Amana gas dryer wont heat

My Amana dryer would not shut off in auto dry, so I changed the thermostat on the front of the blower housing as advised. Now the dryer wont heat at all. The ignitor comes on but the gas valve does not open up. What do I need to check or change?

The first thing I would do is replace the gas valve coils.

Here are the break down diagrams for the Amana dryer Model LGA60AW

Gene.