A sudden extraneous sound from a working refrigerator is always a cause for concern, because the safety of food depends on the stability of the operation of this unit. If the refrigerator began to rumble, this signal cannot be ignored, since mechanical noise often hides serious malfunctions of the compressor or defrost system. In contrast to the usual monotonous hum, sharp knocks, rattling or rolling of liquid masses require immediate attention and diagnosis.
The first thing you need to do when you hear alarming sounds is to determine the nature of the noise and its location. Often the problem lies not in a breakdown, but in a violation of installation or operating rules, which can be easily corrected with your own hands without calling a technician. However, if the unit makes sounds hammer or metal grinding, this may indicate a failure of internal components.
In this article we will look in detail why compressor or other elements begin to make noise, how to distinguish a normal operating sound from a sign of breakdown and what steps to take to resolve the problem. A correct and timely reaction will help extend the life of the equipment and avoid costly repairs.
Primary diagnosis: distinguishing normal from pathology
Before you panic, it is worth remembering that modern refrigerators, especially models with the system No Frostmake a whole range of sounds during operation. A quiet hum of a running motor, periodic gurgling of the refrigerant and clicks of the thermostat are considered normal. If the refrigerator began to rattle is unusually loud, conduct an initial inspection.
Pay attention to the frequency of the noise. If rattling occurs only when the motor is turned on or off, this may be a feature of the start relay. But if the sound becomes a constant companion or increases over time, you need to look for the source of the vibration. Often the cause is the compressorcompressor itself, which, due to wear or broken fastenings, begins to vibrate against the housing.
⚠️ Attention: If a burning smell or smoke is added to the rattling, immediately disconnect the device from the power supply. Operation of such equipment is a fire hazard.
Check whether the unit is level. The distortion of the housing leads to the fact that vibration from operating components is transmitted to the floor and walls, increasing significantly. Also inspect the back wall: perhaps there are foreign objects pressed against the condenser grille or tubes, which begin to rattle due to vibration.
Installation problems and external factors
One of the most common reasons why the refrigerator began to rattleis a banal violation of installation rules. Vibration is the main enemy of silence, and if the unit is unstable, it turns into a resonator. Check the legs: they should fit snugly to the floor, ensuring a horizontal position of the body.
Often, rattling is caused by objects located in the immediate vicinity or inside the chamber. Dishes touching each other or the walls can create a metallic sound. It is also worth checking whether the pipes from behind are touching the wall or furniture, since when the motor is running they can rhythmically knock on obstacles.
To eliminate external causes of noise, follow these steps:
- 🔧 Adjust the height of the legs, achieving a stable position without rocking.
- 📏 Move the refrigerator away from the wall at least by 5-10 cm to prevent contact of pipes with surfaces.
- 🍽️ Check the contents of the shelves and remove objects that may rattle from vibration.
If after these manipulations the refrigerator began to rattle with the same force, then the problem lies deeper, inside the technical part of the device. In this case, external factors can be eliminated and we can proceed to diagnosing the internal components.
Faults in the compressor and starting relay
The heart of the refrigerator is compressor. It is he who is responsible for the circulation of the refrigerant, and any disturbances in its operation are accompanied by characteristic sounds. If the unit begins to make sounds reminiscent of a tractor or a metallic clanging, most likely there is a problem in the motor-compressor or its wiring.
A common cause of rattling is wear of the internal parts of the compressor or failure start relay. The relay is responsible for starting the engine, and if its contacts are burnt or the mechanism is jammed, a loud click will be heard when you try to start, followed by a buzzing or crackling sound. In some cases, the motor may hum, but not start, which leads to overheating and emergency shutdown.
It is also worth paying attention to the compressor mounting bolts. Over time, due to constant vibration, they can weaken, and then compressor begins to hit the metal case or frame. This creates a strong metallic rumble, which can easily be confused with a serious breakdown.
| Type of sound | Probable cause | Difficulty of repair |
|---|---|---|
| Loud metallic knocking when startup | Faulty start relay | Low (part replacement) |
| Constant hum with body vibration | Loose compressor | Low (tightening bolts) |
| Rhythmic clanging inside the engine | Wear of the piston group | High (compressor replacement) |
| Crackling and lack of starting | Seizing compressor | High (replacement of unit) |
If you find that compressor it gets very hot and makes strange sounds, it is better not to risk it and contact a specialist. Replacing the motor yourself requires special equipment for refilling with freon.
How to check the start relay?
Remove the back cover, disconnect the wires from the relay and gently shake it. If a ringing sound is heard inside (as if from a broken stone), then the part is faulty and requires replacement.
Noise of the defrost system and No Frost fan
In refrigerators with the system No Frost the fan is responsible for circulating cold air. If the refrigerator began to rattle it is in models of this type, this particular node is suspected first of all. The fan blades may become coated with ice or a foreign object may get on them, which causes cracking and beating.
The defrosting system may also be a source of noise. When the heating element is heated, the ice melts and drops of water fall on the hot surface, causing hissing. This is fine. But if you hear the crackling sound of breaking ice or a buzzing sound that appears and disappears, the drainage may have frozen or the defrost timer has failed.
Signs of problems with the system No Frost:
- ❄️ Cracking and grinding noises that get worse with time of operation.
- 💨 A buzzing sound that stops when the door is opened (the fan stops).
- 🧊 Ice formation on the back wall of the chamber.
To eliminate fan noise, it is often enough to defrost the refrigerator for a day. If ice is frozen on the blades, the sound should disappear after complete defrosting and drying. If the problem is the wear of the fan motor bearing, it will need to be replaced.
⚠️ Attention: Do not try to forcibly tear off the ice from the fan blades with a knife or sharp objects. This can damage the plastic and disrupt the balancing.
Rattling of tubes and condenser
The source of annoying ringing is often the copper tubes through which the refrigerant circulates, or the condenser grille located at the rear. During operation, due to vibration or careless transportation, these elements may shift and begin to come into contact with each other or with the walls of the cabinet.
When the refrigerator began to rattle metallic ringing, carefully, trying not to damage the thin tubes, check the gaps between the parts on the rear panel. The tubes should not touch each other, the refrigerator body or the compressor. Even the slightest touch when the motor is running turns into a loud rattling sound.
To fix the problem, you can carefully bend the tubes by hand (only if they are warm or cold, but not hot!) or lay insulating material between them, for example, a piece of foam rubber or rubber. The main thing is to provide a gap that will stop the contact of vibrating surfaces.
☑️ Diagnostics of tubes and condenser
When you need to call a technician
Not all causes of noise can be eliminated independently. If after taking all preventive measures the refrigerator began to rattle it becomes even worse, or new symptoms appear, you cannot do without professional help. There are situations when delay can lead to complete breakdown of the unit.
Call a technician urgently if:
- 🛑 The compressor hums, but does not start, and after a while a shutdown click is heard.
- 🔥 The motor-compressor is heating up to a temperature at which it is impossible to touch it.
- 💧 Traces of oil have appeared under the refrigerator or on the floor around the compressor.
- 📉 Food has stopped freezing, despite the motor running.
Professional diagnostics will allow you to accurately determine whether replacement compressor, freon refilling or control system repair is needed. Attempts to independently disassemble a sealed circuit or replace a motor without skills and tools often end in the final failure of the equipment.
Noise prevention and equipment care
In order refrigerator to work quietly and for a long time, it is important not only to respond correctly to breakdowns, but also to regularly carry out preventive maintenance. Cleaning the condenser grill from dust and animal hair improves heat transfer and reduces the load on the compressor, which has a positive effect on the noise level.
Make sure that the food inside does not touch the back wall of the chamber, especially in the model