is made of thin plastic that resonates with droplets.
In refrigerators with a system No Frost the sound of flowing water can simulate the operation of a fan or the defrost cycle of a heating element. When the heating element melts the ice on the evaporator, the resulting water flows into the drain hole. If the drain is partially clogged or has a complex configuration, water may gurgle, creating the illusion of a problem. Checking the drainage system is the first thing to do when such symptoms appear.
It is also worth considering the operating mode of the compressor. When the set temperature is reached, the motor stops and the refrigerant continues to move by inertia, flowing from a high pressure zone to a low pressure zone. This process can last several minutes and is accompanied by a characteristic gurgling sound. If your refrigerator Atlant or Beko makes such sounds immediately after turning off the motor, this is a normal situation.
There is also the concept of “thermal expansion”. Metal tubes and plastic structural elements change their geometric dimensions when heated and cooled. This can lead to tension in the tubes and the appearance of sounds similar to liquid flowing inside the walls. This is especially true for new models, where the materials have not yet completely shrunk.
Problems with the drainage system
One of the most common reasons why water flows in the refrigerator and gurgling is heard is a clogged drainage hole. During operation, condensation forms inside the chamber, which must flow freely into a special container above the compressor. If a plug of dirt, mold, or food particles forms in the drain tube, water begins to accumulate and make sounds with each new liquid entering.
To diagnose this problem, you need to inspect the back wall of the refrigerator compartment. At the bottom, often hidden behind a decorative panel or plastic plug, there is a drainage hole. If you see water or ice there, it means the outflow is disrupted. In such cases, a loud slurping or gurgling sound is often heard, especially when the evaporator is defrosting.
Removing the blockage is a procedure available to any user. You will need soft wire, a brush or a special cable to clean the drainage. Carefully, without sudden movements, it is necessary to clean the channel by removing the plug. After this, it is recommended to rinse the hole with warm water to make sure that patency is restored.
⚠️ Attention: When cleaning the drainage, never use sharp metal objects (knives, knitting needles) that can pierce the plastic tube or damage the evaporator hidden behind the chamber wall.
If the sound persists after cleaning, the problem may lie deeper - freezing of the drainage channel inside the housing. This often happens if the door seal is broken or the refrigerator operates in conditions of high humidity. In such cases, it may be necessary to completely defrost the unit within 24 hours.
Malfunctions of the defrosting system and evaporator
A more serious cause of the humming may be malfunctions in the automatic defrosting system. If the heating element (heating element) is not working correctly or the defrost timer is stuck, the ice on the evaporator may melt unevenly. Large pieces of ice falling onto the heater or into the tray create a noise that users often describe as “water running.” In addition, if the defrost sensor is faulty, the water may not have time to evaporate and stagnate, causing gurgling.
In models with Full No Frost the condition of the water drainage gutters plays an important role. If they are warped or misaligned, water will flow past the drain hole, landing on hot parts of the compressor or directly on the floor inside the housing. This not only creates noise, but is also dangerous for the electrical part of the device. A visual inspection of the internal components (with the back panel of the freezer removed) will help identify such defects.
Another factor is the formation of a “snow coat” on the evaporator. If the refrigerator door does not fit tightly, moist air enters and instantly freezes. When defrosting is turned on, this mass of ice begins to actively melt, creating a powerful flow of water that does not have time to escape through the drainage. As a result, there is splashing and babbling inside the housing.
| Symptom | Probable cause | Action |
|---|---|---|
| Burring when the compressor is running | Freon circulation (normal) or airing | Observe, if it increases, call a technician |
| Gurgling after turning off the motor | Residual movement of the refrigerant | Norm, no intervention required |
| Sound of pouring water + puddle inside | Clogged drainage or displacement of the gutter | Clean the drainage, check the angle of inclination |
| Loud splashing + ice on rear wall | Malfunction of the defrost system | Check the heating element, timer and sensors |
The influence of improper installation and operation
Often the answer to the question “why is the refrigerator humming” lies not in the technology, but in its conditions installations. If the unit is not level, the geometry of the frames is disrupted and the refrigerant may circulate with increased noise levels. Moreover, the slope affects the operation of the drainage system: if the refrigerator is tilted backwards, the water may not flow away by gravity, but stagnate and gurgle. Adjusting the legs is a simple operation that solves many acoustic problems.
