Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Taco Zone Valve and Control Help

carlg Member Posts: 12
I just installed a Taco Zone Valve controller. I have (2) of the older 3-wire zone valves and 1 of the newer Zone Sentry 4-wire valves. For some reason neither of the 2 older valves will open when used with the zone valve controller. The new 4-wire valve opens and closes perfectly fine. The light on the control says that the valve is open for those 2 zones, but they are not.

The wiring was very simple, 1 on valve to 1 on controller, 2 on valve to 2 on controller, 3 on valve to 3 on controller.

What could I be missing here?



    HVACNUT Member Posts: 4,355
    Are the LED lights off when there's no call for heat? Dip switch set to normal, not reset? Call Taco. They're support is pretty good.
  • carlg
    carlg Member Posts: 12
    Guys, thanks. Put this question on hold a bit. I turned off power and powered back up and I am getting different results.

  • Big Ed_4
    Big Ed_4 Member Posts: 1,829
    I can't remember an three wire taco zone valve ?
    I have enough experience to know , that I dont know it all
    HVACNUT Member Posts: 4,355
    edited June 2017
    > @Big Ed said:
    > I can't remember an three wire taco zone valve ?

    >> ahh, to be young again.
    They're out there. Still used on GEO systems.
    They are slow open and close, heater activated, no springs. 1 & 2 get 24v. and 2 & 3 is the end switch.
  • Joe Mattiello
    Joe Mattiello Member Posts: 626
    edited July 2017
    The traditional heat motor zone valves take approximately 1.5 min to open, and the zone sentry open within a couple seconds. Sounds like they’re wired correctly, so perhaps you need to wait a little longer for the valve to open. Incidentally, they are slow closing too; approx.. 30 sec
    Joe Mattiello
    N. E. Regional Manger, Commercial Products
    Taco Comfort Solutions
    Steve Thompson (Taco)