OP stated he has propane and can light the stove.
Hopefully he hasn't frozen
Furnace fan is blowing but no ignition/main flame
So.......
Check battery voltage....furnace fan can run with low voltage but can't blow enough air to move/make up sail switch.
Battery voltage needs to be at least 12.4V DC
IF good battery voltage
Check for obstructions/blockage at intake/exhaust
Check that sail switch moves freely....check for voltage at/thru sail switch contacts and to circuit board (has to go thru high limit switch which is hard to check without removing furnace)
IF good voltage then circuit board is not sending voltage to spark electrode (no clicking)