No light when trying to light is a BIG CLUE.
1) No 12 volt power (fuse or broken wire)
2) High Limit thermostat "popped" (reset)
3) Bad control board (replace)
NOTE: Do not remove the rubber cover! Just gently press the reset button through the rubber disk. It should "click" if it was popped; Don't keep pressing! You could break the thermostat.
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
HAM CALLSIGN - KC3FFW