When a residential refrigerator suddenly starts making an unusually loud or disruptive noise, it is typically caused by a mechanical obstruction, an iced-over fan, or a failing motor component. The most common culprit is heavy frost accumulating around the evaporator coils in the freezer, causing the spinning evaporator fan blades to strike the ice sheet and produce a loud buzzing or scraping noise. Other sudden noises include a failing condenser fan motor touching debris or a compressor start relay clicking repeatedly. You can troubleshoot by opening the freezer door; if the noise stops instantly when the door is open, the fan is hitting ice. You can verify that your corrective action is successful when defrosting the freezer or clearing debris restores quiet operation.
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