Roper gas dryer spins but no heat

My roper gas dryer turns on like normal but theres no heat. Gas is from house so that not the problem. It also keeps spinning and doesnt turn off like it used to. Just tumble dry with no heat. Any clues?
ty:confused:

Hi relvis

The complete troubleshooting instructions you can find here: http://forum.appliancepartspros.com/dryer-repair/945-dryer.html

Good luck.
Gene.