Gas Dryer Won't Heat

I bought a whirlpool gas dryer a little over a year ago and it will not heat. This happened to my previous dryer and I ended up replacing it with the whirlpool. I looked online and saw that the common problems are the thermal fuze, ignitor, and clogged duct. I have cleaned out all of the lint, replaced the thermal fuze, and the ignitor and it still does not heat. Do you know what else the problem might be? Thanks.

The gas valve probably needs a new coil kit.