Product review (5 stars): Easy to replace once you figure out how to get to it
Worked perfectly on my GEQ9800PW2 Whirlpool dryer.

If yours is broken, just buy it.  I took apart the old one and it was broken inside.  It is designed such that there will be a dirty component or something stuck.  No lint or dust got into the old one.

Some notes for my model:
The switch plug has clips on both sides.  Be sure to unplug the dryer!
You will need a 1/4" socket or wrench, a Phillips head screw driver and maybe a flat head to help pry the connector apart.
Remove 4 screws in the back of the dryer behind the control deck (they run the length of the deck).
Lift the back of the top so it clears the dryer box and then slide the top forward (There is a heavy metal bracket on the front the top slides into).
Once it clears the clips, just set the top down diagonally across the dryer box and go to work.