The situation when a once quiet and inconspicuous assistant in the kitchen turns into a source of constant irritation is familiar to many owners of household appliances. equipment. Old refrigerator may begin to hum, crackle or vibrate for various reasons, and these signals cannot be ignored, as they may portend a serious breakdown of the compressor or refrigerant circulation system. Often the problem lies not in the fatal wear of the unit, but in a violation of simple operating rules or elementary displacement of parts, which can be easily corrected without calling a technician.
Before taking radical measures such as replacing the motor or buying new equipment, it is worth conducting a thorough diagnosis of the sound source. Vibration can be transmitted to the floor, walls or nearby objects, creating the illusion of a malfunction of the compressor itself. Acoustic comfort in the apartment directly depends on the correct location of the refrigeration cabinet and the condition of its supporting elements, which is often overlooked during the initial installation.
In this article we will analyze in detail the mechanical, technical and operational reasons for noise in aging models of refrigerators. You will learn how to distinguish a normal operating hum from a sign of impending failure, and receive a step-by-step algorithm for reducing the decibel level. Remember that timely maintenance prolongs the life of equipment and saves your nerves.
Primary diagnosis: determine the source of the sound
The first step to solving the problem is to accurately determine the nature and location of the noise. Do not rush to disassemble the unit until you understand what exactly makes the sound: itself compressorcirculating in the tubes freonor the resonating elements of the housing. Place your hand on the side walls and rear grille - if vibration is felt strongly there, the problem most likely lies in the operation of the motor or fasteners.
Often owners confuse the normal sound of refrigerant flow with signs of a malfunction. In older models, especially after defrosting, gurgling or hissing may be heard, which is the normal operating mode of the system No Frost or drip defrosting. However, if this is accompanied by a metallic clanging sound or a growing hum that requires you to raise your voice to talk in the kitchen, you need to look for a mechanical cause.
⚠️ Attention: If you hear a loud click, followed by silence and the motor not starting, or a continuous crackling sound, immediately unplug the appliance. Continuing operation in this mode may lead to combustion of the compressor windings.
For a more accurate diagnosis, you can use a simple exclusion method. Try to lightly press various parts of the housing with your hand while the unit is operating. If the noise subsides when pressed against the door or top cover, then the problem is resonance. If the sound comes from the lower part where the motor is located, and is accompanied by strong vibration of the floor, it is shifted to the shock absorbers or the engine itself.
Installation and alignment: combating vibration
One of the most common reasons why an old refrigerator starts to get very making noise is a violation of the installation geometry. Over time, the legs could become confused, and the floor could become slightly deformed under the weight of the unit, which led to misalignment. Even a minimal tilt causes compressor to work with increased load, transmitting vibration to the entire body and surrounding objects.
Check the horizontal installation using a building level. If you don't have one on hand, you can use a simple door test: open the refrigerator door to a 45-degree angle and let go. If it stays in place or closes itself, the position is incorrect. The door should smoothly return to its original position under the influence of gravity only with a perfectly adjusted horizon.
Adjustment is carried out by twisting or unscrewing the front support legs. On older models, the threads on the legs may be corroded, so be careful not to strip the threads. After leveling, be sure to tighten the locknuts, if they are provided for in the design, so that vibration does not change the settings again.
☑️ Checking the installation of the refrigerator
It is also important to check the distance to the walls and furniture. Older refrigerators often have hotter side walls, and if they touch a cabinet or curtain, this creates additional resonating noise. Vibration isolation requires free space for air circulation and dampening of body vibrations.
Mechanical reasons: fastenings and shock absorption
If everything is in order with the installation, attention should be switched to the internal device. Over long periods of use, the screws and bolts that hold the compressor and other components in place may become loose due to constant vibration. A weakened one fasteners causes the heavy motor to start hitting the metal body or frame, producing a characteristic metallic clang.
Particular attention should be paid to the rubber shock absorbers on which the compressor is suspended. In old refrigerators, the rubber dries out over time, cracks, or completely loses its elasticity. When depreciation ceases to perform its function, the metal suspension begins to contact the metal of the frame, which creates the main noise when starting and running the engine.
⚠️ Attention: Before tightening the bolts or changing shock absorbers, be sure to disconnect the refrigerator from the power supply. Working with live electrical components and moving parts is strictly prohibited.
Replacing shock absorbers is a simple procedure, but requires care. Often it is enough to replace only the rubber bushings, keeping the original metal eyes. If it is impossible to find original spare parts for an old model Indesit, Beko or Atlant you can select universal analogues of a suitable size, slightly modifying them if necessary.
Where to find shock absorbers for an old refrigerator?
Original spare parts for models older than 10 years are often discontinued. Look for universal rubber dampers in auto parts stores (engine vibration mounts) or at radio markets. The main thing is the coincidence of the internal diameter of the hole and the external geometry.
