Michael M Omaha , NE January 09, 2017 Appliance: General Electric Dryer GTDX200EM0WW Ge Dryer Gtdx200em0ww: Couldn't set the dryer timer. How to replace Timer. Replaced the timer knob & timer (it had been erratic) itself. Very easy. Note-square drive screws. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes