The situation when the refrigerator is murmuringis familiar to many owners of household appliances. This specific sound can range from a quiet pouring of liquid to a loud gurgling sound, reminiscent of a pump. For most modern models, especially those equipped with a system No Frost, such sounds are the absolute norm during certain operating cycles.
However, if the sound becomes intrusive or is accompanied by other signs of a malfunction, you should not ignore it. Understanding the physical processes occurring inside the unit will help you distinguish normal operation from a serious breakdown. In this article we will analyze in detail the mechanics of the occurrence of sounds and methods for eliminating them.
Physics of the process: why liquid flows inside the refrigerator
The main reason why the refrigerator humslies in the circulation of the refrigerant. This is a special substance (freon), which constantly moves along a closed circuit of tubes, changing its state of aggregation. In the evaporator, the refrigerant boils, turning into gas and absorbing heat, and in the condenser it cools down and becomes liquid again.
It is the process of transition from the liquid to the gaseous state and back that is accompanied by a characteristic sound. When the compressor builds up pressure, the refrigerant is forced through the narrow capillary tubes with force. If a little liquid phase remains in the system, it creates an overflow effect, which we hear as gurgling. In modern models with inverter compressors, this process may be more noticeable due to a smooth change in power.
It is important to understand that the sound of freon circulation is a sign that refrigeration system it is sealed and working correctly. A complete absence of sounds could indicate a blockage in the system or a lack of refrigerant. Therefore, if you hear a slight murmur, but the food is cooling normally, most likely the equipment is working properly.
No Frost system: Features of defrost operation
In refrigerators with a system No Frost the causes of noise may be more varied. Here, in addition to freon circulation, the condensate drainage system is actively working. It turns on periodically Defrost heating element, which melts the ice formed on the evaporator. Melt water flows through special gutters into the drainage system.
The process of water flowing into the drainage container is often accompanied by sounds similar to a stream or a dripping faucet. This is completely normal, especially at the end of the defrost cycle. Water passes through narrow holes and bends in the tubes, creating an acoustic effect. If the refrigerator is noisy it is at the moment when the compressor can be turned off, this is almost certainly the work of the water drainage system.
Sometimes water can linger in the tray above the compressor, where it evaporates naturally. At this point, a slight hissing or gurgling sound is also possible. The design of such models assumes that the user will hear the operation of fans and the movement of air flows, which in total creates background noise.
Why is No Frost noisier?
Refrigerators with the No Frost system have more mechanisms installed (fans, heating elements, valves) than in drip models, so their background sound level is initially higher.
It is worth paying attention to the nature of the sound. If it's an even pour, there's nothing to worry about. But if the sound resembles the bursting of bubbles or sharp water hammer, this may indicate an imbalance of the refrigerant or problems with ventilation.
Diagnostics: normal or sign of malfunction
How to distinguish the normal operation of equipment from an incipient breakdown? The first step is to carefully observe the nature of the sound and accompanying symptoms. If the refrigerator is whirringbut the temperature inside the chambers remains stable, and there is no excess ice on the walls, most likely the equipment is healthy.
However, there are alarming signs that require the intervention of a technician. If humming, knocking or vibration is added to the murmur, which is transmitted to the body, this may indicate a malfunction compressor or a violation of the fastening of internal elements. You should also be wary if the sound appears suddenly after a long period of silence.
Pay attention to the frequency of the noise. A cyclic character is considered normal: the compressor turned on - the sound of circulation began, turned off - it became quieter. A constant, incessant gurgling sound may indicate that air or moisture has entered the system, which requires evacuation and refilling.
External factors: the influence of installation on the noise level
Often the reason that the refrigerator makes soundsis not an internal fault, but an incorrect installation. Vibration from the compressor is transmitted to the housing, and then to the floor and walls, enhancing the resonance effect. If the equipment is not level, vibration can cause the tubes to rattle against the internal walls or structural elements.
Check whether the unit is positioned strictly horizontally. To do this, use a building level or simply shake the refrigerator. The legs should be twisted so that the equipment rests on them, and does not stand tightly on the back wall. The gap between the back wall and the furniture also plays a role: a too tight fit increases the noise.
