The situation when the refrigerator begins to make sounds reminiscent of boiling or gurgling water often takes owners by surprise. Many perceive this as a signal of a serious breakdown, threatening food spoilage and costly repairs. However, in most cases, such acoustic phenomena are normal operation refrigerant circuit and do not pose a threat to the unit.
Nevertheless, a sharp change in the sound background cannot be ignored. If a previously quiet device suddenly began to “bubble” with varying intensity, this may indicate either a banal violation of operating rules or the initial stages of a freon leak. Understanding the physics of the processes occurring inside the system will help you accurately determine whether you need urgent help from a specialist or whether the problem can be solved on your own. thermostat malfunctions or freon leak. Understanding the physics of the processes occurring inside the system will help you accurately determine whether you need urgent help from a specialist or whether the problem can be solved yourself.
In this article we will analyze in detail the mechanism of noise, consider the possible reasons for their appearance in various models of household appliances and provide a step-by-step algorithm of actions. You will learn how to distinguish a normal operating condition from a critical breakdown, and what preventive measures will extend the life of your refrigeration equipment.
Physics of the process: why does a refrigerator make sounds
To understand the nature of sounds, you need to turn to the principle of operation of the refrigeration unit. Freon circulates inside a closed loop, which constantly changes its state of aggregation. In the condenser, usually located on the rear wall, gaseous freon under high pressure cools and turns into liquid. It is this process of transition from gas to liquid that is often accompanied by a characteristic hissing or gurgling. refrigerant (freon), which constantly changes its state of aggregation. In the condenser, usually located on the rear wall, gaseous freon under high pressure cools and turns into liquid. It is this process of transition from gas to liquid that is often accompanied by a characteristic hissing or gurgling sound.
Next, the liquid refrigerant enters capillary tube and the evaporator, where the pressure drops sharply. Here, the liquid boils at low temperatures, which is accompanied by the absorption of heat from the refrigerator chambers. The sounds that the user hears are the result of the movement of a mixture of liquid and gas through the tubes. Modern models with the system No Frost add the noise of fans and the sound of dripping during defrosting, which can also be mistaken for boiling.
⚠️ Attention: If the sound of “boiling” is accompanied by a complete absence of cold in the chambers, this is a sure sign that the system depressurized and the freon has completely escaped. In this case, operating the device is useless and requires calling a specialist.
It is important to take into account the design of the device itself. In models with one compressor and two evaporators (the so-called “crying refrigerator” system in the main chamber and No Frost in the freezer), circulation sounds may be more pronounced due to the distribution of refrigerant flows. In addition, the housing material and the quality vibration insulation of the compressor directly affect how loud the internal processes will be heard outside.
Normal operation of the cooling system
In the vast majority of cases, sounds reminiscent of liquid pouring or slight boiling are a sign of proper operation refrigerator operation. This is especially true for appliances that have just been plugged in after defrosting or transporting. At this moment, the system is actively filled with refrigerant, and its circulation is most intense.
The sound background may vary depending on the current load on the unit. For example, if you just put a large pot of hot soup into the chamber or loaded a lot of food at room temperature, compressor it will work at high speeds, pumping large volumes of freon. At such moments, the gurgling may intensify and become more loud.
It is also worth noting the operation of the defrost system in No Frost models. Periodically, usually once every 8–12 hours, the defrosting heating element is turned on, which melts the ice on the evaporator. Melting water flows into a drainage tray located above the compressor. Dripping onto the hot surface of the motor, the water hisses and gurgles, which often frightens inexperienced users, although this is a normal process. A defrost heating element that melts ice on the evaporator. Melting water flows into a drainage tray located above the compressor. Dripping onto the hot surface of the motor, the water hisses and gurgles, which often frightens inexperienced users, although this is a normal process.
The intensity of the sounds also depends on the ambient temperature. In the summer, when the room is hot, it is more difficult for the refrigerator to give off heat, and it works longer and more intensely. During such periods, the sounds of refrigerant circulation can be heard almost constantly, while in winter, when the air in the kitchen is cool, the appliance may turn on rarely and operate quietly.
Errors during installation and operation
Often the cause of excessive noise and the “boiling” effect is not technical malfunctions, but trivial errors when installing the appliance. If the refrigerator is not level, vibrations from the operating compressor are transmitted to the body and amplified, creating resonance. This may be disguised as the sound of bubbling inside the system.
Another common reason is insufficient clearance between the back wall of the refrigerator and the wall of the room. For efficient operation condenser a free flow of air is required. If the radiator is pressed against the wall or covered by furniture, heat transfer deteriorates, pressure in the system increases, and the refrigerant begins to circulate with greater speed and noise, trying to compensate for overheating.
Improper defrosting can also lead to problems. If the user uses a hairdryer to defrost the unit, or, even worse, picks out the ice with a knife, the evaporator can be damaged. Microcracks lead to changes in pressure and the appearance of extraneous sounds. In addition, moisture entering the electrical circuits during active defrosting can cause a short circuit. evaporator. Microcracks lead to changes in pressure and the appearance of extraneous sounds. In addition, moisture entering electrical circuits during active defrosting can cause a short circuit.
⚠️ Attention: Never use sharp objects to chip ice and do not pour hot water on the shelves to speed up defrosting. This can cause permanent damage to the cooling circuit.
Checking the installation only takes a few minutes, but can eliminate false diagnoses. Make sure that the legs of the refrigerator are adjusted so that the body does not wobble and the door closes tightly and independently. Any distortion leads to disruption of the mechanisms and the appearance of vibrations.
