After delivery and connection of household appliances, owners are often faced with a situation where the unit makes noise unusual sounds. The question of how long a new refrigerator will hum is of concern to many, because the hum can continue for hours, giving no rest. In most cases, prolonged operation of the motor on the first day is an absolutely normal mode, necessary for the system to reach the specified temperature conditions.
However, there are reasonable limits, exceeding which may indicate a malfunction or violation of installation rules. Understanding the physical processes occurring inside the refrigerant circuit will help you distinguish normal operation from a critical situation. First start-up always takes longer than subsequent cooling cycles.
Physics of the first start and entering the mode
At the moment of switching on empty the chamber is at room temperature, and the compressor requires considerable time to cool the entire volume of air, as well as the walls and shelves.
The process can take from 2 to 24 hours, depending on the model and volume of the chamber.
During this period compressor works almost without interruption, creating a characteristic hum that may seem louder than usual due to the lack of pauses.
The thermostat or electronic control unit will not turn off the motor until the set temperature is reached inside.
If you loaded the refrigerator with food immediately, the operating time will increase, since warm things need to give up their heat.
Refrigerant the tubes begin to circulate intensively, which is also accompanied by the sounds of gurgling and liquid flow.
⚠️ Attention: If the refrigerator hums continuously for more than 24 hours and the inside does not get colder, there may be a freon leak or the compressor is jammed.
It is important to consider that modern inverter models work differently than old linear ones.
They may not turn off completely, but only reduce the speed, maintaining a constant quiet hum.
This is not a breakdown, but a feature inverter technology.
Standard operating time of the compressor
In normal operation, the refrigerator should not work continuously.
Operation cycle depends on the load, room temperature and frequency of door opening.
B Normally, the unit should work about 30-40% of the total time, the rest of the time it rests.
However, in hot weather or when heavily loaded with warm products, this percentage may increase.
Heat transfer in the condenser (grid at the back) must be efficient, otherwise the motor will overheat and hum longer.
Check whether the back wall of the refrigerator is pressed against the wall, which interferes with cooling.
There are average indicators for different types equipment.
Below is a table that helps you navigate the expected operating time.
| Refrigerator type | Expected first start time | Operating mode is normal |
|---|---|---|
| Single-chamber | 2-4 hours | 10 min work / 30 min rest |
| Double-chamber (No Frost) | 4-8 hours | 15 min work / 20 min rest |
| Side-by-Side system | 8-12 hours | 20 min work / 15 min rest |
| Inverter | Continuous (quiet) | Works without shutdowns |
If your indicators differ greatly from the table ones, it is worth analyzing the operating conditions.
Perhaps the room is too hot or the door does not close tightly.
Seal plays a key role in maintaining cold and the frequency of switching on.
The influence of installation and transportation on noise
Often the reason that the refrigerator is humming is due to improper installation after delivery.
During transportation, the equipment could be subject to shaking, tilting or shock.
If the unit was transported lying down, oil from the compressor could get into the refrigerant circuit.
Why can’t you turn on the refrigerator right away?
If you turn on the unit immediately after horizontal transportation, the compressor can run “dry” or with oil in the system, which will lead to water hammer and valve failure. It is necessary to allow the oil to drain back into the compressor crankcase.
In such cases, you need to wait a certain time before turning it on for the first time.
For summer transportation, 2-3 hours are enough, for winter - up to 4-6 hours in a warm room.
If these rules are not followed, compressor will work with increased load and noise.
It is also important to level the equipment.
Casing distortion causes vibration, which increases the hum and is transmitted to the floor or furniture.
Use adjustable supports for horizontal position installation.
⚠️ Attention: Do not install the refrigerator near heat sources (radiators, stoves), this will make it work almost without interruption.
Check whether the vibrating parts of the body are touching the cabinet walls or other objects.
Even a minimal touch can turn a quiet hum into a loud rattling sound.
Vibration is the main enemy of silence in the operation of household appliances.
Differences in types of compressors and cooling systems
The nature and duration of the hum directly depend on the type of engine installed.
Linear compressors operate on the principle of “turned on - cooled - turned off.”
At the moment of starting and stopping, they emit a characteristic click and a short-term intense hum.
Inverter models, on the contrary, are constantly running.
They smoothly regulate power, so there are no sharp startup sounds.
