If you're running on battery only ( no shore power) then your battery voltage may have dropped low enough so the blower isn't running fast enough to activate the furnace safety "sail switch".
The sail switch tells the furnace the blower is running and its ok to light the furnace. If the blower isn't running fast enough, OR, the furnace combustion air intake/exhaust is plugged (bugs), the furnace will not light.
Charge the battery or plug in shore power and see if this solves problem. ALSO - Go outside and Inspect the air intake and exhaust to make sure bugs didn't set up housekeeping inside the vents.
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2001 Coachmen Mirada (Ford F53 6.8L V10) - Toad 2003 Saturn Vue
It won't do MACH 2, but I can get a sandwich and take a pee.
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