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

    Dec 18, 2008, 08:07 PM
    3 flashes- no heat
    I have a concord forced air furnace and it`s giving 3 flashes which means pressure switch or auxiliary limit stuck open, any idea how to fix this problem??
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #2

    Dec 18, 2008, 08:13 PM

    First step would be to determine which device is causing the fault. A multimeter would be very useful for this. Don't have one? Check flue vent for blockage or water accumulation for starters.
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