An unusual increase in operational sound originating from a microwave oven frequently indicates a malfunction or the presence of a foreign object within the appliance. These sounds can range from a low hum to a high-pitched whine or a distinct crackling noise. For example, a plate with metallic trim can cause arcing, resulting in a loud, sparking sound.
Identifying the source of an atypical auditory emission from a microwave is critical for preventing further damage to the appliance and ensuring user safety. Undiagnosed issues can lead to decreased efficiency, complete appliance failure, or even pose a fire hazard. Historically, addressing these noises early was often left to appliance repair professionals; however, increased accessibility to information allows users to perform preliminary diagnostics.