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Regardless of the model, the unit will make noise when running because it contains moving parts. The motor with the crankshaft rotates, the connecting rod with the compressor piston makes reciprocating movements, and the valves knock when they are triggered.   The volume increases in models equipped with the No Frost system due to the operation of the fans. Owners usually get so used to the sounds made by a normally working refrigeration unit that they do not notice them. But if it begins to remind of itself too noisily, it is necessary to understand why the refrigerator hums.   The maximum noise level produced by the refrigerator is limited by GOST to 55 decibels. That corresponds to the volume of a normal conversation. Manufacturers of modern units assure that they have reduced this value to 40 dB. When buying, you should read the contents of the label on the front. The top line shows the energy class, then the volume of the chambers, and at the very bottom the noise level in dB.   Incorrectly installed refrigerator   If your new refrigerator makes an obscenely loud noise, it means that it was not vertically and horizontally checked during installation. Therefore, the compressor shifts and starts to hit the tubes or metal elements of the case, making a grinding sound. A more melodious sound is produced when the case vibrates when one foot does not touch the floor.   To fix the problem, you need to use a water level to align the refrigerator vertically and horizontally. A simple string and a weight may be used instead of a compass. Then be sure to check newly how the feet stand on the floor and, if necessary, adjust their position so that the refrigerator does not swing.   How a faulty refrigerator makes noise   A simpler way to describe the set of sounds that should alert an attentive refrigerator owner:   – A low-frequency humming sound with a transition to vibration; – Appearance of clanging noises, clattering sounds reminding the strong ticking of clocks; – sudden intensification of whistling in the circulation system; – Very loud clicks of the starting relay.   The refrigerator compressor makes an unusually loud noise when there is an obvious overload or wear and tear, which may be related to refrigerant leakage. At the same malfunction may appear characteristic whistling in the capillary system – this rarefied freon moves very quickly through the tubes. This malfunction is accompanied by frequent unit start-ups – start-up relay clicks.   Insufficient air supply   A good condenser cooling is required for the proper operation of the refrigerator and this is assured by an inflow of cool air. If the unit is pressed against a wall with furniture on either side, the air intake is insufficient to provide cooling. In such conditions, the load on the compressor increases and it starts humming loudly.   To eliminate the noise, it is enough to increase the distance to the wall to at least 20 cm, and move the furniture away from the side walls. If possible, it is desirable to increase the clearance between the bottom of the unit and the floor. Dust accumulated on the cooling grid interferes with cooling operation, so it should be removed periodically.   Situations in which extraneous noises occur   Noise when turning on the refrigerator is not considered a serious problem – its cause is usually the starting current required to start the compressor rotor. But if the extraneous rattling noise also occurs when the refrigerator is turned off, there is a possibility that the refrigerant tubes are touching the casing or frame. You can reduce or completely eliminate the noise by locating the place of contact and fixing the problem manually.   The refrigerator can be noisy and humming nonstop due to compressor wear and tear – play, piston or piston ring abrasion. No model is immune to this humming noise. If the parts are badly worn, engine decompression occurs. At that, except for extraneous sounds, an increase in the engine’s running time is noted. The problem should be solved by repairing or replacing the engine.   Among other basic situations, the following can be distinguished:   The equipment makes a lot of noise not only at the beginning of work but also when turning off – the reason may be the weakened shock absorbers of the compressor. Because of this, the vibration of the motor becomes more noticeable, and the noise is stronger exactly when stopping. The noise should be reduced by adjusting the shock absorbers.   If the noise has appeared in the new refrigerator, the reason can be the most prosaic – shipping bolts are not removed from the compressor.   The equipment begins to shake and hum after you moved or installed it in a new place, it is worth checking its position on the floor. The equipment may need to be adjusted.   Abnormal sounds are heard after closing the door, – in the refrigerator loaded a lot of food, so the motor begins to reduce the temperature to a predetermined level. The same reason for the sounds appearing after defrosting of any model.   A noise that appears after the freon is loaded can be an indication of excessive refrigerant loading.   It’s time to call for professional appliance repair in San Diego county. San Diego Appliance Repair Service is here to help with professional and experienced appliance repairs.   contact us   (619) 719-5005   [email protected]