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    Drmrtn79's Avatar
    Drmrtn79 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Mar 21, 2007, 01:31 PM
    GM Delco Heat Boiler Unit
    I have a old GM Delco Heat Boiler Furnace in my house, and it builds up excessive pressure, and then releases it. This happens repeatedly.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Mar 21, 2007, 07:09 PM
    Burner not turning off on the control. Change to lower temp setting. Check for defective control.

    Plugged expansion or full tank. Drain tank and refill boiler.

    Defective pop off valve (safety control ) replace if unit is running at correct pressure and valves opens.

    It is past its prime. You may want to consider getting a more efficient unit.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #3

    Mar 21, 2007, 07:17 PM
    Pressure cold? Pressure hot? Could be a pressure reducing valve or expansion tank problem. Might want to get a pro.
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