Buying new household appliances is always an event accompanied by the expectation of comfort and silence, however, users are often faced with a situation where a new refrigerator is loud immediately after switching on. During the first hours of operation, the unit may make sounds that seem unnatural for a fresh device: humming, gurgling or periodic clicking. Understanding the nature of these sounds is critically important, as it allows you to distinguish normal operation from a real technical defect.
Modern models are equipped with powerful compressors and complex refrigerant circulation systems, which is inevitably accompanied by an acoustic background. Inverter engineswhich are positioned as quiet, with at startup or a sudden change in temperature conditions, they can emit a specific low-frequency hum. It is important not to panic ahead of time, but to carefully listen to the nature of the sound and analyze the installation conditions.
In this article we will analyze in detail the physics of the processes occurring inside the chamber and the engine compartment so that you can independently diagnose the source of the noise. We will consider both absolutely normal phenomena and situations that require the intervention of a specialist or adjustment of the position of the case.
Natural sounds during first startup and operation
The first 24 hours of operation is a period of adaptation of all systems refrigeration equipment to new environmental conditions. At this time, the compressor can work almost non-stop, trying to cool the warm internal volume to the specified parameters. It is during this period that the load on the engine is maximum, which explains the increased noise level compared to subsequent operation.
The sound of a running compressor is the main source of hum. Depending on the engine type, the sound may vary. Old models with conventional engines hum monotonously, while modern ones inverter systems can change their tone, either dying down or intensifying the hum. This is not a breakdown, but indicates an attempt by the electronics to accurately maintain the temperature.
⚠️ Attention: If the humming is accompanied by strong vibration of the housing, which is transmitted to the floor or nearby objects, it is necessary to check the horizontal installation, as this increases the resonance.
In addition to the motor, the noise There may be other elements as well. For example, the movement of refrigerant through the pipes is often accompanied by sounds reminiscent of water pouring or gurgling. This happens because freon changes its state of aggregation, moving from liquid to gas and back. Such sounds can be heard even after the compressor is turned off.
The influence of transportation and installation on the noise level
One One of the most common reasons why new refrigerator makes strange sounds is improper transportation or incorrect installation. The unit may have been tilted at an angle of more than 40 degrees upon delivery, causing oil to flow from the compressor into the refrigerant circuit. When first started, the motor tries to push this oil back, which causes a loud knock, rumble or water hammer.
If the device has been heavily swung, the system needs time to stabilize. In such cases, it is recommended not to plug in the device immediately, but to let it stand in an upright position for several hours. This will allow the oil to drain into the compressor crankcase and restore the correct distribution of the refrigerant.
How long should the refrigerator be left to stand after transportation?
If transportation was carried out in a vertical position, 2-3 hours is enough. If the device was lying on its side, the minimum settling time should be 8-12 hours, and in winter - up to 24 hours, so that the condensation inside the electronics completely evaporates and the oil returns to its place.
The second important aspect is the geometry of the installation. The kitchen floor is rarely perfectly level. If the refrigerator is not stable, on two or three legs, the vibration from the running motor increases many times over. The body begins to rattle, and the legs begin to creak on the floor covering. Adjusting the support screws allows you to level the unit and reduce the noise level to a minimum.
☑️ Correct installation of the refrigerator
Features of the No Frost and defrost system
Owners of modern models are often surprised to discover that which refrigerator with No Frost is louder than their previous units with a drip system. This is due to the presence of additional fans that provide forced circulation of cold air inside the chambers. The constant flow of air creates a characteristic noise that can be heard even when the door is closed.
The fan may hum differently depending on the operating mode. When you open the door, the fan usually stops so as not to blow cold out, and the noise disappears. If the sound comes specifically from the air flow, then this is a normal situation. However, if the fan makes a grinding or cracking noise, this may indicate ice has frozen on its blades or a bearing failure.
The automatic defrost system also contributes to the acoustic background. Periodically, usually once every 8-12 hours, the defrosting heating element turns on, and you may hear crackling or clicking sounds. This is the expansion and contraction of the plastic of the inner box or the cracking of melting ice falling into the evaporator pan. The sound of dripping water at this moment is also normal.
⚠️ Attention: In models with the No Frost system, do not allow food to block the ventilation holes, as this disrupts circulation and causes the fan to work with increased load and noise.
Mechanical reasons: fasteners, packaging and vibration
Often the answer to the question “why a new refrigerator is loud” lies in the little things that were missed during unpacking. Manufacturers use various transport locks that must be removed before first use. Left fasteners can cause metal parts to rattle against the housing.
Pay attention to the following elements that may have remained inside or outside:
- 🔩 Transport bolts on the rear wall (if provided by the model), which secure the compressor suspension springs.
- 📦 Pieces of foam, tape or plastic film stuck between the radiator grille and the body.
