Suddenly arising hum or increasing noise from refrigerator is a signal that cannot be ignored. If previously the equipment worked almost silently, but now makes sounds reminiscent of the operation of a tractor or rotary hammer, it means that there has been a failure in the system. Extraneous sounds They are not just irritating to the ear, they can indicate critical malfunctions that can lead to damage to products and expensive repairs.
Understanding the nature of sound helps to quickly diagnose the problem. This could be humming the motor, sharp crackling plastic, gurgling coolant or vibration of the housing. In some cases, it is enough to simply correct the position of the unit, in others, you will need to replace the components. Independent disassembly of the compressor is strictly prohibited due to high pressure and the presence of freon.
In this article we will analyze in detail why the refrigerator became work louder than usual, how to distinguish normal operating noise from a breakdown and what steps you need to take to fix the problem on your own or by calling a technician.
Normal operating noise: when there is no need to worry
Before you panic and look for a service center number, it is important to understand that modern refrigerators, especially models with the system No Frostcannot be absolutely silent. During operation, many physical processes occur: circulation of refrigerant, operation of fans, turning the compressor on and off. Users often mistake the normal functioning of equipment for a breakdown.
For example, quiet gurgling or overflowing of liquid inside the tubes is a consequence of movement refrigerant through the system. Even if the refrigerator is turned off, residual pressure may continue to cause such sounds for some time. Also considered acceptable is a smooth, monotonous hum of a running motor, which can be heard at a distance of 1-1.5 meters from the device.
- 🔊 A uniform low-frequency hum is a sign of the operation of a working compressor.
- 💧 Quiet gurgling or hissing is the movement of freon through the evaporator tubes.
- 🌬️ Fan noise - typical for systems No Frost during air circulation.
- 🧊 Thermal relay clicks - occur at the moments of switching on and off motor.
It is important to consider that the noise level depends on the model. Budget units often hum louder than premium models with inverter compressors. If you just bought the equipment, give it a couple of days to “grind in.”
Installation problems and external factors
One of the most common reasons why the refrigerator began to make noise is a banal violation of the installation rules. Vibration from the engine is transmitted to the floor and walls if the unit is not level. This causes resonance, which increases the hum significantly. Vibration of the case is the first sign that the legs are adjusted incorrectly or the floor is uneven.
Check the distance between the back wall of the refrigerator and the wall of the room. If the gap is too small, air circulation is disrupted, the motor overheats and begins to work with increased load, making louder sounds. Also make sure that the equipment does not touch other pieces of furniture or walls.
⚠️ Attention: Make sure that the refrigerator is strictly horizontal. Use a building level to check. Tilt can lead to improper operation of the oil drainage system from the compressor.
Often the source of noise is foreign objects. Vibration can be transmitted to nearby bottles, cans or kitchen utensils, creating a rattling sound that is mistaken for equipment failure.
To fix the problem, follow these steps:
- 🔧 Tighten the adjustable legs to level the position of the cabinet.
- 📏 Move the refrigerator aside from the wall at least 5-7 cm.
- 🧹 Remove all objects from the top panel and sides of the unit.
- 🧱 Check whether the walls of the cabinet or other furniture are touching.
☑️ Installation diagnostics
Faults compressor and start relay
If after checking the installation the noise does not disappear, the problem may lie in the “heart” of the refrigerator - the compressor. This is the most expensive and complex unit. A loud, intrusive hum that turns into a growl often indicates wear of the bearings or problems with the motor windings. Compressor This is a piston mechanism, and any wear of parts inside it leads to increased noise.
Another culprit is the starting relay. If it is faulty, the engine may hum but not start, or it may start with a loud clicking and humming noise. In such cases, thermal protection often triggers, and the refrigerator turns off after a few minutes.
Characteristic signs of problems with the motor:
- 🔨 Loud knocking or clanging when starting the engine.
- 🔥 Strong heating of the compressor housing (more than 70-80 degrees).
- 📉 Long-term continuous operation without shutting down.
- 💡 Flashing or lighting of the emergency temperature indicator.
Repairing the compressor at home is impossible and economically impractical. Usually a complete replacement of the unit is required. Replacement is also necessary if freon leaks or the system's seal is broken.
What is an inverter compressor?
Inverter models operate constantly, but with different power, so they are quieter than usual. However, if such a compressor begins to hum, this often indicates a problem with the electronic control unit or windings, and not with the mechanical part.
