The situation when something is murmuring in the refrigerator is familiar to many owners of household appliances. This specific sound can range from a quiet gurgling sound to a distinct flow of liquid, reminiscent of running water pipes. For most users, the appearance of unfamiliar acoustic effects becomes a cause for concern, although this often indicates normal operation of the system. Understanding the physics of the processes occurring inside the refrigeration chamber will help to distinguish the norm from an incipient breakdown.
The operation of any compression unit is based on the circulation of the refrigerant, which, changing its state of aggregation, produces characteristic sounds. However, if the murmur becomes too loud, constant or is accompanied by other symptoms, it cannot be ignored. Diagnostics of the sound source is the first step to preserving products and extending the life of expensive equipment.
In this article we will analyze in detail the mechanics of noise, consider possible malfunctions and provide an algorithm of actions for independent analysis situations. It is important not to panic, but to consistently check all the components, since the reason may lie either in a banal misalignment of the case or in more serious technical problems.
Physics of the process: why the refrigerant makes sounds
The main reason why something is murmuring in the refrigerator lies in the properties of the working fluid - freon. Moving through the system of evaporator and condenser tubes, the refrigerant constantly changes its state from liquid to gaseous and back. It is this process of phase transition that is accompanied by sound effects that we hear as gurgling or pouring of water.
In a working unit refrigerant circulates under the pressure created by the compressor. When you open the door or load warm food, the thermostat commands the motor to start. At this moment, the pressure in the system changes sharply, and the liquid begins to actively boil in the evaporator, creating a characteristic noise. This is absolutely normal phenomenonconfirming that the cooling system is functioning.
The intensity of the sound depends on several factors: the type of refrigerant, the design of the pipelines and the power of the compressor. Modern models often use more environmentally friendly, but noisy gases, and also have thin-walled tubes that conduct sound better. If the refrigerator is new, the “grinding in” period can last up to two weeks, during which the sounds can be more pronounced.
It is worth noting that the sound often intensifies at night due to the general silence in the apartment. During the day, the operating unit may not be heard, but at night the gurgling sound becomes clear. If the temperature in the chambers is kept within the specified limits, and the compressor operates cyclically (turns on and off), then there is no reason for repair.
Drainage system: when murmur is a sign blockage
The second most common cause of extraneous sounds is the condensate drainage system. During operation, moisture forms on the walls of the chamber, which flows into a groove and goes through a tube into a container above the compressor, where it evaporates. If an obstacle occurs in this chain, water begins to accumulate and gurgle, creating a “waterfall” effect inside the case.
Often users are faced with a situation where sound appears precisely at the moment of defrosting or immediately after it. This indicates that the melt water does not have time to leave and splashes in the pan or gets stuck in the tube. Clogged drainage hole is a common problem, especially in refrigerators with a No Frost or drip defrosting system, where less attention is paid to the hygiene of moisture removal.
To check, you need to inspect back wall of the refrigerator compartment. There is usually a hole at the bottom covered with a plastic plug or grille. If you see a puddle of water or ice there, it means the passability is impaired. Water can also stagnate in the groove itself, creating a constant squelching sound with each movement of air from the fan.
How to clean the drainage without disassembling the case?
For cleaning, you can use a special brush (often included) or a soft wire with cotton wool at the end. Carefully insert the tool into the hole and make several forward movements. Then add 10-20 ml of warm water to check the permeability.
If you ignore this problem, water may begin to leak onto the floor or, worse, get onto electrical components. Regular drainage cleaning is an obligatory part maintenance, which is recommended every six months.
☑️ Checking the drainage system
Diagnostics of the compressor and fan motor
The heart of the refrigerator - the compressor - can also be the source of the murmur, but the nature of the sound here will be different. If you hear not just fluid flowing, but a humming sound that turns into gurgling, or a metallic clanging sound, this may indicate wear on the internal parts of the motor. In some cases, the oil in the compressor becomes too thick or, conversely, thins out, which changes the acoustics of its operation.
Particular attention should be paid to models with the system No Frost. In addition to the compressor, they have a fan that blows cold air. If ice forms on the fan blades or bearings, the fan begins to hum and make intermittent sounds that can be confused with gurgling sounds. This often happens due to a loose door fit or a malfunction of the defrost heating element.
To accurately diagnose the source of the sound, you can use a simple method: put your ear to the back wall (where the motor is located) and to the inner wall of the refrigerator compartment. If the sound comes from inside and is accompanied by vibration of the shelves, there may be a problem with the evaporator mounting. If it “gurgles” from the back below, most likely this is the operation of the compressor or the evaporation of condensate in the tray.
| Sound type | Probable cause | Normal or breakdown | Necessary actions |
|---|---|---|---|
| Quiet gurgling | Freon circulation | Normal | Observation |
| Loud overflow | Clogged drainage | Requires attention | Cleaning the drain hole |
| Gurgling with humming | Compressor malfunction | Breakage | Call a technician |
| Intermittent noise | Ice on the fan | Defrost failure | 24 hour defrost |
The effect of incorrect installation on acoustics
Often the reason that something is murmuring in the refrigerator is trivial and lies in the incorrect installation of the unit. If the housing is not level, the refrigerant in the tubes may circulate unevenly, creating areas of turbulence and increased noise. In addition, the misalignment affects the operation of the door hinges and the tightness of the seal, which indirectly leads to problems with drainage and freezing.
