Many owners of household appliances are faced with a situation where something in the refrigerator is overflowing, gurgling or making strange sounds. For most users, these acoustic effects become a cause for serious concern, since few people know the physics of the work refrigeration circuit. In fact, many sounds are an absolutely normal sign of the operation of the unit, especially when it comes to modern models.
However, technical malfunctions should not be discounted. The nature of the sound, its frequency and location of occurrence may indicate that condensate drainage system the refrigerant is clogged or is not circulating properly. Understanding the difference between normal operation and breakdown will help you avoid unnecessary costs of calling a technician or, conversely, prevent damage to products due to ignoring the problem.
In this article we will look in detail at why noise occurs, how to diagnose the source of the sound and in which cases immediate intervention is required. It is important to listen carefully to your unit in order to understand the nature of what is happening.
Physics of the process: why a working refrigerator hums and seethes
The main reason why liquid overflows in the refrigerator lies in the principle of operation refrigerant. Freon circulating through the tube system constantly changes its state of aggregation. In the condenser it turns from gas into liquid, giving off heat, and in the evaporator it boils again, taking in cold. It is this transition process that causes the characteristic gurgling of the refrigerant
The sounds can be especially noticeable immediately after the compressor is turned off. At this moment, the pressure in the system is equalized, and the remaining liquid freon flows into the lower part of the circuit. If you hear something shimmering inside the walls of the case, this often means the normal completion of the cooling cycle.
Modern models equipped with inverter compressors operate quieter than their older counterparts, but the sounds of fluid movement in them are heard more clearly due to the absence of the constant hum of the motor. In the quiet of the kitchen, these sounds may seem louder than they actually are.
- 🔊 The sound of running water is usually heard in the first minutes after starting or stopping the motor.
- 💧 The gurgling sound may intensify if the refrigerator has recently been defrosted or loaded with warm food.
- ❄️ In models No Frost sounds may come from the evaporator defrost system.
- 🏠 Positioning the unit near a wall can create resonance, increasing the noise.
⚠️ Attention: If the sound of overflow is accompanied by a lack of cold or continuous operation of the compressor without shutdowns, this may indicate a leak freon or clogged capillary tube.
It is considered normal if the sounds occur cyclically and last a short time. Constant bubbling, which does not stop for hours, already requires a more detailed study of the state of the equipment.
No Frost system: features of the sound
In refrigerators with the system No Frost ("without frost"), the sound background is much richer than in static models. There is a fan that drives cold air around the chamber and an automatic defrosting system. The heating element is periodically turned on, which melts the ice on the evaporator, and the resulting water flows into the drain pan.
It is the process of water drainage and its evaporation in the hot zone of the compressor that is often perceived by users as extraneous sounds. When something overflows in the refrigerator, in the case of No Frost this often means the drainage system is working. Water drips into the pan, which is located above the motor, and evaporates intensely, creating hissing and gurgling.
It is also worth considering the operation of the fan. If ice has accumulated on its blades or bearings, the sound may change from a steady hum to an intermittent noise that sounds like fluid pouring or rubbing. This happens because the ice partially blocks the air flow.
It is important to distinguish between normal defrosting sounds and signs of malfunction. If the sounds do not stop or become louder after the defrost cycle, the system may need to be checked.
How can you distinguish the sound of a fan from the sound of water?
The sound of a fan is usually monotonous and depends on the rotation speed. The sound of water is chaotic, with different tones of gurgling and splashing, often dying down after a few minutes.
When noise indicates a malfunction: alarming symptoms
Despite the fact that many sounds are natural, there are situations when gurgling becomes a harbinger of a breakdown. If something in the refrigerator is pouring too loudly, similar to the sound of syrup or sand pouring from a bottle, this may indicate a change in the composition of the refrigerant or the presence of air in the system.
One of the serious problems is clogged capillary pipeline. In this case, freon cannot circulate freely, and its movement is accompanied by a whistle or a sharp hiss that turns into gurgling. In this case, the refrigerator can work non-stop, trying to gain temperature, but not coping with the task.
Another option is failure of the compressor. If the internal valves are worn, gas may pass through them with a characteristic sound even when the pistons are not working at full power. This is often accompanied by vibration of the case.
Pay attention to the following signs:
- 📉 The food in the chamber has stopped freezing or is cooling worse than usual.
- 🔥 The side walls of the refrigerator remain cold, although the motor is hot.
- 🔊 The sound of overflowing does not stop even after a long period of inactivity of the equipment.
- 💨 Warm air may blow from the freezer when the compressor is running.
