I may need to replace the furnace; I really don't know why because it's 'only' 21 years old. Anyway, it's always worked fine but on this trip, it only lights when electricity is available. Unplugged...
The furnace is a Hydro Flame Excaliber 8935DCLP-II. The fan runs fine, no slower/faster than usual. I'm on my way home and am in Pueblo now; no heat needed. I'll rig up some jumpers when I get home on Sunday and start checking for weak connections. Thanks for the advice. Also, just how difficult is it to pull the old unit and install a new one?