Whirlpool · Smart Electronic Dryers
A thumping sound is heard from the dryer, particularly if it has not been used for some time. This is considered normal during initial operation.
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Allow the dryer to run for a few minutes; the thumping sound should naturally diminish.
Ensure the dryer drum is not overloaded and items are not balled up, which can sometimes cause similar sounds.
Confirm there are no loose items inside the drum that could be causing the thumping.