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

one zone will not start boiler

Jethro789 Member, Email Confirmation Posts: 1
I have a hot water baseboard boiler made by The H.B. Smith company and one of the zones will not start boiler, the zone does open and the boiler makes a click noise but will not fire up. What can cause this issue?


  • kcopp
    kcopp Member Posts: 4,440
    But other zones will? Sounds line a wiring issue. Broken wire on that end switch? Any chance at a pix?
  • BillyO
    BillyO Member Posts: 277
    bad end switch on zone valve
  • unclejohn
    unclejohn Member Posts: 1,833
    Boiler makes a click, maybe bad relay at boiler.
  • mattmia2
    mattmia2 Member Posts: 9,735
    edited March 2020
    the click from the boiler would suggest that we need some pictures to figure out how it is set up. Could be it is firing the boiler when the zone calls but the end switch isn't starting the pump if it is wired that way. The boiler might not be firing when you observe it because it has shut off on high limit because it is not circulating.