Ge Gas Cooktop I Have A GE Gas Dryer. The Problem Is The Dryer Runs Continuous And Has No Heat. What Is The Problem?

I have a GE Gas Dryer. The problem is the dryer runs continuous and has no heat. What is the problem? - ge gas cooktop

The timer for the dryer does not move and stays in one position. What are the causes of the dryer does not shut down and no heat? The dryer is about 8 years and GE brand and a gas dryer.