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    RSM's Avatar
    RSM Posts: 43, Reputation: 4
    Junior Member
    		  
    #1

    May 6, 2007, 12:35 PM
    Ol furnace pressure release
    What causes the relief valve to open on an oil furnace? Furnace appears to be functioning normally providing heat and hot water. Hot water works off a separate tank with a separate zone heating the water in the tank.

    Thanks,

    RSM
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 6, 2007, 04:24 PM
    Could be the relief valve is defective. Too much water in the boiler. Expansion tank full.
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