Ventilation and No Frost system
In refrigerators with a system No Frost fans are responsible for circulating cold air. Over time, dust, moisture, or ice freezes into the fan bearings, leading to imbalance and noise. The sound may resemble metal rubbing against metal or an intermittent hum.
Sometimes the fan blades touch frozen ice or frost. This occurs when the defrost system malfunctions or the door seal is broken. In such cases, the fan begins to crackle or hum with varying degrees of success until it thaws.
Table of typical sounds and their causes in the ventilation system:
| Type of sound | Probable cause | Solution method |
|---|---|---|
| Whistling or howling | Clogged air ducts | Defrost 24 hours |
| Ratchet | Ice on the blades | Checking the system defrost |
| Humm with vibration | Bearing wear | Fan replacement |
| Intermittent noise | Falled object | Inspecting the chamber |
Diagnostics often require removing the back panel in the freezer and visually assessing the condition of the fan. If ice is visible on the blades, the unit needs complete defrosting.
Rattling of tubes and fasteners
Sometimes the source of irritating sound is not internal mechanisms, but external structural elements. During vibration, the copper tubes running from the compressor to the condenser may come into contact with each other or with the walls of the housing. This causes a characteristic metallic rattling sound.
The mounting bolts of the compressor itself or the support shock absorbers may also become loose. If the rubber gaskets are worn out or come off, the vibration is transmitted directly to the metal frame, increasing the noise many times over. Shock absorbers play a key role in soundproofing the engine.
⚠️ Attention: Before touching the tubes and rear grille, be sure to unplug the refrigerator! Metal elements may be energized in the event of an insulation breakdown.
To eliminate rattling, you need to carefully bend the tubes, increasing the gap between them. Do not use force, copper breaks easily. To secure the tubes, you can use special plastic clamps or soft wire. If the problem is in the motor mounting, tighten the bolts or replace the rubber bushings.
When you need to call a technician
Not in all cases you should try to eliminate the noise yourself. There are situations when the intervention of an unqualified person can finally finish off a technique. If you hear a loud knock, whistle or smell something burning, it is better not to take risks.
This is especially true for situations where it is necessary to open a sealed circuit or replace the compressor. Special tools are needed here: a vacuum pump, a pressure gauge station, a burner. Without them, repairs are impossible.
The main signs of the need for professional repairs:
- 🛑 The compressor hums, but does not start (clicks and turns off).
- 🌡️ It does not cool in the chambers, although the motor is running.
- 💧 The appearance of oil or traces of freon near the motor.
- ⚡ Frequent knocking out of plugs or machines in the panel when turned on.
The technician will conduct diagnostics, measure the pressure in the system and check the electrical circuits. Only after this can you say for sure what caused the noise.
Prevention of noisy operation
In order for the refrigerator to work quietly and for a long time, it must be properly cared for. Regular defrosting (even for systems No Frost once a year) helps to avoid the formation of excess ice, which loads the fan and compressor. The cleanliness of the condenser at the back also affects the efficiency.
Do not overload the shelves with products. Heavy objects can create additional vibration. Make sure that food does not touch the back walls of the chamber, especially in the area where cold air exits.
Following simple operating rules will extend the life of your equipment:
- 🧼 Wash the door seals regularly so that they do not tan.
- 🌬️ Ensure good ventilation in the installation area.
- 🔌 Use a separate socket with grounding.
- 📅 Once a year, check the tightness of the fasteners.
Why does the refrigerator hum only at night?
At night, the overall noise level in the apartment decreases, and a working refrigerator becomes more noticeable. Also, at night, the voltage in the network may drop, which is why the motor works harder and makes a louder noise. Another reason is the absence of background sounds that mask the operation of equipment during the day.
Is it possible to lubricate a compressor if it is noisy?
No, the compressor is a sealed unit. Lubricant is added to it at the factory for its entire service life. An attempt to drill a hole for lubrication will lead to depressurization and release of freon, which will completely disable the unit.
Is it normal if a new refrigerator hums loudly?
New equipment can work louder in the first 2-3 days of operation, while parts are being ground in. If the noise is very loud, check that all transport bolts (if any) have been removed and that the equipment is installed correctly. If the hum does not subside after a week, this is a reason to contact the service.
Does the floor level affect the noise?
Yes, this is one of the main factors. On an uneven floor, the refrigerator wobbles, creating resonance. Be sure to use adjustable supports and a building level when installing.