A sudden hum from refrigeration equipment can disturb the peace in the entire apartment, turning the kitchen into a source of constant irritation. If the unit previously worked almost silently, but now makes loud noises, this is a sure signal that there are changes in the system that require your attention. Most often, the problem lies in violation of installation rules or natural wear and tear of the moving parts of the mechanism.
Extraneous noise can occur for various reasons: from a banal misalignment of the housing to serious malfunctions compressor or the refrigerant circulation system. You should not ignore the growing hum, as this can lead to premature failure of the equipment. In this article we will take a detailed look at the main factors influencing the noise level and tell you what to do in each specific situation.
The first thing you need to do is listen carefully to the nature of the sound. A monotonous hum, knocking, gurgling or sharp whistle - each of these sounds indicates a specific malfunction. Understanding the nature of the noise will help you quickly determine whether you can deal with the problem yourself or whether you will need to call a technician.
Violation of installation rules and case geometry
The most common reason why the refrigerator began to hum strongly is a banal violation of installation rules. If the body is not level, vibration from operating mechanisms is transmitted to the floor and walls, increasing significantly. Even a slight misalignment can cause the unit to begin to “walk” on the floor and make unpleasant sounds.
It is necessary to check the horizontal installation using a building level. Modern models are often equipped with adjustable legs that allow you to compensate for uneven floors. It is also important that the equipment does not touch walls or furniture, since when the compressor operates, vibration is transmitted to contacting surfaces, creating a resonating effect.
- 🔧 Check that the refrigerator is level and, if necessary, tighten the front legs.
- 📏 Make sure that the gap between the back wall and the wall is at least 5-7 see
- 🚫 Remove any objects that may touch the housing from the side or top.
Often users forget about the shipping bolts that secure the compressor during transportation. If they are not removed before turning on for the first time, the engine will operate under enormous overload and make a terrible roar. The transportation bolts must be unscrewed before use, otherwise the compressor may burn out in a matter of hours.
Malfunctions of the compressor and motor
The heart of any refrigerator is the compressor, and it is this that most often becomes the source of noise. If you hear a loud humming noise that fades in and out, the problem may be due to worn bearings or internal parts of the motor. Over time, the lubricant dries out, and the friction of metal parts against each other causes a characteristic sound.
In some cases, a hum may be caused by improper operation of the start relay. This element is responsible for starting the engine, and if it is faulty, the engine may hum but not start, or work intermittently. Long-term operation in this mode is dangerous for the motor windings and can lead to a short circuit.
If you notice that the compressor housing is very hot and the hum is accompanied by vibration, this may indicate an interturn short circuit. In such a situation, independent repair is almost impossible and requires replacing the unit.
- 🔊 Listen to whether the sound comes directly from the black "tank" at the back.
- 🌡️ Carefully touch the motor housing (only if it is not too hot) to assess the temperature.
- ⚡ Pay attention to the frequency turning the engine on and off.
⚠️ Attention: If the compressor hums but does not start, and after a few seconds a click is heard and the hum stops, immediately disconnect the device from the network. This is a sign of a malfunction of the starting relay or piston group wedge.
Modern inverter models are characterized by a low noise level, so the appearance of any hum should be alarming. Unlike older linear compressors, inverters operate smoothly, and a sudden change in sound almost always indicates an electronic or mechanical failure.
Problems with the cooling system and refrigerant
Sometimes users confuse the hum of the motor with the noise of the circulating refrigerant. Freon, moving through the pipes of the system, can make sounds reminiscent of gurgling or pouring water. In most cases, this is absolutely normal and indicates that the cooling cycle is running normally.
However, if a whistling sound is added to the sounds, this may indicate a gas leak. When the refrigerant passes through the hole at the depressurization point, a flow is created, which generates a whistling sound. In such a situation, the refrigerator stops freezing, and the compressor works non-stop, trying to compensate for the loss of cold.
