Ronald G Des Plaines , IL November 14, 2015 Appliance: General Electric Gas Dryer DDG7280SBLWW Ge Dryer Ddg7280sblww: The timer switch failed. How to replace Dryer Timer Knob. Replaced timer switch. I could not believe that AppliancePartsPros had this part in stock for a 21 year old dryer, and was able to ship it to me so I received it the next day. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes