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

    Mar 5, 2013, 10:29 AM
    Icp furnace troubleshooting
    I have a ICP furnace model FBF075B12A
    My problem is the fan run at all times and won't shut off I was wondering if I need to replace the whole control board which is a honeywell ST9120C 4040 or some other part.
    randaj12's Avatar
    randaj12 Posts: 3, Reputation: 1
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    #2

    Mar 6, 2013, 05:38 PM
    Does the furnace work? Probably not. If it is the main blower you are talking about, it probably is a limit switch. If this is the case, there are a few things that need to be looked at. Limit switch are to keep the furnace from overheating, could be caused from dirty filters, blocked duct, etc.
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