Freezing of moisture in the capillary tube can also cause extraneous sounds. The ice plug prevents the free circulation of freon, creating excess pressure, which the compressor tries to overcome, working at its limit.
| Sound type | Probable cause | Degree of danger | Actions |
|---|---|---|---|
| Gurgling, overflow | Freon circulation | Normal | Observation |
| Sharp whistle | Refrigerant leakage | High | Call a technician |
| Loud cracking | Expansion of plastic/ice | Normal | Ignore |
| Monotonous hum | Compressor wear | Average | Diagnostics |
Vibration of internal elements and fans
In refrigerators with a No Frost system for circulation Fans provide air. If the fan blades are contaminated with dust or ice frozen on them, the balancing is disrupted, causing severe vibration and hum. Also, a source of noise can be loose fasteners of the fan itself.
Glass shelves or bottles standing on the door may rattle inside the chambers. When the compressor operates, the housing vibrates, and if objects are not standing tightly, they begin to resonate, creating the feeling that the unit itself is humming. Check that the food does not touch the back wall of the chamber.
Particular attention should be paid to the drainage system. If the drain hole is clogged, condensation may drip onto the operating elements or freeze, forming ice build-ups that, when thermally expanded, produce a crackling and humming noise.
- ❄️ Check the evaporator for ice that is interfering with the operation of the fan.
- 🧹 Clean the fan blades from dust and dirt.
- 🥤 Make sure that the dishes on the shelves are not close to each other.
☑️ Fan diagnostics
The influence of temperature and operating mode
The intensity of the refrigerator directly depends on the ambient temperature and the settings you set. If the room is hot and you have set the “Super Freeze” mode, the compressor will operate at maximum speed, which will inevitably lead to increased noise.
In the summer, the load on equipment increases significantly. The unit is forced to work almost without interruption in order to maintain the set temperature inside the chambers. During such periods, increased humming is more a feature of operation than a breakdown.
A sharp change in temperature, for example, when loading a large amount of warm products, also makes the motor work more actively. Try not to place hot foods in the chamber and distribute the load evenly throughout the day.
Some refrigerator models have an automatic defrosting system, during which the nature of the sound may also change. At this moment, you may hear the ice thawing or the valves clicking.
⚠️ Attention: Do not install the refrigerator next to heat sources (stove, radiator, sunny window). This forces the compressor to work in extreme mode, reducing its service life and increasing the noise level.
When you need to call a specialist
There are a number of symptoms in which independent actions can only cause harm. If, after checking the installation and internal shelves, the hum does not stop, and the nature of the sound indicates a mechanical breakdown, it is better to entrust the repair to professionals.
This is especially true for situations related to the tightness of the system. Any intervention in the freon circuit requires special equipment and skills. Trying to solder the tube yourself or replace the compressor without experience can lead to final breakdown of the unit.
Also, the help of a specialist is necessary if you hear a burning smell or see sparking in the area of the engine compartment. These are signs of an electrical malfunction, which is a fire hazard.
The specialist will conduct diagnostics using pressure gauges and testers, accurately identify the faulty unit and replace it. Professional repairs guarantee the restoration of tightness and proper operation of all systems.
Why did the old refrigerator begin to hum more than before?
With age, the engine bearings wear out, the lubricant dries out, and the fasteners weaken. Natural wear and tear causes the once quiet unit to become noisy. Sometimes the situation is saved by replacing shock absorbers or lubricating the motor, but often this is a sign of nearing the end of the compressor’s service life.
Is it possible to lubricate the compressor so that it stops humming?
Self-lubrication of the compressor is extremely undesirable and is often impossible without violating the tightness of the housing. A special oil is used inside, which circulates along with freon. Trying to add oil through the hole may damage the valves. It is better to replace the entire motor.
Is it normal if the refrigerator hums immediately after turning on?
Yes, in the first minutes after starting, the compressor runs at maximum speed to quickly increase the temperature. At this point the noise level may be higher than normal. If after 10-15 minutes the hum subsides, then the equipment is working properly.
How to reduce the noise of a refrigerator without repair?
Try to place anti-vibration mats made of thick rubber under the legs. Make sure nothing is rattling inside the cameras. Another effective method is to move equipment away from the walls so that vibration is not transmitted to building structures.