Another important point is contact with other objects. Tubes hanging from behind should not touch each other or the wall. Sometimes it is enough to simply move them apart with your hands (with the appliance unplugged!) to eliminate extraneous ringing or rattling, which can be confused with internal murmur.
☑️ Checking the installation of the refrigerator
Table of the main causes of noise and elimination methods
For ease of diagnosis, we have systematized the main causes of sounds in a summary table. This will help you quickly navigate the situation and make the right decision about the need to call a specialist.
| Sound type | Probable cause | Normal or breakdown | Actions |
|---|---|---|---|
| Quiet gurgling, transfusion | Freon circulation | Normal | Do nothing |
| Sound of flowing water | Draining condensate (No Frost) | Normal | Check drainage |
| Loud bubbling, gurgling | Lack of freon or air in the system | Failure | Call a technician |
| Burring + knocking | Vibration of tubes on the body | Removable | Adjust the tubes |
| Constant hum and noise | Compressor wear | Failure | Compressor repair |
Using this table, you can initially assess the condition of your unit. Remember that refrigerator diagnostics requires care. If you are not confident in your abilities, it is better to play it safe and contact a specialist, since independent intervention in the refrigerant circulation system is prohibited.
When professional repairs are required
There are a number of situations when independent actions are not only useless, but also dangerous. If murmuring accompanied by an increase in temperature in the chambers, the appearance of a “crying” crust of ice or a complete absence of cold, the problem lies in a freon leak or a clogged capillary system.
A refrigerant leak is a serious malfunction. Freon not only provides cooling, but also lubricates the compressor. Operating the unit with low refrigerant levels can lead to overheating and motor failure, which will require expensive replacement. Therefore, if you notice signs of a leak, immediately turn off the device.
⚠️ Attention: Attempts to solder the tubes yourself or add freon without special equipment and a license are strictly prohibited. This can lead to an explosion of the system or poisoning.
Professional help is also needed if the sound changes after a power surge or shock during transportation. In such cases, the valve could be damaged or a microcrack could form in the circuit. The technician will carry out defection using a leak detector and pressure gauges, which cannot be done at home.
Prevention and proper care of equipment
In order for your refrigerator to work quietly and for a long time, it is important to follow the operating rules. Regular defrosting (for drip systems) prevents the formation of a thick ice crust, which can impede heat transfer and create noise. Even in No Frost systems, it is recommended to completely turn off the device once a year for hygienic cleaning.
Keep the condenser grille at the back clean. Dust and animal hair, accumulating there, impair heat transfer. The compressor has to work longer and harder to maintain the set temperature, which increases the load on the system and the noise level. You need to vacuum the grill carefully so as not to bend the thin slats.
Do not overload the refrigerator with food. Packing that is too dense interferes with air circulation inside the chambers, which can lead to uneven cooling and more frequent compressor activation. Leave space between products and walls for free circulation of air flow.
The effect of products on noise
Heavy objects on door shelves can loosen the fasteners, causing rattling when closing, which is often confused with internal noise of the unit.
Frequently asked questions (FAQ)
Why does a new refrigerator gurgle loudly?
New models often have more powerful compressors and efficient but noisy circulation systems. In addition, in the first weeks of work, grinding in of parts occurs. If the temperature is normal, this is not a defect.
Can whirring sound mean that the refrigerator is defrosting?
Yes, in No Frost systems, the sound of flowing water often indicates a defrost cycle. If an old refrigerator with ice is defrosting, the sound may be associated with melting ice dripping into the pan.
Is it dangerous if the refrigerator gurgles and does not freeze?
This is a dangerous symptom. The combination of noise and lack of cold indicates a freon leak or a serious blockage. You cannot operate such a device - the compressor will burn out.
How to reduce the noise of an old refrigerator?
Check the alignment of the legs, move the equipment away from the wall, make sure that it does not touch other objects. You can place anti-vibration rubber pads under the legs.
⚠️ Attention: Technical characteristics and design features of refrigerators may vary depending on the manufacturer and year of manufacture. Always check the instructions for your specific model for accurate information about permissible noise levels.