It is normal for them to hum quietly 24 hours a day, changing only the tone of the sound.
The system No Frost also makes adjustments to the sound background.
Periodically (every 8-12 hours) the fan turns on and a defrosting sound can be heard evaporator.
This may be accompanied by the crackling of plastic or the noise of pouring water.
The capillary system (crying refrigerator) is usually quieter.
However, the sounds of gurgling in it are more audible, since there is no noisy fan.
Circulation refrigerant in thin tubes creates specific sounds.
Extraneous sounds: normal or defect?
Not all sounds made by a new refrigerator are normal.
You need to be able to distinguish operating hum and sounds of malfunction.
A uniform low-frequency hum is a sign that the motor is working properly.
If you hear a metallic clanging, knocking or whistling sound, this is a cause for concern.
Whistling may indicate that freon comes out under pressure through a microcrack.
A knock often indicates that the compressor “cannot start” or the bushings are worn out.
☑️ Noise diagnostics
Loud gurgling and "overflowing" are usually normal, but only if they are not accompanied by a lack of cold.
Sharp clicks of the relay are acceptable when turning on and off, but not during operation.
If the refrigerator makes sounds similar to the operation of a hammer drill, immediately disconnect it from network.
Pay attention to the fans in the No Frost system.
If ice is frozen on the blades (due to poor door sealing), they will make noise.
Fan may touch ice, creating a cracking sound.
When it is necessary to call a technician
There are a number of symptoms when waiting does not make sense.
If the refrigerator is humming, but has not cooled for more than a day, diagnostics is needed.
This may mean a clogged capillary tubes or lack of refrigerant.
Strong heating of the side walls or grille at the back is an alarming signal.
Although slight heating is normal, scalding temperatures indicate overload.
Condenser cannot cope with heat transfer or the system is not working properly.
⚠️ Attention: Independent repair of the cooling system is prohibited and dangerous. For diagnostics and refilling with freon, a license and special equipment are required.
If you notice oily spots under the refrigerator, this is a sign of oil leakage from the compressor.
In this case, the unit must be urgently turned off and transported to a service center.
Further operation may permanently render motor out of order.
Also, a technician is needed if the noise appears suddenly after a long period of silence.
The new refrigerator should not sharply change the sound character without external reasons.
Check the warranty card before contacting the service.
Recommendations for reducing noise levels
In order for a new refrigerator to be quiet, it is important to choose the right place.
Avoid installation in niches where the walls fit tightly against body.
Vibration is easily transmitted to building structures, increasing the hum.
Use anti-vibration stands under the legs.
They dampen resonance and make the operation of equipment less noticeable.
Rubber mats will also help isolate sound from floor.
Is it possible to soundproof a refrigerator from the outside?
It is impossible to paste the refrigerator body with soundproofing materials. This will disrupt heat transfer, lead to overheating of the compressor and increased energy consumption.
Defrost the equipment regularly if you do not have a No Frost system.
A thick layer of ice makes the compressor work longer and noisier.
Keep the condenser grill at the back clean.
Dust and animal hair clog the radiator cells.
Cleaning with a vacuum cleaner every six months will improve cooling efficiency and reduce noise.
Correct care extends the life of equipment and maintains silence in the house.
Why does the new refrigerator hum louder than the old one?
New models often have more powerful compressors to meet energy efficiency classes. In addition, in an empty refrigerator, sound waves bounce off the walls more strongly, creating an echo. After loading food, the noise usually becomes less noticeable.
Is it normal for the refrigerator to gurgle after it is turned off?
Yes, this is absolutely normal. After the compressor stops, the refrigerant continues to flow through the tubes under the influence of gravity and residual pressure. These sounds can last for several minutes.
Can the floor level affect the volume of the hum?
Absolutely. If the floor is uneven, the refrigerator body warps, which causes distortion of the internal mechanisms of the compressor and increased vibration. Be sure to use a building level when installing.
How long can a refrigerator work without stopping in winter?
In winter, when the room is cool, the refrigerator may work less. However, if it is standing on an unheated balcony or near a cold window, the thermostat may “not see” the heat inside and not turn on the motor, or vice versa, the oil in the compressor will thicken and it will work with overload. The optimal temperature for operation is from +10 to +32 degrees.