Suddenly appeared A loud knock or obsessive humming in the kitchen space can unsettle any person. If your The refrigerator is rattling, this is the first signal that a malfunction has occurred in the operation of the unit that requires immediate attention. Ignoring extraneous sounds can lead to failure of expensive components or complete failure of equipment.
Primary diagnostics allows you to understand whether the problem can be fixed on your own or whether you need to call a specialist. Often the source of sound is not a breakdown, but improper operation or violation of installation conditions. In this article we will examine in detail the mechanics of noise, diagnostic methods and repair algorithms.
It is important to understand that different models make different sounds. For example, Indesit or Atlant may have their own design features of the compressor. However, the principle of vibration occurrence is the same for all types of equipment. Let's look at the main reasons why the refrigerator began to rattle, and how to deal with it.
Diagnostics of the source of extraneous sound
The first thing you need to do before grabbing the tools is to accurately determine the localization of the sound. Refrigerator compartment and the freezer compartment have different acoustics. Put your ear to the back wall, then to the side panels to understand where the hum is coming from.
Often owners confuse operating noise with an alarm signal. Normal bubbling of the refrigerant in the evaporator tubes is a natural process, especially in models with No Frost. However, a metallic clanging, rattling or strong impact noise when starting the engine indicates a problem.
⚠️ Attention: If a loud sound is accompanied by a lack of cold or the appearance of ice, immediately unplug the device from the network to avoid a short circuit.
To accurately determine the nature of the vibration, you can use a simple method: place your hand on body at different points. If vibration is transmitted to the walls or floor, the problem may lie in the transmission of vibrations from the unit itself. If only one of the shelves is rattling, the task is simplified.
Violation of installation and operation rules
The most common reason why the refrigerator rattles during operation lies in a banal violation of installation rules. The unit must stand perfectly level. If the legs are not adjusted, the body warps, which leads to distortion of the internal mechanisms and increased vibration.
Check the distance to the walls. The minimum gap should be 5-10 centimeters. If the equipment is placed close to the furniture, the resonance intensifies and the quiet hum turns into a loud rumble. Also make sure that the floor under the refrigerator is level and can withstand the load.
Often during operation, one of the legs may become unscrewed or, conversely, screwed in too tightly. Use a building level to make adjustments. Modern models often use screw supports, which are easy to turn by hand or with a key.
☑️ Checking the installation of the refrigerator
Another important aspect is the proximity to other devices. If a washing machine or microwave is operating nearby, their vibrations may interfere. In such cases, it is recommended to isolate noise sources or use anti-vibration pads.
Problems with the compressor and motor
The heart of any refrigerator is compressor. It is this that creates the main pressure in the system. If this unit is worn out, it begins to work louder than usual. Old models, especially Soviet-made or ZIL, Minsk, initially have a high noise level, which only grows over time.
One of the common causes of knocking is a faulty starting relay This element is responsible for starting the engine. If the relay contacts are burnt or the mechanism is stuck, a loud click or metallic clang is heard when turned on. Replacing the relay is a simple procedure, accessible even to beginners.
In more complex cases, the compressor piston itself may make noise. If you hear metal knocking on metal, this indicates wear of internal parts or destruction of the engine mount. Outboard compressors use springs that can stretch or burst over time.
Signs of a compressor malfunction
If the motor hums but does not start, and after a few seconds there is a click and it goes silent, this is a sign of a wedge or a faulty starting device. In this case, it is dangerous to continue trying to turn it on.
Modern inverter compressors operate much quieter, but they are not immune to breakdowns. Their noise is more like a high-frequency howl or squeak, which also requires diagnosis. Repair of such components usually requires replacement of the entire unit.
Malfunctions of the ventilation and defrosting system
In refrigerators with a system No Frost fans are responsible for air circulation. If The refrigerator rattles it is in the defrost mode or immediately after closing the door, the problem is most likely in them. The fan blades may touch frozen ice or a foreign object.
Over time, the fan bearings wear out, which leads to humming and rattling. The lubricant in them dries out, and the bushing begins to play. In some cases, cleaning and lubrication helps, but more often a complete replacement of the unit is required.
