Could be stuck relay on control board. If you have an older furnace,
the fan could be controlled by a temp probe inside the duct. It looks
basically like a dial that turns as the temp goes up or down.
Another possibility is your T-stat is defective, Remove the wires from
your T-stat and see if the fan goes off.
On Sun, 28 Dec 2008 18:36:59 -0800 (PST), fzbuilder
Since you've given no full model number and a very generic
explaination it the same as saying this:
I have a Buick. Sometimes in the morning it takes a while to start and
then it keeps sputtering while its running.
What could it be?
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