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Help Needed with Zone Valves

DMSH Member Posts: 3
Hi All,

I woke this morning with no heat, when checking system I found the boiler is firing when the thermostat is on, but the zone valve is not opening.

I would suspect a faulty motor, but all four valves failing on the same day seems unlikely.

Any suggestions or thoughts on this???


  • EzzyT
    EzzyT Member Posts: 1,202
    Are the zone valves wired into a zone control panel or off a transformer?
  • DMSH
    DMSH Member Posts: 3
    I believe it is into a transformer... Could it the relay be an issue?
  • EzzyT
    EzzyT Member Posts: 1,202
    It’s most likely that not all zone valves have failed at the same time, I would check to see if your getting power going into the transformer 120 volts and 24 volts leaving the transformer. If the transformer checks out then I’d check the wiring leaving the transformer that’s wired into the motor side of the zone valves.
    rick in Alaska
  • Erin Holohan Haskell
    Erin Holohan Haskell Member, Moderator, Administrator Posts: 1,866
    @DMSH, welcome! We've merged this thread with your other one since it was a double post.
  • DMSH
    DMSH Member Posts: 3
    @EzzyT Thank you! It was a bad transformer, after replacing everything functioning correctly.
  • EricPeterson
    EricPeterson Member Posts: 101
    Transformers are typically quite reliable - so you might want to look into why it failed.