I have a kenmore he3 and I have purchased a new control panel because it would not start and I have also cleaned the dryer out thoroughly, neither has fixed the problem. When I start the dryer it starts for 20 seconds, and a flame never starts and the dryer stops. Any suggestions?

Kenmore Elite HE3 Dryer Repair Manual - iFixit (http://www.ifixit.com/Device/Kenmore_Elite_HE3_Dryer)