I have a two stage furnace which is a hot surface igniter type the furnace comes on the exhaust fan comes on and the igniter lights the burners but the fan does not come on and the sytems shuts down

Bad blower motor, capacitor or circuit board, I'm leaning toward a new Trane circuit board.

If you set the tstat to fan /fan only,does the blower work or still not work?, cheapest thing to replace 1st would be the capaciter, just make sure its an exact replacement

Where are these year old questions coming from,,