A sudden loud hum, crackling or gurgling sound in the operation of refrigeration equipment is a signal that cannot be ignore. If your the refrigerator began to work louderthan usual, this may indicate either a minor malfunction that is easy to fix yourself, or a serious breakdown that requires the intervention of a technician. Often, owners notice a change in the sound background after moving, defrosting, or simply during long-term operation.
Primary diagnosis helps to understand the scale of the problem. It is necessary to listen to the nature of the sound: a monotonous hum, periodic knocking, whistling or sharp crackling indicate various malfunctions. It is also important to note when exactly the noise appears - immediately after switching on, while the compressor is running, or when the unit is turned off. In this article, we will look in detail at why refrigerator makes extraneous sounds and what steps need to be taken to eliminate them.
Ignoring the problem can lead to increased energy consumption and accelerated wear of expensive components. Timely identification of the source of sound allows you to extend the life of your equipment and avoid costly repairs. Next, we will look at the main technical causes of noise.
Main causes of noise
The most common reason the refrigerator hums loudlyis failure or wear of the compressor. This is the heart of the unit, which circulates the refrigerant. If the motor-compressor is overloaded or its fastenings are loose, the noise level increases significantly. In older models, noise may be associated with the natural wear of parts, while in new refrigerators this is often a sign of a factory defect or incorrect installation.
Another source of sound is the fan of the No Frost system. If ice accumulates on the blades or grease is produced in the bearings of the fan motor, a characteristic hum or rattling noise appears. Often refrigerator fan it starts to make noise after prolonged operation without defrosting. It is also worth checking the condition of the condenser located on the rear wall: if it is clogged with dust, the compressor works harder and noisier.
⚠️ Attention: If you hear a loud metallic knock or clanging immediately after turning on, this may indicate water hammer in the system or destruction of the internal valves of the compressor. In this case, it is better to stop operation until the technician arrives.
Do not forget about the refrigerant. If freon leaks or its pressure is disturbed, characteristic gurgling or hissing may occur in the tubes. Although the sound of gas movement itself is not always critical, a change in its tone often indicates a leak. In modern inverter models, noise may be associated with the operation of the electronics that control the motor speed.
Diagnostics by type of sound emitted
You can determine the cause of the breakdown by analyzing the nature of the sound. If the refrigerator is humming constantly and evenly, most likely the problem is vibration of the case or improper installation. If the sound is intermittent, similar to a grinding or crackling sound, attention should be paid to moving mechanical parts. Different models refrigerators may have their own acoustic characteristics, but a sharp change in the usual sound background is always an alarming sign.
Crackling and clicking noises often accompany the operation of the thermostat or start relay. However, if a cracking sound is heard inside the chamber, thermal expansion of plastic parts may occur or the ice on the evaporator may be breaking. A hum that turns into a whine usually indicates a problem with the compressor or fan. It is important to distinguish between operating sounds and sounds of a malfunction.
For a more accurate diagnosis, you can use the table of correspondence between sounds and probable causes:
| Sound type | Probable cause | Urgency of repair |
|---|---|---|
| Monotonous hum | Case vibration, poor installation | Low |
| Loud knocking | Faulty compressor, connecting rod | High |
| Crackling/Clicking | Thermoregulator, thermal expansion | Medium |
| Squealing/Whistling | Fan, bearing problems | Average |
Please note that in some cases the sound may be caused by external factors. For example, if refrigerator stands close to a wall or furniture, vibration is transmitted to them, increasing the noise. Checking the distance to surrounding objects is the first step in diagnosis.
Installation problems and vibration of the housing
Often the answer to the question why the refrigerator is loudlies not in a breakdown, but in incorrect installation. The unit must stand strictly horizontally. If the legs are unevenly twisted, the body warps, which leads to vibration and resonance of internal parts. To check the level, use a spirit level or a simple glass of water placed on the lid.
The second important aspect is the distance to the walls and furniture. The rear condenser grille requires free air flow. If refrigerator is moved close to the wall, the vibration is transmitted to the building structures, creating a rumble effect throughout the room. The optimal distance to the back wall should be at least 5-10 cm.
⚠️ Attention: Never install the refrigerator on a soft surface (carpet, thick carpet) without a hard base. This compromises stability and increases vibration, which can lead to compressor failure.
Also check that internal shelves or bottles are not touching the walls of the chamber. When the compressor vibrates, they can rattle, creating the illusion of equipment failure. Remove foreign objects and make sure that all drawers are inserted all the way.
☑️ Checking the installation of the refrigerator
Faults of the compressor and start relay
If eliminating external factors did not help and the refrigerator is humming still, the problem may be in the "motor". The compressor is the noisiest component of the unit. Over time, the bearings in it wear out, which leads to a howling or humming sound. In more severe cases, the internal suspension of the motor is destroyed, and it begins to hit the walls of the casing every time it starts.
