t-stat should close the time delay relay in the furnace that will start the blower to develop air flow prior to the propane ignition sequence.
Sounds like the relay may be stuck open.. tap around tne back side of the unit might get it to close..
I had a problem with this relay stuck closed and the blower never turned off..
Also the power for this relay does not go thru the furnace fuse.. mine actually went thru the "REF" fuse. pulling this fuse got my blower to finally stop. look at all your fuses..
Rich + Lori -2006 salem 27BHSS/2004 Avalanche
4:10 rearend - Roxy the puppy when allowed.
41 Days camped in 2011 and counting.