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Make sure that there is not a manual limit that has tripped and needs to be reset. Roll out limits, and check primary limit. On some models if a limit is tripped the blower starts to run right away. I don't know if this will fix it. But that is where I would start if I was working on this problem. Then I would check if the combustion blower starts and then if it makes the pressure switch. Then check if the ignitor is sparking or glowing and getting power to it. A good volt meter will help in checking. Good Luck.
have you checked your filter yet? the other thing to check is open the fan door and jumper the door switch,if there is one, and turn the furnace on. is the fan blowing air now?
Installed a new filter and furnace is running great now. The old filter was not that old, but we have been doing some remodeling and I figure that is what clogged it so fast.
You have a dirty flame sensor. Look at the very last burner and you will see a wire going to a ceramic sensor and it looks like a thick wire. Take some steel wool or fine sandpaper and clean the surface off and it will work like a champ.
If you know where the high limit switch is you can always cut the two wires and wire them together causing the limit to close. But what you have to watch out for is why the high limit is not closing. That means in your return air either you have a dirty return air duct, dirty filter, or you don't have all your registors open to allow the heat to escape the heat exchanger. Just watch over riding the system. The high limit switch should either be on or behind the blower, in the middle of the system right under the heat exchanger. any other questions about hvac just ask.
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