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Furnace won't kick on

Upon starting my intertherm furnace for the first time the fan runs but won't ignite ,the indicator light flashes twice,indicating a "open pressure switch".What does this mean? and how do I rectify?

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Downstream of your fan discharge there is a little plastic assy. most likely that will have a pickup tube and a piece of vinyl or latex tubing attached. First check to make sure that the pick up tube and/or tubing does not have a restriction. If it is clean use an ohm meter to read resistance across the switch to verify it is operating.

Posted on Nov 15, 2008

  • Richard Jacobs
    Richard Jacobs Nov 04, 2012

    I'm having the same problem. I noticed that the plastic tube inside the furnace cabinet has water in it. Is this normal, or do I need to clear it? It's built kinda like a drain trap, so it seems like it would always hold some water in it. If it is supposed to be clear, how can I clear it?

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My gas furnace wont kick on when it has been off for awile, we have replaced the thermostate and checked eveything else. Once we gett it going it works but wont kick in once the temp drops

Posted on Nov 30, 2008

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