- 🥤 Bottles, cans or other dishes standing on the top lid of the refrigerator that resonate from vibration.
- 🍽️ Dishes inside cameras, which is too close to the back wall and vibrates from the air flow.
It is also worth checking whether the rear grille (radiator) is touching the wall or cabinet. As the compressor operates, it heats up and expands, which can cause occasional cracking or buzzing noises from metal to metal contact. The optimal distance from the back wall to the obstacle should be at least 5-7 cm.
If the refrigerator is standing on slippery linoleum or tiles, vibration can be transmitted to the floor, creating the effect of “walking” equipment. In such cases, it is recommended to use special anti-vibration pads under the feet. They dampen vibrations and prevent the unit from moving.
Noise level standards and technical characteristics
To objectively assess The refrigerator is loud or not, you need to refer to the technical data sheet of the product. The documentation always indicates the sound pressure level, measured in decibels (dB). According to modern standards, a noise level of up to 40 dB is considered normal. Premium models can operate quieter - about 34-36 dB.
For comparison: 30 dB is a whisper, 40 dB is a quiet conversation, 50 dB is the sound of a typewriter. If your new unit produces sounds that subjectively seem louder than 45 dB, you should consider checking. However, it is worth considering that in an empty room at night, any sound seems louder due to the lack of background noise.
Below is a table with approximate noise levels for different types of compressors:
| Compressor type | Average noise level (dB) | Sound character | Features |
|---|---|---|---|
| Normal (linear) | 38 - 42 dB | Monotonous humming | Turns on and turns off with a characteristic click |
| Inverter | 34 - 39 dB | Uniform low hum | Works constantly, changing power, without sudden starts |
| Linear inverter | 33 - 37 dB | Barely noticeable | Minimum moving parts, high energy efficiency |
| Two compressors | 40 - 44 dB | Variable hum | Can work simultaneously, creating total noise |
It is important to understand that the values declared by the manufacturer are measured in special anechoic chambers. In real-life kitchen conditions, where there are hard surfaces (tiles, glass), sound can be reflected and seem louder. Therefore, subjective perception may differ from the numbers in the passport.
When you need to contact a service center
Despite the fact that many sounds are natural, there are signs indicating a malfunction new equipment. If you notice one of the following symptoms, you should not delay calling a technician, since the warranty period has already started.
Alarm signals:
- 🔊 Loud metallic clang or knocking when starting the compressor, which does not stop after warming up.
- 🌬️ A whistling sound, indicating a freon leak or problems with pressure in the system.
- 🔥 Strong heating of the side walls combined with continuous operation of the motor without entering the mode.
- 🔌 The smell of burning or burning plastic in the first minutes of operation (only a slight smell of new plastic is acceptable).
Particular attention should be paid to the situation when the refrigerator turns on, runs for a few seconds and turns off with a loud click, after which the cycle repeats. This may indicate a faulty start relay or problems with the electrical network (low voltage).
⚠️ Attention: Repairing a new refrigerator yourself, including removing the back panel or attempting to top up freon, will instantly void the warranty. If there are real suspicions of a breakdown, call an authorized specialist.
Summary diagnostics and frequently asked questions
To summarize, we can say that in most cases loud operation of a new refrigerator is a temporary phenomenon or a consequence of incorrect installation. A thorough analysis of the nature of the sound, checking the installation level and studying the instructions allows you to solve 90% of problems without calling a technician.
If you doubt the serviceability of the equipment, try recording the sound on a voice recorder (near the motor and at a distance of 1 meter) and compare it with reference recordings of the operation of similar models that can be found on the Internet. This will help you talk more substantively with a service center employee.
Do not forget that the equipment requires a “break-in” period. During the first week of operation, sounds may change, become quieter or change in pitch. The main thing is the absence of progression of noise and the appearance of new, previously unheard defects.
Is it normal for the refrigerator to hum immediately after turning it on?
Yes, this is absolutely normal. During the first hours, the compressor operates at maximum power to cool the empty volume. The hum may be stronger than usual, but it should be smooth, without knocking or squealing.
Why does the refrigerator click and not turn on?
A click usually means an attempt to start the motor. If there is no buzz after the click, the start relay may be faulty, the compressor has burned out, or the voltage in the network is too low. Diagnostics by an electrician is required.
Can the noise level depend on the time of day?
The refrigerator itself does not change the volume at night, but due to the absence of background noise (TV, conversations, street), the operation of the compressor and the gurgling of freon become more noticeable to the ear.
What what to do if the refrigerator is crooked?
You need to take a building level, place it on the top cover and, by rotating the adjusting feet, achieve a horizontal position. This will remove distortion and reduce vibration.
Does filling the chambers affect the noise?
Yes, an empty refrigerator is louder, since the products have nowhere to absorb sound waves, and the compressor works longer to cool the air. A filled chamber is quieter and more stable.