I have an American Standard Freedom 80 Furnace. The blower blows long after the burner stops and blows cold air. I know the blower should blow for a little while but it does not stop. The burner(s) will relight after it recycles, and heat the house again. I did change the filter, so I know its new and I even cut the juice to the unit to reset the board, but no help. Do I need to replace the (White Rodgers) control board?

Suggestion.

Trace fan wiring. Does it go through a limit switch?