The starting relay can also be a source of problems. If the contacts are burnt or the mechanism is stuck, the compressor may try to start, making a loud clicking and humming noise, but then shut down. This condition is dangerous due to overheating of the windings. In modern refrigerators refrigerators
If you suspect a compressor breakdown, you need to measure the noise level and the temperature of the casing. If the motor-compressor runs continuously and is very hot, but the cold does not build up in the chambers, this is a sure sign of a serious malfunction. Independent repair of the compressor is impossible and requires replacement of the unit by a specialist.
Is it possible to change the compressor yourself?
Replacing the compressor requires soldering copper tubes, evacuating the system and charging with freon. Without special equipment and skills, it is impossible to do this efficiently. An attempt to replace it yourself will lead to damage to the refrigerator and a potentially dangerous situation.
Noise of the fan and No Frost system
In refrigerators with the system No Frost fans are responsible for circulating cold air. If you hear a whistling, crackling, or humming sound coming from deep inside your freezer or refrigerator, there's likely a problem with the fan. The blades may touch ice formed due to a violation of the defrost cycle, or the lubricant may have dried out in the motor bearing.
Often refrigerator fan noisy due to ice freezing on the evaporator. The ice coat grows and begins to touch the rotating blades. In this case, completely defrosting the unit during the day helps. If after defrosting the noise returns after a short time, it means that the defrosting system (heating element, timer or sensor) is broken.
To replace the fan or check its operation, partial disassembly of the internal panel of the freezer is often required. It is important not to damage the fragile plastic and carefully disconnect the electrical connectors. In some models refrigerators access to the fan is possible only after removing the back wall.
When it is necessary to call a specialist
There are a number of situations when independent actions are not only useless, but also dangerous. If refrigerator emits loud bangs, a burning smell or burnt wiring, you must immediately disconnect it from the network. Also, the help of a specialist is required if, after defrosting and checking the installation, the noise does not disappear, and the performance has dropped (food begins to deteriorate).
The intervention of a professional is necessary if a freon leak is suspected (characteristic hissing and lack of cold) or if the compressor malfunctions. The technician has the necessary equipment to diagnose the pressure in the system and check the electrical parameters of the components. Repairing complex equipment requires qualifications and compliance with safety regulations.
You should not delay calling a technician if you notice that the compressor is running non-stop. This leads to overheating and other failure. Timely repairs are often cheaper than replacing a burnt-out motor or the entire refrigeration unit.
⚠️ Attention: If you smell a specific smell (not food, but chemicals or scorched insulation) combined with loud operation, immediately unplug the refrigerator from the outlet. This may be a sign of a refrigerant leak or a wiring fire.
Noise prevention and proper care
In order to refrigerator work quietly and for a long time, it is important to follow the operating rules. Regular defrosting (even for the No Frost system once every year and a half) helps to avoid ice build-up on the evaporator and fan jamming. Keep the rear condenser grill clean: dust and animal hair worsen heat transfer, causing the compressor to work harder.
Make sure the chambers are loaded. Shelves should not be overcrowded and food should not touch the back walls where the cooling elements are located. Proper food placement ensures free air circulation, which reduces the load on the fan and compressor. Also periodically check the condition of the rubber seals: if they do not fit tightly, the compressor will turn on more often.
When moving or transporting, follow the rules: refrigerator can only be transported in a vertical position or in compliance with the angle of inclination specified in the instructions. After transportation, turn on the unit no earlier than 2-4 hours so that the oil in the compressor flows into the crankcase. This will prevent dry operation and the associated noise.
Does the time of year affect noise?
Yes, in the summer the compressor works more intensely due to the high ambient temperature, so the noise may be more noticeable. In winter, if the refrigerator is standing on an unheated balcony, the oil in the compressor thickens, which can also temporarily increase the noise level when starting.
Why is a new refrigerator loud?
New models may work louder due to installation features (shipping bolts have not been removed, legs are not aligned) or the compressor has been running in. If the noise does not go away after a week, contact the service center under warranty.
Is it possible to lubricate the compressor so that it stops making noise?
Self-lubrication of the compressor is impossible, since it is sealed. Attempting to drill a hole will result in depressurization and failure. A noisy compressor must only be replaced.
Is it normal for the refrigerator to gurgle?
The sounds of liquid flowing (gurgling) in the tubes are normal. This is how the refrigerant and oil move. If this is not accompanied by a lack of cold, there is nothing to worry about.
How to check if the refrigerator is vibrating?
Put your hand on the side wall or top cover of the operating unit. If you feel a strong trembling that is transmitted to the floor or walls, you need to adjust the legs or check the internal motor mounts.