check space between inner /outer drum for obstructions , usually a sock . using a inspection light slowly rotate drum whilst looking through drum holes and see if you can see anything .another thing to check is to see if anything is tangled around heating element,to remove element follow these steps= remove wm top locate element ,loosen securing nut ,do not fully remove,gently tap nut,stud inwards to release from back plate .wiggle element whilst pulling ,all will be revealed .good luck.
killerdanny, October 2011