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    csquires Posts: 2, Reputation: 1
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    Nov 4, 2010, 10:59 AM
    Heil Furnace
    My furnace is giving me the code of the red light flashing three times, the book says this means that the pressure switch is stuck closed or the manual switch is in the off position. I have checked the manual switch and it is in the on position so I'm figuring this means the pressure switch is stuck closed. How can I fix this or do I need to call a technichian?

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