The purchase of new household appliances is always accompanied by the expectation of comfort and silence, but reality often makes its own adjustments. Many owners are faced with a situation when a newly installed unit begins to make unusual sounds: humming, gurgling or even vibrating. This causes natural concern, because I want to believe that modern equipment should operate silently.
However, there is no need to panic ahead of time. Noise at first start can be caused by many factors, most of which are absolutely normal for a working device. Understanding the physics of the processes occurring inside the cooling system will help to distinguish normal operation from a serious defect.
In this article we will analyze in detail the causes of extraneous sounds, methods for eliminating them on our own and situations when you need to contact a service center. Modern models of refrigerators equipped with complex systems, and knowledge of their operating features - the key to the long service life of the device.
Natural sounds when first started
The first hours of operation are the period of adaptation of all internal systems to new operating conditions. At this point, there may be an increased level of noise, which will subside or become less noticeable over time. The compressor, which is the “heart” of the refrigerator, begins to work at full power to cool the empty chambers to the specified temperature values.
Often users hear a characteristic gurgling or pouring of liquid. This is the sound refrigerant circulation (of freon) through the system pipes. Liquid gas changes into a gaseous state and back, which is inevitably accompanied by acoustic effects. You may also hear a clicking sound from the thermostat or relay that turns on and off to regulate the temperature.
It is important to understand that inverter compressorsthat most modern models are equipped with operate differently than their older linear counterparts. They do not turn off completely, but only slow down, creating a smooth, low-frequency hum. Such a sound may seem more intrusive in a quiet apartment, but it indicates energy efficiency and stable operation.
How much time does it take to stabilize?
Usually, it takes from 2 to 24 hours of continuous operation to completely stabilize the compressor operation and attenuate the primary noise. During this period, it is not recommended to completely load the chamber with products.
If you notice that the noise is uniform and is not accompanied by strong vibration of the housing, most likely everything is in order with the equipment. Give the device time to get into operating mode.
Problems with installation and transportation
One of the most common reasons why a new refrigerator is noisy is improper installation. Even a perfectly working unit will hum and rattle loudly if it is not level or touches the wall. Vibration from a running motor is transmitted to the floor and walls, amplified by resonance.
The second common mistake is ignoring the settling time after delivery. During transportation, oil from the compressor may have entered the cooling circuit. If you turn on the device immediately, it will work with overload and loud noise. It is necessary to let the equipment stand upright in a warm room for at least 2-4 hours (preferably more) before turning it on for the first time.
- 🔧 Adjusting the legs: Make sure that all support screws fit snugly to the floor, but are not twisted, so that the body does not wobble.
- 📏 Gaps: Leave a distance of at least 5-10 cm from the back wall to the wall of the room for free air circulation.
- 🚚 Transport bolts: Check that all fixing elements have been removed from the compressor (relevant for some models).
☑️ Checking for correctness installation
Pay attention to the surface on which the device stands. Linoleum or slippery tiles may contribute to the displacement of the unit during vibration, which will lead to knocking on adjacent furniture. In such cases, it is recommended to use special anti-vibration pads under the legs.
Interaction with furniture and surfaces
Sometimes the source of noise lies not inside the refrigerator, but in its surroundings. Built-in appliances or models that sit tightly in a niche of a kitchen unit often transmit vibration to shelves, cabinet doors or countertops. This creates a resonator effect, greatly amplifying even the quiet sounds of the motor.
Check that the shelves inside the refrigerator do not touch its walls. If you have just loaded food, make sure that bottles and containers do not touch each other or the walls of the chambers. When the compressor is operating, slight vibration of the shelves can cause glass containers to rattle.
Particular attention should be paid to the doors. If they do not fit tightly or the hinges are poorly adjusted, a characteristic ringing noise may occur when the compressor operates. Also check whether the handle of the refrigerator does not touch nearby furniture when opening or when closed.
Technical features and component defects
If installation errors are excluded, it is worth considering possible technical reasons. No Frost system fan is a frequent source of noise in modern models. When first started, the blades may touch ice (if there was moisture) or simply have a factory balancing defect, which causes a hum or whistle.
