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    johnmk Posts: 1, Reputation: 1
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    Sep 19, 2010, 02:46 PM
    Trane xl80 draft pressure problem
    Vent fan starts,ignitor dark no flame,shut down. When I apply artificial vacuum on pressure switch during furnace start up, ignitor glows and burner flames. Before I buy new pressure switch what should I try? Don't think vents are blocked.

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