Technical faults and their symptoms
If external factors and features of normal operation are excluded, it is worth considering possible breakdowns. One of the common reasons for changing the sound profile is failure thermostat. If the temperature sensor does not work correctly, the compressor may not turn off on time or, conversely, work in too short cycles, which causes constant circulation of freon and corresponding noise.
A more serious problem is a clogged capillary tube. An ice or technical blockage may form in the cooling system, which prevents the free flow of refrigerant. In this case, the compressor tries to force gas through a narrow opening, creating high pressure. The sound changes from a uniform hum to an intermittent, loud gurgle or even a whistle.
Freon leakage is another critical malfunction. When the amount of refrigerant in the system decreases, the compressor begins to circulate a mixture of gas and oil, which sounds like a loud “squelching” or “pouring.” In this case, the refrigerator stops freezing, and the motor-compressor works almost non-stop, trying to reach the set temperature.
What is the danger of a clogged capillary tube?
If the blockage is not removed in time, the compressor will work with overload, which will lead to its thermal breakdown and costly replacement of the motor. In addition, acid may form in the system, corroding the tubes from the inside.
Diagnosis of these problems requires special equipment. The technician needs to connect a pressure gauge station to check the pressure in the circuit, and use a leak detector to look for leaks. It is almost impossible to independently determine the exact cause of a technical malfunction without instruments.
Diagnostics: table of symptoms and causes
To simplify the initial diagnosis, we suggest that you familiarize yourself with the table, which systematizes the main symptoms and their probable causes. This will help you get your bearings before deciding to call a specialist.
| Symptom | Probable cause | Need for repair |
|---|---|---|
| Quiet gurgling, there is cold | Normal circulation of freon | Not required |
| Loud boiling + no cold | Refrigerant leak | Urgent |
| The noise increases when the door is opened | Inflow of warm air, fan operation | Not required |
| Intermittent gurgling, compressor hot | Clogged capillary system | Required |
| The sound of pouring water every 10 hours | Automatic defrosting system (No Frost) | Not required |
Pay attention to the combination of symptoms. sound without loss of cooling capacity rarely indicates serious failure. However, if the noise is added to the freezing of the “coat” in the chamber, the formation of condensation on the outer walls or the failure of one of the cooling zones, you cannot hesitate.
It is also important to listen to the operation of the compressor. If it hums smoothly, but “boils” inside, that’s one thing. If the motor itself makes sounds of knocks, grinding, or sharply changes tone, this is a sign of mechanical wear or problems with the electrical part.
Algorithm of actions when noise occurs
If you hear suspicious sounds, do not panic. Perform consistent testing to rule out simple causes. First, make sure that the refrigerator is level and not touching any walls or furniture. Check that the doors are tightly closed and that the shelves are not overloaded, which could cause the dishes inside to vibrate.
Next, analyze when exactly the sound appeared. If this happened immediately after loading the products or turning on the “Super Freeze” mode, then, most likely, after a few hours the operation will return to normal. If the noise occurs suddenly and is accompanied by loss of cold, proceed to more serious measures.
☑️ Primary diagnosis of noise
Try to unplug the refrigerator for 15-20 minutes and then turn it on again. Sometimes this allows the system to reset the error or redistribute the oil in the compressor. If, after restarting, the sound has not changed or the problem has worsened, professional diagnostics are necessary.
⚠️ Attention: Do not attempt to open the cooling circuit or seal the tubes yourself without the appropriate experience and equipment. This can lead to complete failure of the unit and is dangerous to health.
Record the nature of the sound on a voice recorder. This will help the technician to pre-assess the situation over the phone and take the necessary spare parts with him. The description “hums like a tractor” is less informative than an accurate recording of the sound of the engine.
Prevention and care rules
In order for your refrigerator to operate quietly and for a long time, it is important to follow the operating rules. Defrost regularly, at least once every six months (if the model is not No Frost) and wash the internal surfaces. Keeping the drainage hole in the back wall of the chamber clean is the key to the absence of excess moisture and mold, which can also affect acoustics.
Monitor the condition of the rubber seals on the doors. If they dry out or become dirty, warm air enters the chamber, forcing the compressor to work harder. Wipe the seals with a soft cloth and soapy water and check their fit with a sheet of paper.
Do not place the refrigerator next to heat sources: battery, stove or direct sunlight. Increased ambient temperatures force the cooling system to work at its limit, which inevitably leads to increased noise and energy consumption.
Timely maintenance and careful attention to the “behavior” of your refrigerator will help you avoid costly repairs. Remember that any new, previously unheard sound is a signal that the device gives to the owner, and you should not ignore it.
Why does the refrigerator boil only at night?
At night the house is usually quieter, and extraneous noises do not mask the operation of the equipment. In addition, the mains voltage often drops at night, which can affect the operation of the compressor, making its hum lower and more noticeable. Also, at night, the fans of the No Frost system are quieter.
Is it dangerous if the refrigerator gurgles after defrosting?
No, this is normal. After defrosting, moisture remains in the drainage system and on the walls, which, when turned on for the first time, begins to actively evaporate or drain, creating sounds. Also, the oil could have been redistributed in the circuit, which would temporarily increase the circulation noise.
Can a new refrigerator boil?
Yes, new models, especially with inverter compressors, can make different sounds during the “break-in” period. Grinding in parts and stabilizing pressure in the system in the first weeks of operation may be accompanied by unusual acoustic effects.
What to do if the sound is similar to a boiling kettle?
If the sound is very loud and resembles boiling water in a kettle, this may indicate a serious disruption of freon circulation or a malfunction of the compressor. In this case, it is recommended to immediately turn off the device and call a technician.