When I read the subject line I was thinking "Excess Flow Valve" on the propane too but...
THE BLOWER WILL NOT RUN
The first step in the ignition sequence, even before the solenoid valve opens turning the gas on, is the blower First it runs, comes up to speed, sails the sail switch THEN gas is called for.
So, we have one less thing to check, We know it is not a propane issue since propane is never called for.
From the op's descripton it can be only one of two things.
1: The thermostat (This includes the wires that hook it up)
2: The furnace controal board
IF, and I stress IF it turns out to be the control board.
Dinosaur boards make first rate replacements, better in my not very humble opinion than the original, and less than half the cost.
