Thumping Noises From a Refrigerator

It can be alarming to discover that the brand-new refrigerator you just bought -- the one you've dreamed about for years -- produces noises you're not accustomed to hearing from a refrigerator. But hile noises can indicate a malfunction, most that come from modern models are part of its normal operation. For instance, whether your refrigerator is brand new or a bit older, a thumping or knocking noise can be caused by one of several functions of the appliance.

Appliance Construction

  1. You might recall from childhood that the bulky exterior of an old refrigerator belied the cramped space you found inside. Thick refrigerator walls housed voluminous insulation to keep the interior cool. In contrast, new models have more efficient insulation that allows the walls to be thinner, increasing interior capacity. One of the results is that this improved, thinner insulation does not buffer noise as well as the thicker insulation of older models.


  1. Thumping noises can result from the unit's compressor turning on and off, just like an air conditioner. Thumping or gurgling can happen as the liquid refrigerant circulates. Don't forget, too, that the ice maker can drop cubes into the bin one at a time, or many at once. Some fridges have modified compressors with pistons and springs that can knock or rattle if you move the unit while it's compressing. This behavior is normal. If your refrigerator starts making a new noise, or doesn't perform as it should, call for service.