Suddenly appeared or sharply increased noise in the refrigerator can unsettle any person, especially if the equipment is in the kitchen combined with a living room or bedroom. Extraneous sounds often become the first signal that the unit is operating abnormally, although in some cases this may simply be a consequence of natural physical processes. Understanding the nature of the occurrence of sound waves inside the chambers and the engine compartment allows you not only to save your nerves, but also to prevent serious damage to expensive equipment.
Before calling a technician or looking for the number of a service center, it is necessary to carry out an initial diagnosis, carefully listening to the nature of the noise emitted. Humming, knocking, gurgling, hissing or crackling - each of these sounds indicates a specific component or process that requires your attention. In this article, we will analyze in detail why refrigerators they begin to make noise, how to distinguish normal operation from a malfunction, and what measures you can take on your own to fix the problem.
Ignoring loud sounds can lead to complete failure of the compressor or a refrigerant leak, so it is important not to delay resolving the issue shelved. Timely identification of the cause of noise extends the life of equipment and saves the repair budget.
Natural sounds of refrigeration equipment
Modern models of household appliances, despite all the improvements, cannot operate absolutely silently. There are standard soundsthat do not indicate a breakdown, but are part of the operating cycle. For example, a quiet gurgling or pouring of liquid is often heard immediately after the compressor stops or when it starts. This moves refrigerant (freon) through the pipes of the system, changing its state of aggregation from liquid to gaseous and back.
Periodic cracking of the plastic of the inner walls of the chamber or housing is also considered normal. This happens due to thermal expansion materials: with a sharp change in temperature, the plastic contracts or expands, making characteristic clicks. This is especially often observed in models with a system No Frost during evaporator defrost cycles.
⚠️ Attention: If a quiet hum is replaced by a loud, increasing hum that does not stop for a long time, this may indicate an overload of the engine or a malfunction heat transfer.
It is important to take into account the age of the equipment. Old models running on mineral oils simple compressors are always louder than modern inverter units. If your refrigerator has been in operation for more than 10 years, moderate noise may simply be a consequence of the natural wear and tear of rubbing parts, which are no longer lubricated as effectively as during (factory) assembly.
Diagnostics by the type of noise emitted
To understand what exactly happened to refrigerator, it is not enough just to know that it is noisy. It is necessary to classify the sound. Acoustic diagnostics allows you to narrow down the scope of troubleshooting. The nature of the sound directly depends on which unit is under load or has failed.
Let's consider the main types of sounds and their probable causes:
- 🔊 Loud hum or roar: Most often indicates problems with the compressor. This may be wear of the bearings, malfunction of the valves, or the engine running “for wear” due to a lack of freon.
- 🔨 Knocking or clanging: Indicates mechanical contact of parts. Perhaps the compressor itself has become loose, or the internal pipes of the system are in contact with the motor housing when it vibrates.
- 💨 Whistling or hissing: Usually associated with a refrigerant leak or fan operation. If it squeaks when you open the door, this is normal (pressure equalization), if constantly, look for microcracks.
- 🌀 Vibration and rattling: Installation problem. The refrigerator is uneven, touches the cabinet wall or vibrates due to an unstable position on the floor.
Particular attention should be paid to sounds emanating from the bottom of the unit, where it is located compressor-condensing unit. This is where the main sources of noise are concentrated. If you hear a metallic ringing when starting, this may be a sign of a faulty start relay or destruction of the internal engine mount.
Installation problems and external factors
One of the most common reasons why the refrigerator began to make a lot of noise is a banal violation of the installation rules. Even a perfectly working unit will hum and vibrate if it is installed incorrectly. Vibration transmitted from the compressor to the housing, and then to the floor and walls, creating a resonating effect.
First of all, check the horizontal installation. Use a building level or just rock the refrigerator. If it is not stable, adjust the height of the front support legs. Often it is enough to tighten them so that the unit fits tightly on all four support points. Also make sure that the back wall of the refrigerator does not touch the wall or furniture - a gap of at least 5-7 cm is required for normal air circulation.
⚠️ Attention: Never place the refrigerator close to the wall without a gap. This leads not only to noise, but also to overheating of the condenser, which significantly reduces the life of the compressor.
Check whether there are any foreign objects on the refrigerator lid. Vases, cereal jars, or decorative items may resonate with the vibration of the cabinet, creating an unpleasant rattling sound. Remove all excess from the top panel and check the cleanliness of the area around it.
Faulty compressor and start relay
Compressor is the heart of the refrigerator, and it is this that creates the main noise level during operation. If you hear a loud, strained hum that doesn't stop even after reaching the set temperature, or if the engine tries to start and clicks and stalls, the problem is serious. In older models with an open compressor, noise could arise due to the wear and tear of mechanical parts; in modern sealed “pots” the reasons often lie in the electrics or internal suspension.
A frequent cause of knocking at startup is starting relay. This small element is responsible for supplying current to the motor windings. If its contacts are burnt or the mechanism is jammed, the relay will make a loud click, followed by an attempt to start and silence (or a second click). In such cases, the compressor may hum, but not start, which is dangerous for its windings.
