To begin with, the chances of a new refrigerator breaking down are extremely slim. Pay particular attention to how the new appliances are installed: are their gaps on the sides and back of the refrigerator on the wall side, have you aligned the legs so that the refrigerator stands steadily.
Is everything in order? Then with a high probability, the sounds you were alerted to are a variant of the norm, and that is just the way your new refrigerator works. For instance, often owners of “regular” refrigerators (with drip defrost in the fridge compartment and manual defrost in the freezer) are surprised after buying a model with No Frost that the refrigerator makes noise when the motor rests. In fact, they hear the operation of the defrost system. In addition, No Frost models have a fan that blows air from the freezer into the fridge compartment, it also creates additional noise.
Another common option: the old model of the refrigerator has been replaced with a modern one, and the sounds of the compressor motor cause suspicion. Often such users say that the refrigerator sings as if it has cricket in it. Indeed, new motors sound different. But this is their normal operation, and there is no reason to worry.
As a rule, after a week or two, all householders get used to the sounds from the new refrigerator and do not pay attention to a little noise.
Pay attention! During the first day of operation, the fridge may sound louder than it will be later on. The fact is that the technique is gaining cold. As a consequence, the motor works with small stops, you can hear the crackling of plastic from cooling. As soon as the technique gains the set temperature, the sounds will become quieter.
Perhaps the only, but a very rare variant, when a new refrigerator makes noise due to malfunction – during transportation one of the buffer springs, on which the rotor of the motor-compressor is held, has come off. The refrigerator with this malfunction makes a loud knocking noise when the motor works. Repair in such a case is complicated: it will be necessary to open the compressor or replace it with a new one. But since we are talking about new appliances, the most logical thing would be to contact the seller to exchange the refrigerator or to a warranty repair shop to repair or replace the compressor.