Another reason is poor-quality refrigerant or the presence of air in the system. This can cause gurgling sounds that continue even after several days of operation. In rare cases, there is a manufacturing defect in the compressor itself, when it operates with an increased noise level due to internal defects in the piston group.
| Sound type | Probable cause | Degree of danger |
|---|---|---|
| Uniform humming | Compressor operation | Normal |
| Gurgling, overflow | Freon movement | Normal |
| Crackling, clicking | Thermal expansion of plastic | Normal |
| Strong vibration of the case | Incorrect installation | Needs elimination |
| Whistling, grinding | Fan malfunction | Repair required |
It is worth noting that the noise level is often indicated in the technical data sheet in decibels (dB). A value of up to 40 dB is considered quiet, and up to 45 dB is considered medium. If your measurements (using an application on a smartphone) show values significantly higher than declared, this is a cause for concern.
The influence of operating mode and loading
The noise level directly depends on how the refrigerator is currently operating. During initial cooling or after loading a large amount of warm food, the compressor operates at maximum speed. In this mode, linear compressors can sound quite loud.
An empty refrigerator can also make more noise than a full one. The products inside play the role of sound absorbers and cold accumulators, due to which the compressor turns on less often and operates more quietly. If you just bought the appliance, let it run idle for several hours, and then gradually fill the chambers.
In the summer or in a hot room, the load on the cooling system increases. The compressor is forced to work longer and harder to maintain the set temperature, which naturally leads to an increase in the level of noise produced.
When to call for service
Despite the fact that many sounds are normal, there are “red flags” that cannot be ignored. If your new refrigerator makes loud metallic knocking noises, a high-pitched whistle, or a sound that sounds like a hammer drill, these are signs of a serious problem. Operation of such a device can lead to rapid failure of expensive components.
⚠️ Attention: If you hear a burning smell or see sparking in the compressor area, immediately unplug the device and call a technician. In this case, independent repair is dangerous.
Also a reason to contact a service center is a situation when the noise level does not decrease after 3-5 days of operation and proper installation. If the hum interferes with sleeping or being in the kitchen, it is better not to wait for the end of the warranty period, but to carry out diagnostics immediately. Remember that warranty card gives you the right to free repair or replacement of a faulty product.
Methods for reducing noise levels on your own
If the refrigerator is technically working, but the noise still causes discomfort, you can try to reduce its level using additional measures. One effective way is to install anti-vibration pads under the feet. They dampen vibrations and prevent sound transmission to the floor.
It is also worth checking the tightness of all internal elements: shelves, drawers, trays. Sometimes it is enough to place a piece of soft material (for example, silicone or foam rubber) at the point of contact between plastic and metal to eliminate rattling.
- 🧹 Cleanliness of the condenser: Make sure that the radiator grille at the back is clean; dust can cause additional fan noise.
- 🏠 Location: Do not place the refrigerator close to the wall, leave a ventilation gap.
- 🔩 Tightening fasteners: Check whether the case panels are securely fastened (if any access).
In some cases, changing the operating mode helps. Setting the temperature 1-2 degrees above the minimum can reduce the load on the compressor, making it less noisy without harming the food.
⚠️ Attention: Do not attempt to disassemble the compressor or open the cooling system yourself. This will void your warranty and can be life threatening due to high pressure and electricity.
Frequently Asked Questions (FAQ)
Is it normal for a new refrigerator to make a loud noise on the first night?
Yes, it is absolutely normal. In the first 10-24 hours, the compressor works almost non-stop to cool the internal volume and products. After entering the mode, it will turn on less often, and the noise will become less noticeable.
Why does the refrigerator gurgle even when the compressor is turned off?
The sound of flowing liquid may persist for some time after the motor is stopped. This continues the process of equalizing the pressure in the system and the movement of the refrigerant under the influence of gravity. If the gurgling sound is not accompanied by other symptoms, this is not a malfunction.
Can the noise level depend on the mains voltage?
Yes, unstable or low voltage in the mains can cause the compressor to work with overload, which increases the level of noise and humming. In such cases, it is recommended to use a voltage stabilizer.
What to do if the refrigerator is level, but still vibrates?
Try placing special rubber anti-vibration mats or a thick rubber band under the legs. Also check whether the refrigerator body is touching adjacent furniture or walls - even a light touch can cause resonance.