If you observe a combination of sounds and loss of cooling capacity, it is not recommended to continue operating the equipment.
Problems with the drainage system: when water does not flow there
Often the reason that something overflows in the refrigerator is trivial - it is water in the drainage tray or a clogged drain hole. During operation, condensation forms on the walls of the chamber, which must escape through a special hole in the back of the refrigerator.
If this hole becomes clogged with crumbs, ice or mold, the water has nowhere to go, and it begins to accumulate inside the chamber or under vegetable drawers. When the door is opened or the compressor vibrates, this water splashes, creating pouring sounds. In addition, excess moisture may fall onto the floor.
To clean the drainage, you can use a special brush, which is often included, or soft wire. It is also effective to rinse the hole with warm water using a syringe or bulb. The main thing is not to damage the plastic walls of the channel.
☑️ Checking the drainage system
After cleaning, you need to check whether the water leaves. To do this, you can pour a small amount of water (about 50 ml) directly into the drain hole. If the water drains quickly and without any residue, the problem is solved.
Diagnostic table: identify the problem by sound
To make it easier for you to navigate the nature of the malfunction, we have compiled a summary table. It will help to compare audible sounds with possible causes.
| Sound type | Probable cause | Need for repair |
|---|---|---|
| Quiet gurgling after stopping the engine | Movement freon through the tubes | Not required (Normal) |
| Water splash when opening the door | Drain hole clogged | Cleaning required |
| Loud overflow + no cold | Freon leak or system blockage | Urgent call for a technician |
| Hissing and whistling | Faulty compressor or throttle | Master diagnostics |
| Burring in defrost mode | Draining of melt water into the pan | Not required (Normal) |
Use this table as a primary diagnostic tool. However, remember that an accurate diagnosis can only be made by a specialist with equipment to check the pressure in the system.
The impact of improper installation on acoustics
Sometimes the reason that something overflows or hums in the refrigerator lies not in the equipment itself, but in the conditions of its installation. Incorrect placement can increase vibrations transmitted to the floor and walls, creating resonance.
Check that the unit is level. If the feet are not adjusted, the housing may become warped, causing improper oil flow through the compressor and a change in the sound of the compressor. It is also important to leave gaps between the back wall of the refrigerator and the wall of the room for free air circulation.
In addition, if the refrigerator is on a slippery floor (tiles, linoleum), vibration of the motor can cause it to move slightly, which causes rattling and noise of overflowing liquid in the pan.
- 📏 Check the horizontal installation with using a building level.
- 🔧 Adjust the height of the front legs so that the door closes itself.
- 🚫 Make sure that the refrigerator does not touch furniture or walls.
- 🧹 Check for any foreign objects under the unit that cause vibration.
⚠️ Attention: Do not install the refrigerator in close proximity to heating appliances or in direct sunlight. Overheating of the compressor causes it to work harder and noisier.
Correct installation is the key to not only quiet operation, but also the durability of the compressor. Make sure that the equipment is stable and nothing interferes with its operation.
What to do if the sounds do not stop
If you have checked all external factors, cleaned the drainage, made sure that the installation was correct, and there is still something overflowing in the refrigerator and disturbing your life, it’s time to think about calling a specialist. Independent repair of the cooling system requires special skills and tools.
The technician will conduct diagnostics using a pressure gauge, check the freon pressure, the integrity of the circuit and the operation of the electronics. In some cases, it may be necessary to replace the compressor, purging the system or charging with refrigerant.
Do not try to open a sealed circuit yourself or change the compressor without experience. This can lead to the final failure of the equipment and is potentially hazardous to health due to the properties of refrigerants.
Keep an eye on your equipment, listen to its “feeling”, and it will serve you for many years without serious problems breakdowns.
Why does the refrigerator gurgle only at night?
At night, the overall noise level in the apartment decreases, and the sounds of operating equipment become more noticeable. In addition, the network voltage often changes at night, which can affect the operation of the compressor, making its start and stop more abrupt.
Can a new refrigerator gurgle?
Yes, a new refrigerator can make sounds during the “break-in” period. The compressor and pipe system operate in a new mode, the oil is distributed throughout the system. Usually, after 1-2 weeks of operation, the sounds become quieter or more familiar to the ear.
Is it dangerous if water overflows in the refrigerator?
The sound itself is not dangerous. The only danger is when water flows out and gets on electrical components or creates a risk of short circuit, as well as the risk of food spoilage due to breakdown.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not need to be completely defrosted, it is enough to wipe the chamber when dirty. However, once a year it is recommended to turn off the refrigerator for a day to completely defrost the hidden elements and wash the drainage system.