Kris K Scotia , NY August 18, 2014 Shaft on the fan speed control switch of thermador downdraft cooktop had broken Replaced the switch. The most difficult thing was finding the replacement part! Exposing the three lead connections by taking the old switch out was all the preparation that was needed. Wire nuts and electrical tape completed the installation job. Read More... 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes