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    jasuboy64's Avatar
    jasuboy64 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 21, 2008, 12:05 PM
    cycle on, cycle off
    I have a gas boiler(crown, aruba X3 unit) I am trying to determine if my S86F circuit board is gone; or my air pressure switch is gone. The unit will start up and go real strong for about 8to10 minutes, and then it switch off gas burner and on the burner again; it will do this for some time and hold on run; then kick out again, and eventually shut off. It heats fine; but what the blazeses is wrong? The unit is 20 years old, the S86F board has never been changed, the air pressure switch has.:confused:
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 21, 2008, 12:21 PM
    Is a control sensor telling the boiler to shut off. IE hi limit or water temp control?
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