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    francis499's Avatar
    francis499 Posts: 1, Reputation: 1
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    #1

    Jan 1, 2009, 10:10 AM
    Furnace with smart valve only stays lit for 5 seconds
    Have natural gas hot air furnace with honeywell smart valve SV9520H8067. Unit calls for heat and ignites OK but only stays lit for 5 seconds and goes out. Have had smart valve replaced 5 years ago. Does this sound like another smart valve problem?
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
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    #2

    Jan 1, 2009, 10:26 AM

    Every Smart Valve is a problem. The symptoms you described could likely be a dirty flame sensor. Normally I would suggest pulling it and cleaning it but with a Smart Valve it can be VERY easy to damage the igniter. If that happens then you are SOL.
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