The constant hum emitted by kitchen appliances can unsettle any person, especially if it disturbs the night's peace or interferes with concentration. When refrigerator begins to make unusual sounds, this is a signal that a malfunction has occurred in its operation or operating conditions have been violated. Ignoring such acoustic anomalies can lead to more serious breakdowns requiring expensive repairs or complete replacement of the unit.
Modern models of household appliances, be it Indesit, Atlant or premium Bosch, are designed to operate with minimal noise levels. However, the physical processes underlying cooling are not always silent. It is important to learn to distinguish between a normal operating hum and a sound indicating a malfunction. In this article, we will analyze in detail the mechanics of noise occurrence and action algorithms for the owner.
The first thing to do when a hum appears is not to panic, but to listen carefully to the nature of the sound. This could be a monotonous hum, an intermittent knock, a whistle, or a sharp vibration. Each of these sounds indicates a specific unit that requires attention. A critical sign is a sharp change in the usual rhythm of the compressor in combination with heating of the housing. Understanding the nature of the sound is the first step to solving the problem.
Natural causes of noise during operation
Not every sound coming from the kitchen is a sign of a breakdown. Many users mistake normal physical processes for a malfunction. For example, the circulation of refrigerant through the pipes of the system No Frost is often accompanied by gurgling or overflow of liquid. This is absolutely normal and indicates that freon is moving along the circuit, performing its cooling function.
It is also worth considering the operation of the automatic defrosting system. When the evaporator defrosts or the valves switch, a click or a short hum may be heard. Modern inverter compressors they work on a different principle than older models, and their sound background may be unusual for the ear, but technically sound.
If you have just installed a new unit, he needs time to adapt. The compressor needs to “develop” the oil, and the tubes need to take their working position. During the first 24 hours, the noise level may be higher than usual. However, if the humming does not subside after 2-3 days, you should pay attention to other factors.
- 🔊 Refrigerant circulation causes natural gurgling and flow noise.
- 🔄 Clicking of the thermostat or mode switching valve is normal.
- 🌬️ The operation of fans in the No Frost system creates a constant background hum.
- 🧊 The formation of ice and its chipping during defrosting may sound like a crackling sound.
⚠️ Attention: If the humming is accompanied by a lack of cold in the chambers, this is not a natural process, but a symptom of a serious freon leak or compressor breakdown.
Installation problems and cabinet vibration
One of the most common reasons why a refrigerator hums and vibrates is improper installation. Even a perfectly serviceable unit will create a strong resonant hum if it is not level. The vibration from the worker compressor is transmitted to the floor and walls, amplifying many times over. This not only irritates the ears, but can also lead to destruction of the internal components of the equipment.
Check the distance between the back of the device and the wall. It should be at least 5-7 centimeters for free air circulation. If the refrigerator is moved close to furniture or a wall, it begins to hum more strongly due to overheating of the capacitor and resonance. Also make sure that the equipment does not touch neighboring cabinets or the washing machine.
To eliminate vibration, you need to ideally set the horizontal. Use a spirit level to check the position of the top cover. Adjustment is carried out using the front support legs. By twisting or unscrewing them, achieve a stable position in which the refrigerator does not wobble when pressed lightly.
- 📏 Check the gap between the rear grille and the wall (minimum 5 cm).
- ⚖️ Level the body by adjusting the front legs.
- 🚫 Make sure that the refrigerator does not touch neighboring furniture.
- 🔌 Check whether the tube at the back is vibrating against the wall or floor.
It often happens that it is not the refrigerator itself that is humming, but objects located on it or inside it. Check if the water bottle is stable on the top panel. Look inside the chambers: if shelves or products touch the walls, they will transmit vibration, creating a humming effect.
Faults of the compressor and start relay
The heart of the refrigerator is compressor. It is this that creates the main pressure in the system. If this unit is worn out, has internal mechanical damage, or operates under overload, the noise level increases sharply. The hum may become strained, intermittent, or accompanied by a metallic clang.
A frequent cause of loud operation is a faulty start relay. This small element is responsible for starting the compressor engine. If the relay contacts are oxidized or burned, startup may occur with a loud click followed by a buzzing sound. In some cases, the compressor tries to start, hums for a few seconds and turns off.
In models with two compressors (separate for the freezer and refrigerator), only one of them can make noise. To identify the culprit, place your hand on the body of a running motor. If it vibrates more than usual and gets very hot, the problem is localized in this unit.
| Sound type | Probable cause | Required actions |
|---|---|---|
| Strained hum, heating | Compressor overload | Check the thermostat, defrost |
| Loud click and silence | Faulty start relay | Replacing the relay |
| Metallic knock inside | Failure of compressor valves | Replacement of the compressor |
| Intermittent hum | Electrical problems | Diagnostics wiring and relays |
Repairing a compressor at home is practically impossible and economically impractical. In most cases, the entire assembly needs to be replaced. This work should only be entrusted to qualified craftsmen, since the procedure involves working with refrigerants under pressure.
The influence of the defrosting system and fans
In refrigerators with a system No Frost fans are responsible for air circulation. Over time, ice can build up on their blades, causing imbalance and vibration. As a result, the fan begins to hum, crackle, or touch the ice crust. This is one of the common causes of noise in the freezer.
Problems may also arise with the defrost system. If the evaporator heating element is faulty or the defrost timer is not working correctly, too much ice will build up on the evaporator. The fan, trying to force air through the snow-clogged duct, makes a howling sound. Periodic complete defrosting (for 24 hours) often helps eliminate this noise.
☑️ Diagnostics of the No Frost system
It is important to monitor the condition of the door seals. If the rubber does not fit tightly, warm, moist air enters the chamber. This leads to accelerated formation of ice on the evaporator and, as a result, to problems with ventilation and noise.
- ❄️ Ice buildup on the fan blades causes beating and humming.
- 🌪️ Clogged air ducts increase the load on the fan motor.
- 🚪 Loose door pressure accelerates freezing of the system.
- 🔧 The creaking of the fan bushings requires lubrication or replacement.
⚠️ Attention: Do not try to scrape ice from the evaporator with sharp objects. Damage to the evaporator tubes will lead to immediate release of freon and costly repairs.
External factors and operating conditions
Sometimes the reason for the hum lies not inside the equipment, but in the environment. High room temperature causes the refrigerator to work harder. The compressor turns on more often and runs longer, which is perceived as constant noise. The optimal temperature for operating the refrigerator is from +16 to +32 degrees Celsius.
Direct sunlight falling on the body also overheats the unit. If the refrigerator is located next to a stove or radiator, the efficiency of heat transfer decreases, and the motor hums more, trying to compensate for heat loss. Make sure there is space around the appliance for ventilation.
The quality of the power supply also plays a role. Voltage surges or low voltage in the network can cause unstable operation of the electric motor, which is manifested in a change in the tone of the hum. In such cases, it is recommended to use a voltage stabilizer.
When you need to call a technician
There are a number of