Elizabeth L Bartlett , TN June 07, 2016 The timer and knob broke We watched the video on this website on how to change out the old timer (the plastic part had broken off and it wouldn't turn). My husband changed it all out in about 15 min. Saved us a lot of money as we didn't have to call a repair man! Read More... Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes Tools: Screwdrivers