Why does my microwave oven make a dull thumping noise during operation?

GE JE1060 Oven ·

A dull thumping noise during operation is normal, particularly when the oven is not operating at High power. This sound is commonly heard during defrosting and is not a sign of a malfunction. It is listed as one of the normal things to expect with the microwave oven.

Source: JE1060 Oven Manual, Page 22

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