Constant hum, sudden knocking or monotonous humming can turn a cozy kitchen into a test for the nervous system. Refrigerator noise often becomes the main irritant, especially in small apartments where the kitchen borders the bedroom. You should not ignore extraneous sounds, as they can signal serious malfunctions that can lead to expensive repairs or complete breakdown of the unit.
Before calling a technician or panicking, it is necessary to carry out an initial diagnosis. Often the reason lies not in a breakdown, but in improper installation or the natural processes of the equipment. In this article, we will look at why compressor can make sounds, how to distinguish normal operating noise from emergency noise, and what steps to take to fix the problem.
Understanding the nature of sounds will help you save time and money. Sometimes it is enough just to tighten the legs, but in other cases a replacement shock absorbers or repair of the motor is required. Let's look at the main scenarios.
Primary diagnosis: normal or broken?
Modern models of refrigerators, be it Indesit, LG or Bosch, make sounds during operation. This is due to the circulation of refrigerant, the operation of the compressor and fans. However, it is important to distinguish between background humming and alarm signals. Normal noise level usually less than 40 dB, which is comparable to a low whisper.
If you hear sharp clicking noises when turning on or off, it may be working. thermostat. At the same time, case vibration or rattling often indicates external factors. It is important to listen to the nature of the sound: is it monotonous, intermittent or increasing?
⚠️ Attention: If the noise is accompanied by a burning smell, strong vibration of the floor or failure of the refrigerator compartment, immediately unplug the device.
To accurately determine the source of the sound place your hand on different parts of the body. This will help localize the problem: is the hum coming from the motor at the back, or perhaps some shelf inside is rattling.
Installation problems and vibration of the case
The most common, but common reason is incorrect installation. If the refrigerator is uneven, compressor vibration it is transmitted to the floor and walls, increasing significantly. Even a slight misalignment can cause a loud hum.
Check that the legs are firmly seated on the floor. It often happens that one of the supports is twisted too much or, conversely, does not reach the surface. It is also worth checking the distance to the walls: the gap should be at least 5-10 cm for free air circulation.
- 🔧 Check the adjusting screws on the legs of the refrigerator.
- 🧱 Make sure the back wall does not touch the kitchen wall.
- 📏 Use a building level to check the horizontal level.
- 🚫 Do not place the refrigerator close to the furniture.
Sometimes vibration is caused not by the unit itself, but by objects standing on it. Microwaves, cans of cereal or decor can resonate with the frequency of the motor. Remove all excess from the top cover.
Internal sources of noise: shelves and products
Often the source of rattling is the users themselves, more precisely, the contents of the chambers. Glass shelves, if they are not tightly secured in the grooves, may jingle during operation compressor. Plastic containers coming into contact with each other create an unpleasant cracking sound.
Inspect the interior space. Perhaps the bottle of drink is positioned so that its neck touches the wall or another shelf. When vibrating, it causes a constant knocking noise. Also check the fastenings of the vegetable drawers: if they are skewed, the plastic may rub against the guides.
Pay special attention to the system No Frost. These models have fans. If food (for example, a bag of greens) gets into the rotation zone of the blades, you will hear a loud crack or hum, similar to the work of a propeller.
☑️ Checking the internal space
In some cases, the rear grille (condenser) rattles from the outside. It is secured with latches that loosen over time. Carefully adjust the grill tubes so that they do not touch each other.
Diagnostics of the compressor and motor
Compressor is the heart of the refrigerator, and it is this that creates the main noise. If the motor is old, it may hum louder than usual due to wear on internal parts. However, a new, newly purchased refrigerator may make more noise during the “break-in” period.
Inverter compressors, which can be found in models Samsung or LG, operate quieter and smoother. They do not turn off completely, but only change the power, so they do not have a characteristic shutdown click. But if such a motor begins to hum at high frequencies, this is a sign of overload.
| Sound type | Probable cause | Degree of danger |
|---|---|---|
| Monotonous hum | Normal operation compressor | Low |
| Loud knocking at start | Wear of the starting relay or motor mount | Medium |
| Whistling or squeaking | Fan malfunction or freon leak | High |
| Gurgling and overflow | Refrigerant circulation (normal) | Low |
If the motor hums very loudly and gets hot, it may not have enough lubrication or the bearings may have failed. In such a situation, replacement of the compressor is inevitable, but diagnostics must be carried out by a specialist.
