A sudden grinding sound in a working refrigerator is always an alarm signal that cannot be ignore. Extraordinary sound indicates that there is a failure in the cooling system or engine mechanics. Ignoring such symptoms often leads to the complete failure of an expensive unit.
The creaking can be caused by many factors: from simple instability of the housing to serious damage to the compressor. It is important not to panic, but to consistently analyze the nature of the sound and its source. Accurate diagnosis at an early stage allows you to eliminate the problem with minimal financial costs.
In this article we will analyze in detail the main causes of metallic friction sounds, methods for identifying them and methods for eliminating them. You will learn in which cases you can handle it yourself, and when it is better to call a technician.
Primary diagnostics and installation check
Before disassembling the unit or calling a technician, it is necessary to exclude external factors. Often the cause of grinding is the wrong installation of the refrigerator. If the case is skewed or the legs are not adjusted, vibration from the operating compressor is transmitted to the walls and amplified, creating a resonating sound.
Check the gap between the back wall of the device and the wall of the room. The minimum distance should be at least 5-7 centimeters. If the condenser tubes touch the wall, they may vibrate and make an unpleasant sound. Also inspect the space around the refrigerator - foreign objects may fall into the vibration zone.
Make sure that there are no objects inside the chambers that may come into contact with walls during vibration. Heavy pots or bottles sitting on the door can also rattle. Rearranging food often helps to identify the source of the noise.
Failures of the compressor and its fastenings
The most serious cause of grinding is wear or compressor failure. This is the heart of the refrigerator, and if motor-compressor works with a grinding noise, this may indicate wear on the piston group or problems with the valves. In this case, the sound is usually accompanied by strong vibration of the housing.
Often the grinding noise does not come from the motor itself, but from its mounts. Rubber shock absorbers dry out and crack over time. The metal parts of the compressor begin to touch the metal frame, producing a characteristic clanging sound. Replacing the bushings is a simple procedure, but it requires care.
⚠️ Attention: If you hear a metallic grinding sound just when the engine starts or stops, this is a sure sign that the shock-absorbing bushings or the compressor itself need to be replaced.
To diagnose this problem, sometimes you need to remove the rear protective panel (if there is one) and visually inspect the condition of the fastenings. However, without experience, it is better not to touch the electrical contacts.
How to check the condition of the bushings without disassembling them?
Gently press with your hand on the running compressor. If the grinding changes in tone or disappears, it means that the vibration is transmitted to the body through worn fastening elements.
Problems with the ventilation system (No Frost)
In refrigerators with a system No Frost fans are responsible for air circulation. Over time, dust, dirt or ice can get into their bearings, which leads to imbalance and grinding noise. The sound usually comes from the freezer.
If the fan is “bitten” by ice, it will rotate with difficulty, making an intermittent crackling or grinding noise. This often happens when the defrost system is faulty. Water flows into the drain, freezes there and blocks the blades. Defrosting the refrigerator for 12-24 hours can temporarily solve the problem.
In some cases, a complete replacement of the fan is required. You can determine this by opening the freezer door: if the sound disappears when you open it (since the fan stops), then the problem is there.
- 🌀 The grinding noise intensifies when the door is closed - a sign of problems with the fan.
- 🌀 The sound is constant and monotonous - wear on the fan motor bearing.
- 🌀 Intermittent crackling - a foreign object getting into the blades.
Wear of bushings and mechanical damage
Mechanical components of the refrigerator require lubrication. If bushings or bearings are left without lubrication for a long time, metal begins to rub against metal. This causes a characteristic squealing and grinding noise, which only intensifies over time.
Particular attention should be paid to the engine rotor bushing, if the compressor design provides for this. In older models, wear of this part is a common cause of noise. Repair in this case may not be economically feasible, and it is easier to replace the entire assembly.
Also check the condition of the tubes coming from the compressor. If they vibrate and touch each other or the housing, this causes a loud metallic grinding sound. Gently bend the tubes by hand (with the device turned off!) to increase the gap.
Sound diagnostic table
For the convenience of classifying problems, we have compiled a table that helps determine the source of noise by its characteristics. This will help you more accurately describe the problem to the technician or understand the essence of the breakdown.
| Sound type | Probable cause | Localization | Urgency of repair |
|---|---|---|---|
| Metal grinding noise at start | Wear of compressor bushings | Bottom, rear wall | Medium |
| Crackling and humming | Fan malfunction | Freezer camera | High |
| Rhythmic knocking | Tubes touching the body | Rear | Low |
| Strong vibration and hum | Case distortion | The entire unit | Low |
When you need to call a technician
Not all problems can be solved on your own. If after checking the installation and defrosting the refrigerator continues to grind, professional diagnostics are required. It is especially dangerous to ignore sounds accompanied by the heating of the motor or the cessation of cooling.
Interference with the refrigerant circulation system without a license and equipment is prohibited. An attempt to replace the compressor yourself can lead to a freon leak and final breakdown of the equipment. Certified master has the necessary tools for evacuation of the system and filling with gas.
☑️ Do you need a master?
In addition, if the unit is under warranty, any independent repair will lead to loss of warranty. In this case, the only correct solution would be to contact an authorized service center.
Noise prevention and equipment durability
To extend the life of the refrigerator and avoid grinding noise, you must follow the operating rules. Regular defrosting (for drip systems) and cleaning the drainage holes prevents the formation of ice jams.
Keep the condenser grid at the back of the refrigerator clean. A grate clogged with dust causes the compressor to work with overload, which accelerates its wear. Wipe the dust with a soft brush every six months.
⚠️ Attention: Do not install the refrigerator close to the wall or in a niche without gaps. Impaired heat exchange leads to overheating of the compressor and increased noise.
Following these simple recommendations will help you avoid expensive repairs and maintain peace in the kitchen. Remember that equipment loves attention and proper care.
Why does the refrigerator grind only at night?
At night, the overall noise level in the apartment decreases, and the sounds of operating equipment become more noticeable. In addition, the voltage in the electrical network may be more stable at night, which affects the operation of the motor. However, if the grinding noise is strong, the problem is not in the time of day, but in the mechanics.
Is it possible to lubricate the compressor yourself?
Modern compressors are sealed units. It is impossible to lubricate their internal parts yourself without breaking the tightness of the system, which will lead to freon leakage. Only external bushings and fasteners are subject to lubrication, if the design allows it.
Is grinding dangerous for food in the refrigerator?
Sound itself does not affect food. However, if the grinding noise is caused by a faulty compressor or fan, the temperature inside the chambers may begin to rise. This will lead to spoilage of perishable products. Monitor the thermometer readings.