I have a stackable washer and dryer. The dryer quit working suddenly. I turn the dial to the timed drying and press the start button and everytime i press the start button it just buzzes (like its supposed to do at the end of the drying to let you know the clothes are done). The dryer will not start and buzzes no matter what you set it on when the start button is finished. Any thoughts about whats going on and how i go about fixing it? Thanks!