Problems with the compressor and electric motor
The most serious source of noise is itself compressor. If the engine hums smoothly but is too loud, this may indicate normal wear and tear or that it is running at its limit. However, if the hum is intermittent, accompanied by a whistle, or the hum suddenly changes to silence followed by a click, we may be talking about a malfunction of the start relay or a break in the windings.
In older models, the problem of drying out the oil inside the compressor or its insufficient level is often encountered. This leads to increased friction of parts and, as a result, increased noise and overheating. Sealed unit cannot be repaired at home, and if it fails, the entire unit must be replaced.
You can diagnose the condition of the compressor by the temperature of its housing. If it is so hot that it is impossible to touch it, and the refrigerator does not cool or cools poorly, this is a sign of a serious malfunction. Normal operation is accompanied by moderate heating, which does not cause discomfort when touched briefly.
The influence of foreign objects and utensils
Sometimes the reason for banal noise lies not in the technology, but in how it is used. Vibration from a running motor is transmitted to shelves and drawers. If the glass shelf is loose or the plastic container has a crack, they begin to resonate, creating an unpleasant rattling sound, which owners often mistake for a broken refrigerator. refrigerator.
Inspect the internal space. Remove all food, shelves and drawers, and turn on the empty refrigerator. If the noise disappears, then the problem has been found. Bottles often rattle when they touch each other, or poorly closed lids on jars. It is also worth checking the back wall inside the chamber - frozen ice can break off and fall on the plastic parts, creating noise.
Pay special attention to the system No Frost. If the fan in the freezer hits ice or a foreign object (such as a piece of packaging) gets caught in its blades, it will cause a loud crash. In such cases, it is necessary to defrost the refrigerator during the day to remove excess ice.
| Type of noise | Probable cause | Difficulty of eliminating |
|---|---|---|
| Monotonous hum | Normal operation or wear of the compressor | Low (installation check) |
| Metal clanging | Loose motor fasteners | Medium (tool needed) |
| Crackling or creaking | Fan or ice in the system No Frost | Medium (defrosting) |
| Gurgling | Freon circulation (normal) | Not required |
| Strong floor vibration | Incorrect installation of legs | Low (adjustment) |
Prevention and extension of service life
In order for the old refrigerator to continue to delight with silence, it is necessary regularly carry out preventive measures. Cleaning a condenser grille at the back of the refrigerator from dust and animal hair improves heat transfer. When the radiator is clogged, the compressor is forced to work longer and harder, which increases noise and wear.
It is also important to monitor the condition of the rubber seals on the doors. If they do not fit tightly, warm air enters the chamber, causing the unit to turn on more often. Frequent on-off cycles not only increase energy consumption, but also create constant acoustic discomfort.
⚠️ Attention: Do not install the refrigerator near heating appliances or in direct sunlight. Elevated ambient temperatures force the old motor to work at its limit, which inevitably leads to increased noise and rapid breakdown.
Regularly check the condition of the electrical wiring and sockets. Poor contact can cause sparking and humming, which is transmitted to the housing. Use only serviceable extension cords and surge protectors designed for the power of the refrigeration equipment.
In conclusion, it is worth noting that most noise in old refrigerators can be corrected. Replacing rubber shock absorbers under the compressor eliminates up to 80% of problems with vibration and hum in models older than 7 years. Do not rush to throw away the equipment if it is no longer quiet - often a small intervention is enough to return it to comfortable operation.
Why does the refrigerator hum only at night?
At night, the overall noise level in the apartment decreases, and the operation of the refrigerator becomes more noticeable. In addition, at night the voltage in the electrical network may drop, which causes the motor to hum louder due to unstable operation of the windings. Also, at night, other systems of the house (pumps, ventilation) often turn on, creating resonance.
Is it possible to lubricate the compressor so that it makes less noise?
Self-lubrication of the compressor is impossible, since it is a sealed unit. Attempting to drill a hole or disassemble it will result in freon leakage and permanent failure. Only the fan bearings (if they are removable) or the rubbing plastic parts of the shelves are lubricated.
Is it normal for the refrigerator to make a “gurgling” sound?
Yes, this is absolutely normal. The sound of the flowing liquid is made by the refrigerant (freon) moving through the pipes of the system. This is especially audible in models with the No Frost system and immediately after defrosting. If the sound is not accompanied by loss of cold, there is nothing to worry about.
How long should an old refrigerator work before shutting down?
In normal mode, the refrigerator runs for about 20-40 minutes, followed by a pause of 1-2 hours. If the old unit works almost non-stop (the operating cycle is more than 50 minutes), this indicates a violation of the tightness, a freon leak or wear of the compressor, which also affects the noise level.