Furnace running with thermostat off



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.
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When mine did that a year ago, it was a bad thermostat. It thought it was cooler than what it read. They replaced it and it's been fine ever since. The whole unit was only 3 yrs old. Kathy
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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? Bubba
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wrote:

Fuel line clog, or dirty air filter
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