Checking the horizontal level is carried out using a building level. It is important to position the refrigerator so that it is stable on all four legs. Many modern models have an adjustable height of the front supports, which allows them to compensate for uneven floors. Vibrationtransmitted to the floor also enhances the audibility of internal processes.
Another important nuance is the distance to the walls. The instructions for any equipment require maintaining clearances for ventilation. If the refrigerator is moved close to a wall or furniture, the sound wave is reflected and amplified, creating resonance. In addition, overheating of the condenser due to poor ventilation changes the operating modes of the compressor, making it noisier.
It is also recommended to check whether the refrigerator tubes are touching each other or the cabinet walls. The vibration of a running motor causes them to touch, which creates a rattling noise that can easily be mistaken for internal murmur. Gently move the tubes away by hand (only when the unit is turned off and cooled down!) or use special separators.
When noise signals a serious malfunction
There are a number of signs that indicate that rumbling is a symptom of a serious breakdown that requires specialist intervention. If the sounds are added to the lack of cold, continuous operation of the engine without shutdowns, or the appearance of an unpleasant odor, you cannot hesitate. Freon leak is one of the most common reasons for changes in the acoustics of the unit.
When a refrigerant leaks, less working substance remains in the system, and it circulation becomes chaotic. The sound becomes more whistling or, conversely, intermittent, with long pauses. The compressor tries to compensate for the lack of pressure and wears out. In such cases, you can often hear gas escaping noisily from the hole if the leak has occurred in an accessible place.
⚠️ Attention: If you hear a hissing sound similar to the release of gas under pressure, immediately unplug the refrigerator from the outlet, open the windows for ventilation (especially if there are children or animals in the house) and call a technician. Self-refilling with freon is dangerous and requires special equipment.
Another serious problem is hydraulic hammer in the compressor. This happens if liquid freon instead of gaseous freon enters the engine cylinder. This can happen if the thermostat malfunctions or after prolonged operation in abnormal mode. The sound in this case resembles a strong blow or a dull knock, followed by an active murmur.
You should also be wary if the murmur is accompanied by the appearance of a “fur coat” or ice in the wrong places, for example, on food or on the door. This indicates a violation of the defrost cycle. In No Frost systems, the evaporator heating element, timer or defrost sensor could fail, as a result of which the ice does not melt, but grows, blocking the airflow channels and creating noise effects.
Is it possible to operate a refrigerator with a freon leak?
It is absolutely not possible. Operating a compressor without sufficient refrigerant will cause it to overheat and burn out the windings. Repair in this case will cost 2-3 times more than timely refueling and leak detection.
Prevention and care of the refrigerator
To minimize the risks of extraneous sounds and extend the life of the equipment, you must follow the operating rules. Regular defrosting (even for No Frost systems, a preventative shutdown once a year is recommended) helps keep hard-to-reach places free of ice and dirt. Keeping the condenser at the back of the refrigerator clean is the key to quiet operation of the motor.
Monitor the condition of the rubber seals. If they become dirty or lose their elasticity, warm, moist air enters the chamber. This leads to increased formation of condensation, overloading the drainage system and, as a result, gurgling water. Wipe the seal with a soft cloth and soapy water once a month.
Do not overload the refrigerator with food. Too dense packing interferes with air circulation, which forces the fan (if there is one) to work with overload, and the compressor takes longer to cool the chamber. Compliance with product proximity and storage rules also affects the efficiency of the unit.
⚠️ Attention: Never use sharp objects to chip ice in the chamber. Damage to the evaporator will lead to an immediate leak of freon and the appearance of a characteristic hissing sound, after which the refrigerator will stop freezing.
FAQ: Frequently Asked Questions
Is it normal for the refrigerator to hum immediately after purchase?
Yes, this is normal. A new refrigerator may be louder due to parts that have not yet been worn in and the peculiarities of refrigerant transportation. Let it sit off for 4-6 hours, then turn it back on. Within 1-2 weeks, the sounds should become quieter.
Why does sound appear only at night?
During the day, background noise in the apartment (conversations, TV, street) masks the operation of equipment. At night, in silence, the natural sounds of freon circulation and compressor operation become clearly audible. If the temperature is normal, there is nothing to worry about.
Can murmurs be a sign that the refrigerator is about to break down?
The murmur itself is rarely a sign of an imminent breakdown. More often than not, this is a design feature. The alarm should be sounded only when the sound is combined with a lack of cold, continuous operation of the engine, or the appearance of puddles of water.
How to distinguish the sound of a running compressor from the sound of water?
The sound of a compressor is usually lower-frequency, humming, and is accompanied by vibration of the housing. The sound of water (murmuring, gurgling) is higher-pitched, changeable and often comes from inside the chamber or from below at the back where the tray is located.