Gas Dryer Won't Heat

I have an Admiral Gas Dryer that is about 6 years old…it just stopped getting hot…my husband has already replaced the heat sensor, coils, and Gas Ignitor and it still is not heating up? Any suggestions on what else may be wrong or what we can check…I don’t have the Model # available at this moment but the gas ignitor part number we just received from this site was AP3094138 (WPL 279311)…

Thanks for your anticipated help…