Just a guess. I've had my Satellite a month or so and had the same problem.
The fan came on and would blow cold air forever.
I had no manual but tried turning the valve in the opposite direction, WoW the furnace fired up, got warm air in abt 1min. Seems the valve had been left in the on position and I had no way of telling. Now it fires up every time and have heat in a min.
Hope ur problem is as simple as mine was.
1986 Satellite T-2153
'07 Ram Quad, Hemi, 20" GoodYears, 3:92axle
'08 Kawasaki Brute Force 750