Suddenly emerging or increasing noise from refrigeration equipment often becomes an unpleasant surprise that disturbs the peace in the apartment. If the refrigerator began to operate loudly, this can signal both a banal overload and serious technical malfunctions requiring immediate intervention. Ignoring extraneous sounds can lead to accelerated wear of the compressor and expensive repairs.
In this article we will look in detail at why the unit makes a hum, crackling or whistling sound, and what actions the owner needs to take. Understanding the nature of sound is the first step to restoring silence in your kitchen.
It is important to immediately determine the nature of the sound, since the algorithm for further actions depends on this. The hum can be constant or intermittent, quiet or deafening, which indicates different components that have failed.
Main causes of extraneous noise
The most common reason that refrigerator started to work louder than usual is incorrect installation. If the housing is not level, resonance occurs, increasing engine vibration. Also, the source of noise is often objects that accidentally fall on the rear grille of the radiator or in the space between the wall and the body.
Another category of reasons is associated with the natural wear of parts. Over time, shock absorbers lose elasticity, and the refrigerant tubes can move and touch each other. In this case, vibration is transmitted to the entire body, creating a humming effect.
The design features of the model should also be taken into account. For example, two-compressor systems Liebherr or Electrolux can operate louder than their single-compressor counterparts due to double the motor power. However, a sudden change in the usual sound background should always be alarming.
If you notice that noise appeared immediately after installing new equipment, it may be due to the transportation bolts that you forgot to remove. This critical errorleading to rapid failure of the compressor suspension.
Diagnostics by type of sound emitted
Experienced technicians can determine the malfunction even before opening the housing, simply by listening to the nature of the unit's operation. Different types of sounds indicate specific components that require attention.
- 🔊 Monotonous hum: most often indicates problems with the compressor or incorrect installation of the housing.
- 🔨 Loud knocks and blows: indicate that internal tubes or suspension parts are touching the motor when it is running.
- 🌬️ Whistling or hissing: may indicate a freon leak or fan malfunction in No Frost systems.
- ⚡ Crackling and clicking: characteristic of the operation of the thermostat or start relay, but may be a sign of interturn short circuits.
Particular attention should be paid to the sounds that occur when turning on and off. A short-term noise at start-up is acceptable, but if it continues for a long time, it is necessary to check the starting relay.
Is it normal if the refrigerator clicks?
Yes, a single click when turning on or off is the operation of the thermostat. But a series of frequent clicks, after which the motor does not start, indicates a faulty relay or a broken winding.
Problems with the compressor and start relay
The heart of any refrigerator is the compressor. If motor-compressor it is worn out, it begins to work with increased load, emitting a low-frequency hum. Often the cause is drying out of the oil or wear of the internal piston groups.
The starting relay is responsible for starting the engine. If it is faulty, you may hear a distinctive clicking sound, followed by a humming sound and then silence. This means that the motor is trying to start, but cannot gain speed.
In some cases, the cause of the noise is not the motor itself, but its mounting. The rubber washers that hold the compressor harden over time and no longer dampen vibration. Replacing these dampers often solves the problem of loud operation.
⚠️ Attention: Checking the compressor and relay requires working with live electricity. If you do not have the skills of an electrician, do not carry out diagnostics yourself - contact a specialist.
Noise in No Frost systems and fan operation
Refrigerators with the system No Frost are equipped with fans to circulate cold air. Over time, moisture and dust get into the fan bearings, which leads to their drying out and the appearance of a loud hum or crackling noise.
The fan can also make noise if ice has formed on its blades. This occurs when the defrost system malfunctions or the door does not close tightly. Ice interferes with rotation, creating a characteristic friction sound.
For diagnostics, you need to remove the back panel in the freezer. If the fan makes noise when turned by hand or has play, it must be replaced. This is a consumable material that lasts an average of 5-7 years.