Icing of the evaporator is another cause of noise. If the melt water drainage system is clogged, the water freezes in the chamber and the fan begins to chop the ice. This creates a characteristic crackling sound. It is necessary to completely defrost the refrigerator (for at least 24 hours) and clean the drainage hole.
| Type of noise | Probable cause | Solution method |
|---|---|---|
| Monotonous hum | Compressor wear | Replacing the motor or sound insulation |
| Crackling and grinding | Fan (No Frost) | Defrosting or replacing the fan |
| Loud click | Start relay | Replacing the relay |
| Gurgling | Freon circulation | Normal (does not require repair) |
Localizing the sound in the upper or lower part of the case will help determine the culprit.
Rattling of internal elements and dishes
Sometimes the answer to the question why the refrigerator rattlesturns out to be banal. Vibration from a running motor is transmitted to all loose objects inside. Glass shelves, plastic containers, bottles can resonate and create a lot of noise.
Check whether the shelves fit tightly to the guides. If the plastic of the guides has dried out or cracked, the shelf will rattle. In such cases, you can place pieces of foam rubber or use special silicone gaskets.
Inspect the rear radiator grille. The thin metal condenser tubes can vibrate and hit each other or the housing. Carefully, trying not to damage the tubes (they are filled with gas!), bend them or secure them with clamps.
It is also worth checking the fastenings of the vegetable drawers. If they are not fully inserted into the grooves, when the case vibrates, they will knock on the walls of the chamber. Take out all the food and carry out an “acoustic check” of the empty refrigerator.
When you need to call a specialist
There are situations when independent repair is impossible or dangerous. If, after checking all external factors and internal elements the refrigerator continues to rattle, and at the same time there is a loss of cooling capacity, you need a professional.
Replacing the compressor requires evacuation of the system, charging with freon and the use of special equipment (burners, pressure gauges). An attempt to do this at home without experience will only lead to damage to the equipment and possible injury.
⚠️ Attention: Opening a sealed refrigerant circuit without a license and equipment is prohibited by environmental standards and technical regulations.
A technician is also needed if the noise is accompanied by a burning smell or melting of the wiring. This may indicate an interturn short circuit in the motor windings, which can lead to a fire. In modern models with electronic control, diagnostics require connecting a tester.
Prevention and extension of service life
So that the question “what to do if the refrigerator rattles” does not arise too often, it is necessary to follow the rules of prevention. Regular defrosting (even for No Frost systems once a year) helps maintain the efficiency of heat transfer and reduces the load on the motor.
Keep the rear condenser grill clean. Dust and animal hair, accumulating there, impair heat transfer. The compressor has to work longer and harder, which increases wear and noise.
Do not overload the refrigerator with food beyond normal limits. This creates excess pressure on the shelves and the compressor. Even distribution of food helps reduce vibration. It is better to place heavy cans closer to the walls of the chambers.
Compressor service life
The average service life of a modern compressor is 10-15 years. However, with constant overload and poor ventilation, this period can be halved.
Use a voltage stabilizer if surges are observed in your network. Sudden changes in voltage can damage the starting relay and motor windings, which will cause not only noise, but also complete breakdown.
Why does a new refrigerator hum loudly?
New equipment may make noise due to shipping bolts that have not been removed, or because it has not yet “got in.” Also, new compressors can operate in run-in mode with increased load. If the noise does not subside after 3-5 days, check the installation.
Is it possible to lubricate the compressor if it hums?
Self-lubrication of the compressor is impossible, since it is a sealed unit. An attempt to drill a hole for oil will lead to freon leakage and failure of the unit. Only fan bearings are lubricated if the design allows for their disassembly.
Is it normal for the refrigerator to gurgle after it is turned off?
Yes, this is absolutely normal. After the compressor stops, the refrigerant continues to flow through the tubes under the influence of gravity and residual pressure, producing the sounds of overflowing liquid. This is not a sign of breakdown.
How to reduce the noise of an old refrigerator?
The most effective way is to install the equipment on a flat floor using anti-vibration pads under the legs. You can also check and tighten all external fasteners, clean the rear grille of dust and make sure that the refrigerator does not touch walls or furniture.
Is knocking when starting the engine dangerous?
A single knock when starting may be the norm for some types of relays. However, if the knocking is repeated in series or the motor hums but does not start, this is a sign of a malfunction of the starting device or jamming of the piston group, which requires repair.