Why are inverter motors quieter?
Inverter compressors do not operate in start-stop mode, like conventional ones. They smoothly regulate power, avoiding sudden surges in voltage and mechanical shocks during startup, which makes their operation almost silent.
Noise in the No Frost system and defrosting
Refrigerators with the system No Frost are equipped with fans to circulate cold air. Over time, ice can build up on the blades, affecting the balance and causing noise. Also, dust may have gotten into the fan bearings or the grease may have dried out.
If you hear a cracking sound similar to the crunching of branches, this may be the sound of ice breaking in the automatic defrost system. This happens when the heating element heats the evaporator. However, if the sound is too loud, the defrost sensor may be faulty and ice is freezing where it should not be.
In some cases, the fan begins to touch the ice. To fix the problem, you need to completely defrost the refrigerator within 10-12 hours. If after this the noise does not disappear, disassembly and replacement of the fan will be required.
⚠️ Attention: When defrosting, do not use sharp objects to chip ice - this may damage the evaporator tubes, which will lead to freon leakage.
Hydraulic noise and movement of freon
Often users are frightened by sounds similar to water pouring, gurgling or hissing. We hasten to reassure you: in 90% of cases this is normal operating process. The refrigerant (freon) circulates through the system, changing its state of aggregation from liquid to gaseous.
Sounds become more audible immediately after the compressor is turned off, when the pressure in the system equalizes. Also, hissing may occur when the door is opened, when warm air hits the cold evaporator.
However, if the gurgling sound is accompanied by a lack of cold, this may indicate a leak or blockage in the capillary tube. In this case, you cannot do without the intervention of a specialist.
Sometimes hydraulic noise increases if the refrigerator has recently been transported. In this case, it is recommended to let the equipment stand turned off for several hours before turning it on, so that the oil flows into the compressor crankcase.
When you need to call a specialist
There are a number of symptoms in which independent repair is not only useless, but also dangerous. If you hear a loud metal clanging, squealing, or smell burning wiring, stop using the appliance.
Also, help from a specialist is needed if the noise is accompanied by the fact that the refrigerator has stopped freezing, a “snow coat” appears on the walls, or the housing is receiving an electric shock. These signs indicate complex technical malfunctions.
- 🛑 The compressor hums, but does not start (you can only hear a click).
- 🛑 The motor runs continuously, without turning off, and gets very hot.
- 🛑 A whistle appears, indicating a leak refrigerant.
Remember that trying to open the sealed-system (soldered system) yourself or replace the compressor without a license and equipment can finally finish off the equipment.
Prevention and care of equipment
In order for the refrigerator to enjoy silence for many years, it needs to be properly looked after. Regularly wipe the rear grille from dust: a dirty condenser causes the motor to work with increased load, which increases noise.
Make sure that the refrigerator is not standing next to heat sources (stove, radiator). Overheating forces compressor to work more intensely. Also, do not overload the chambers with products beyond the norm.
Once every six months, check the tightness of the door and the condition of the seal. If the rubber has dried out, the motor will work more often to compensate for the loss of cold.
☑️ Scheduled maintenance
Following these simple rules will extend the life of your refrigerator and maintain silence in the house.
Frequently asked questions (FAQ)
Why does a new refrigerator make more noise than the old one?
Modern models often use more powerful compressors and environmentally friendly refrigerants that can circulate with greater pressure, creating more noise. In addition, sound resonates more strongly in an empty refrigerator. Give the equipment 2-3 weeks to adapt and fill the chambers with products.
Is it possible to lubricate the compressor so that it hums less?
No, modern compressors are sealed units. They are permanently filled with lubricant at the factory. An attempt to drill a hole for lubrication will lead to depressurization and failure of the motor.
Is it normal for the refrigerator to crack after defrosting?
Yes, this is due to thermal expansion and contraction of the plastic parts of the internal case. When the temperature changes, the plastic can make cracking sounds that go away over time.
How to reduce the noise of a refrigerator if it is in a niche?
Make sure that the side walls of the niche do not touch the body of the refrigerator. Leave gaps for ventilation. You can cover the side walls of the niche with sound-absorbing material, but only non-flammable.