Inside the compressor, the motor is suspended on special springs that dampen vibration. Over time, these springs can stretch, burst, or come off their hooks. As a result, during operation, the engine begins to hit the walls of the metal casing, producing a loud noise. Repair in this case is complicated: it requires flaring the casing, re-hanging the motor and re-sealing, which is often not economically feasible. metal clanging. Repair in this case is complicated: it requires flaring the casing, re-hanging the motor and re-sealing, which is often not economically feasible.
| Type of sound | Probable cause | Complexity repair | Need a technician |
|---|---|---|---|
| Monotonous hum | Compressor wear, lack of freon | High | Yes |
| Loud click and silence | Malfunction of the starting relay | Low | You can do it yourself |
| Metal knocking | Compressor, fan blades are loose | Average | Desirable |
| Plastic cracking | Thermal expansion | No | No |
If you notice that the compressor works almost without interruption and at the same time gets very hot, and the noise has become more intense, it may be refrigerant leak. The engine tries to compensate for the lack of freon by operating at maximum speed, which causes increased background noise.
Noise of the No Frost system and fans
Refrigerators with the system No Frost are equipped with fans that circulate cold air through the chambers. Over time, dust, moisture or ice gets into the fan bearings, which leads to the appearance of characteristic hum, whistle or crackling. The sound usually comes from the freezer compartment or from the technical compartment at the back.
The noise is often caused by ice freezing on the fan blades. This happens if the evaporator defrost cycle is broken: the heating element does not turn on, the timer is faulty or the defrost sensor is lying. As a result, the fan begins to touch the ice coat, producing a loud crash, similar to the operation of an airplane propeller. In such cases, it is necessary to completely defrost the refrigerator (for at least 24 hours) to check: if after defrosting the noise disappeared for a week and then returned, the problem is in the defrosting system.
Also, the fan bearings could simply have worn out their service life. In this case, only replacing a unithelps. Fortunately, the fans in most models are removable modules, and their replacement does not require complex tools other than a screwdriver and pliers.
⚠️ Attention: When working with fans of the No Frost system, be careful with the plastic blades - they are very fragile and easily break if handled carelessly.
The influence of fullness of chambers and products
Paradoxically, the contents of the refrigerator can also cause noise. An empty refrigerator makes less noise but works less efficiently. However, if products are placed incorrectly, they can create an acoustic effect. Glass jars touching each other or the walls of the chamber when the shelves vibrate create a ringing sound. Heavy objects on the door can cause it to rattle when it slams or the compressor operates.
Check that bottles or packages are not leaning against the back wall of the chamber where the cold air ducts are located. Vibration from passing air or from the operation of the system No Frost can be transmitted to the containers, causing them to “dance” and knock. Also make sure that the shelves are installed tightly in their guides and do not dangle.
When you need to call a specialist
There are a number of symptoms for which self-repair not only will not help, but can also aggravate the situation. If you hear a piercing whistle (a sign of a freon leak under pressure), smell a burning smell or see sparking in the area of the compressor, immediately disconnect the device from the network.
Also, the help of a specialist is necessary if:
- 🛠️ The compressor hums, but does not start, and after a while the relay clicks.
- 🛠️ The refrigerator has stopped freezing, while the motor runs constantly and is very noisy.
- 🛠️ There is a smell of burnt wiring or rubber.
- 🛠️ You suspect a refrigerant leak (oily spots under the compressor).
Remember that Opening the sealed circuit of the cooling system without a license and special equipment is prohibited and dangerous to health. All work related to replacing the compressor, filling with freon or repairing electronics must be carried out by qualified personnel.
Noise prevention and extending service life
In order for the refrigerator to please you with silence for as long as possible, it is important to follow simple operating rules. Regularly, at least once a year, maintenance: unplug the device, defrost it, wash it and, most importantly, check the cleanliness of the condenser grid at the back. A condenser clogged with dust causes the compressor to work with overload, which increases the noise level.
Monitor the condition of the door seals. If the rubber has dried out and does not fit tightly, warm air enters the chamber. The compressor is forced to work more often and longer to compensate for the heat gain, which inevitably leads to an increase in background noise and energy consumption.
Frequently asked questions (FAQ)
Why does a new refrigerator make loud noise in the first days?
New compressors often require a “break-in” period. The parts should rub against each other. Also make sure you remove all shipping bolts and film. If the noise does not subside after a week, this is a reason to contact service.
Is it possible to put the refrigerator on its side for transportation if it makes noise after that?
If after transportation on its side the refrigerator begins to make a lot of noise, it is possible that oil from the compressor has entered the cooling circuit. Let it stand vertically disconnected for at least 12-24 hours so that the oil flows back into the crankcase.
Is it normal for the refrigerator to gurgle after it is turned off?
Yes, this is absolutely normal. After the compressor stops, the pressure in the system is equalized, and the refrigerant flows to the lower part of the circuit, making the sounds of overflowing liquid.
How to reduce the vibration of a refrigerator with your own hands?
Use anti-vibration stands under the legs, check the horizontal installation with a level and make sure that the case does not touch furniture or walls anywhere.