Suddenly appeared loud hum or an obsessive knocking in the refrigerator compartment can unsettle anyone. If your the refrigerator is noisythis does not always mean an expensive repair, but the problem cannot be ignored.
The first thing to do is to determine the nature of the sound. This could be a monotonous rumble, an intermittent hum or sharp blows.
In this article we will analyze in detail why the unit began to work louder than usual and what steps need to be taken to normalize the operation.
Diagnostics of the nature of the noise
Before grabbing the tools, you should carefully listen to the operation of the equipment. The nature of the sound wave often indicates which part has failed or requires adjustment.
If you hear a high-pitched whistlethe problem most likely lies in the refrigerant circulation system. When heard gurgling soundthis usually indicates normal freon flow, but in excess volumes it may indicate a leak or problems with the thermostat.
The vibration of the housing is often transmitted to the floor or walls, creating resonance, which is perceived as loud noise. It is important to distinguish between the operating hum of the engine and a mechanical knock.
- 🔊 Monotonous low-frequency hum - the work of the compressor.
- 🔨 Metallic knock - impacts of internal tubes or engine parts.
- 💨 A whistling sound - the release of gas under pressure through a narrow hole.
- 🐝 Buzzing - the operation of the fan or the No Frost system.
Some models, especially old Soviet or budget modern ones, have a high noise level in the passport data, which is their design feature.
If the device makes sounds only when turning on or off, this may be due to oil flowing into system.
Carefully study exact location of the sound source (back wall, bottom, inside the chamber), this will narrow down the scope of troubleshooting.
External factors and incorrect installation
Often the reason the refrigerator is humminglies not in a breakdown, but in a violation of installation rules. The unit must stand strictly horizontally and not touch walls or furniture.
Check the gap between the rear radiator grille and the wall. It should be at least 5-10 centimeters for free air circulation. If the equipment is built into a niche, the lack of ventilation will lead to overheating and increased noise.
⚠️ Attention: Make sure that the refrigerator does not touch the side walls of the cabinet or other furniture. Vibration during compressor operation will be transmitted to the structure, causing strong resonance.
Adjusting the legs is an important installation step. If the housing is skewed, the door may not fit tightly and the compressor may work harder.
Use a spirit level to check the position of the housing. Tighten the adjustable supports so that the weight is distributed evenly.
Sometimes foreign objects left on the top panel of the refrigerator (bottles, cans) begin to rattle from vibration, creating the illusion of a breakdown.
☑️ Checking the installation
Problems with the compressor and motor
The heart of the refrigerator is the compressor. If it begins to make uncharacteristic knocking or clanging, this may indicate mechanical wear of the internal parts.
In older models, the mount of the motor itself to the frame often becomes loose. Over time, rubber shock absorbers dry out and lose elasticity, no longer dampening vibration.
If you hear a loud click, followed by a buzzing sound, and then silence (and so on in a circle), the thermal protection relay may be triggered due to overheating or problems with the starting relay.
| Type sound | Probable cause | Difficulty of repair |
|---|---|---|
| Loud metal clanging | Destruction of the compressor suspension | Average |
| Long howling | Wear of fan bearings | Low |
| Rhythmic knocking | The tube got into the housing | Low |
| Humming and shutdown | Malfunction of the starting relay | Medium |
In modern inverter models compressor works practically silent, so any extraneous sound should alert the owner.
If the motor overheats, it may hum louder than usual. Check the temperature of the rear grille - it should not be hot.
Is it possible to change the compressor yourself?
Replacing the compressor requires special tools for soldering tubes and evacuating the system. Without experience and equipment, the work cannot be done - you can permanently damage the cooling system.
Ventilation and No Frost system
In refrigerators with a system No Frost fans are responsible for circulating cold air. Over time, their bearings wear out, which causes a characteristic noise.
If the fan is humming, ice may have frozen on its blades. This occurs when the defrost sensor or heater is faulty. An ice crust interferes with rotation, creating friction.
Sometimes a foreign object (a piece of packaging, a label) gets into the rotation zone of the blades, causing a cracking sound.
To check, you will have to remove the back panel inside the freezer. Be careful not to damage the fragile plastic and air ducts.
If the fan makes a "tractor" sound, it needs to be lubricated or replaced. In some models, it is enough to simply remove the ice.
Check the tightness of the air ducts. If they are displaced, the air flow can create a whistling sound.
Rattling of tubes and internal elements
The copper condenser tubes are located at the back of the refrigerator. When the compressor operates, they vibrate, and if two tubes come into contact or touch the housing, a metallic ringing occurs.
To eliminate this defect, you need to carefully move the tubes away from each other. This should be done with extreme caution, since copper is soft and breaks easily.
Inside the chamber, shelves, bottles or containers may rattle. Check whether the glass shelves fit tightly in their grooves.
Sometimes the plastic grill at the bottom of the refrigerator (above the compressor) rattles. Secure it or place a piece of foam rubber.
If the drawers are noisy, check the integrity of the guides. Broken runners will rattle when opening and closing.
When you need to call a technician
There are situations when independent repair is impossible or dangerous. If you do not have the skills to work with electrical appliances, it is better not to risk it.
If after defrosting and checking the installation the noise does not stopand the refrigerator stops freezing, diagnostics by a specialist is required.
Replacing the refrigerant, soldering tubes and compressor replacement require a license and special equipment.
⚠️ Attention: An independent attempt to bend the tubes or replace the relay without disconnecting from the network can lead to electric shock or freon leakage.
The technician will be able to accurately determine whether it is worth repairing the old unit or whether it is cheaper to buy a new one. Often the cost of replacing a compressor is 50-70% of the price of a new refrigerator.
Pay attention to the warranty. If it is still operational, any independent repair will lead to its loss.
Noise prevention and care
In order to refrigerator serve for a long time and quietly, it must be properly looked after. Regular defrosting (for drip systems) prevents the formation of a thick coat of ice that loads the motor.
Keep the condenser at the back clean. Dust and animal hair adhering to the black grille impair heat transfer, causing the compressor to work harder and louder.
Do not place hot foods inside. A sharp temperature change forces the cooling system to work in extreme mode.
Check the door seals. If they transmit heat, the refrigerator will turn on more often, which reduces the service life of the parts.
Timely lubrication of moving parts (if provided for by the design) prolongs the life of the mechanisms.
Why is a new refrigerator noisy?
New models may make noise in the first days of operation. Compressor parts are grinding in. Also, a modern engine can make sounds similar to gurgling water - this is normal for new refrigerants.
Can the noise level depend on the time of day?
Yes, at night extraneous sounds seem louder due to the silence in the apartment. In addition, the network voltage may be more stable at night, which affects the operation of the motor, but usually the difference is unnoticeable.
What to do if only the freezer is humming?
Most likely, the problem is in the No Frost system fan in the freezer compartment or in ice freezing on the evaporator. The fan needs to be defrosted or replaced.
Does the amount of food affect the noise?
A full refrigerator operates more stable, as the food accumulates cold. An empty refrigerator turns on more often, which may subjectively seem like a noisier operating mode.