Vibration and resonance of the case
Sometimes the unit itself is working fine, but makes a lot of noise due to vibrations. If the refrigerator is close to a wall or furniture, the cabinet may resonate with the frequency of the motor. Check the gaps: they should be at least 5-10 cm on all sides.
Another reason is an uneven floor. Even a slight misalignment leads to the fact that one of the supporting legs does not touch the floor, and the body begins to “shake.” Adjusting the legs helps eliminate this defect.
Also check the internal shelves and containers. If they do not fit tightly in the grooves or there are dishes on them, they may rattle in response to the operation of the compressor. Make sure that bottles and cans do not touch each other or the walls of the chamber.
To eliminate resonance, you can use special anti-vibration pads under the feet. They effectively dampen high-frequency vibrations transmitted from the floor.
☑️ Checking the installation of the refrigerator
Table: Diagnosis of faults by sound
For the convenience of systematizing problems, we have compiled a table that will help you quickly determine the source of noise and the approximate cost of repair.
| Sound type | Probable cause | Difficulty of repair | Required actions |
|---|---|---|---|
| Loud hum | Wear of the compressor or lack of clearance at the wall | Medium | Check the installation, if replacing, call a technician |
| Crackling/Knocking | Touching the tubes, malfunction fan | Low/Medium | Bend the tubes, replace the fan |
| Whistling/Hissing | Freon leak, problem with the valve | High | Urgent call to a technician to find a leak |
| Clicks | Malfunction of the starting relay | Low | Replacement of the relay (you can do it yourself) |
This table is for reference only. An accurate diagnosis can only be made by a specialist after an instrumental check of the operating parameters of the electrical circuit and the pressure in the system.
⚠️ Attention: If you hear the sound of ice breaking inside the chamber, this is normal for drip defrosting systems. But if a cracking noise is heard from outside and is accompanied by a burning smell, immediately unplug the device.
When you need to call a technician
Not all faults can be fixed with your own hands. If, after checking the installation and internal shelves, refrigerator continues to work intermittently and with strong noise, the problem is probably deeper.
An urgent call to a specialist is necessary if:
- 🛑 The compressor hums, but does not start, and after a while a click is heard.
- 🛑 There is a smell of burnt wiring or plastic.
- 🛑 The rear radiator grille remains cold when the engine is running.
- 🛑 Ice has stopped forming in the refrigerator compartment (for drip systems) or food has begun to deteriorate.
Timely contacting a service center will help avoid a complete replacement of the compressor, which is a significant part of the cost of the refrigerator itself. Remember that self-repair of the cooling system requires special equipment and licenses to work with freon.
Is it possible to operate a noisy refrigerator?
For a short time - yes, if it maintains the temperature. But constant noise means working with overload, which reduces the engine’s life by several times.
Prevention and care of the refrigerator
In order refrigeration equipment to serve for a long time and quietly, it is necessary to regularly carry out preventive measures. Cleaning the condenser from dust and animal hair improves heat transfer and reduces the load on the compressor.
Once every six months, check the tightness of the door and the condition of the seal. Loose closure causes the motor to work almost without interruption, which inevitably leads to its overheating and noise.
Also, do not overload the shelves with products. Excessive weight can cause deformation of the inner lining and disruption of the geometry of the doors, which will ultimately lead to the emergence of new sources of noise and vibration.
Why does the refrigerator hum loudly immediately after turning on?
Humming in the first minutes of operation is a normal process for the compressor to enter operating mode. However, if the sound does not subside after 10-15 minutes or is accompanied by vibration of the floor, check that the installation is horizontal and that the tubes are not in contact with the housing.
Is it possible to lubricate the compressor if it hums?
Modern compressors are made in a sealed housing. Self-lubrication is impossible without breaking the seal and losing freon. If the compressor is humming due to mechanical wear, it can only be replaced with a new one.
Does the temperature in the room affect the noise of the refrigerator?
Yes, in a hot room the refrigerator works harder to maintain the set temperature. This increases the load on the motor and can increase noise. Try not to place the refrigerator near heat sources (stoves, radiators).