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zone valve problems

The system in question has 3 erie zone valves 2 work normal the middle valve opens when the t-stat calls for heat and starts to open the motorized damper and starts the burner for maybe 2 seconds. Then the gas boiler shuts down but the zone valve stays open.I'm confused if the valve was bad why does it start the cycle everytime then shut down?


  • hot_rod
    hot_rod Member Posts: 19,275
    could be the end switch

    inside the valve is bad. The boiler will go off when it reaches temperature, of course.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • kensethwins
    kensethwins Member Posts: 4
    zone valve issues

    Thanks Hotrod
  • Empire_2
    Empire_2 Member Posts: 2,343
    End switch is probably bad.

    There is a micro switch on the valve and they do become corroded and sometimes will not even start the boiler at all.  Change out the power head.  Valve body can stay in place.


    Mike T.
  • kensethwins
    kensethwins Member Posts: 4
    end switch

    Thanks Mike T.
This discussion has been closed.