Hi Mark,
It's one of 2 things. Either the small switch that gets pushed in when you close the door or the timer which can be found under the control panel. The latter would be a more expensive fix, but in either case, pretty easy to replace. This happened to me last month and it was the switch on the door. It cost less than $10 to fix and was easy to access. I hope that was helpful. Good luck!
Manny, August 2006
