Ohmeter continuity check of all links in electrical circuit (all thermal pass/fail check low ohms ok; humidity combined with thermal pass/fail on exhaust also checked to have low ohms ok, and flame detector checked low ohms ok and both coils check low ohms ok, ignitor also checked as low ohms ok). But the flame detector and the two coils get the most "abuse" from having current go thru the coils to energize the gas release valves and can fail after being on for a bit of time as they heat up; same for flame detector since it is exposed to combustion flame near ignitor. Replaced both with parts ordered here and replaced (total swap time under 10 minutes; remount panels and back panel leads for total reassemble of 20 minutes and reinstall to gas fitting and checkout in under 30minutes. Heat is ok and unit turns on and off as expected. Considering holiday mail traffic your parts still made delivery under 2-3 days (storm delay). Overall biggest problem was discovering our model dryer requires lower panel to come off first then main from panel comes off 2nd. Video showed one piece panel - wrong for me. Lost most time there. Overall many thanks; right parts, lower prices and dependable delivery.