Another common mistake is installing the refrigerator close to the wall or in a niche without gaps. For normal operation, the condenser (black grille at the back) requires free air flow. If heat is not removed, the pressure in the system increases, the compressor operates overload, and the movement of freon becomes more turbulent and noisy. Compliance with the installation instructions is the key to quiet operation.
It is also worth mentioning vibration. If the refrigerator is on a slippery floor or touches furniture, vibration from the compressor is transmitted to the structure, amplifying any sounds, including gurgling. Check whether the tubes from behind are touching each other or the walls of the housing. Sometimes it is enough to move the device a little or place anti-vibration pads under the legs.
Improper loading of the cameras can also affect the sound background. If food is placed close to the back wall, it can block the flow of cold air, causing local hypothermia and the formation of ice, which will then melt noisily. Maintain the gaps between the products and the walls of the chamber.
When professional repairs are required
There are a number of signs indicating that you will not be able to cope on your own. If the murmur is accompanied by the fact that the refrigerator has stopped freezing or the temperature in the chambers is unstable, this is a direct signal of problems with the tightness of the circuit. A freon leak is a serious malfunction that requires finding the location of the damage, soldering and refilling the system with new refrigerant.
Replacing a compressor or capillary tube is a complex technical procedure. Attempts at self-repair in such cases often lead to the final failure of the unit. The master uses special equipment: a vacuum pump, a pressure gauge station and a refill dispenser. This is the only way to ensure the correct pressure and the absence of moisture in the system.
Also, the help of a specialist is needed if the capillary tube (“capillary”) is suspected of being clogged. This is a thin copper tube that becomes clogged with oil breakdown products or paraffin. Cleaning or replacing it requires disassembling the system, which is almost impossible to do at home. Symptoms of a blockage: the compressor runs constantly, hums, but there is no cold, and the sound of gas movement may change to hissing.
⚠️ Attention: The characteristics of refrigerants and repair requirements may change. Always check the official documentation of the manufacturer of your model before starting any work.
Prevention and care of equipment
In order for your Samsung, LG or any other refrigerator to be quiet, you need to properly care for it. Regular defrosting (even for No Frost systems it is recommended to do this once a year) helps to avoid the formation of ice jams. Cleaning the drainage hole should become a habit: it is enough to check its patency once every 3-4 months.
Monitor the condition of the door seals. Dirt and grease reduce the elasticity of the rubber, the door does not close tightly, and moist air gets inside. Wipe the seals with a soft cloth and soapy water and lubricate them with silicone to preserve their properties. This will prevent excessive ice formation and associated noise.
Do not overload the shelves and ensure that food does not block the ventilation holes inside the chambers. Proper air circulation is the key to uniform cooling and the absence of local freezing zones. Taking good care of your appliances will extend the life of the compressor and keep your kitchen quiet.
Frequently asked questions (FAQ)
Why does a new refrigerator make loud noises in the first days?
New units often operate in intensive temperature mode. The compressor operates at full capacity and the refrigerant circulates at high speed. In addition, the materials of the case have not yet “got used to it.” Usually, after 3-5 days of operation, the noise level decreases to the standard level.
Is it dangerous if the murmur sound has become louder than before?
A sharp change in the acoustic profile is always a signal. If the sound becomes loud, metallic, or accompanied by vibration, this may indicate wear on the compressor, loose tubing, or pressure problems in the system. It is recommended to carry out diagnostics.
Can an empty refrigerator hum?
Yes, it can. An empty refrigerator will rise to temperature faster, and the compressor's on/off cycles may be shorter but more intense. In addition, the absence of products (which act as sound absorbers) makes any operating sounds more audible.
What to do if water appears inside the refrigerator and gurgling is heard?
First of all, check the drainage hole on the back wall. Most likely it is clogged. Clean it, defrost the refrigerator for 12-24 hours. If the problem repeats, the tray may be displaced or there is a malfunction of the defrost system.