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Zone short cycles and t stat reads lower than setting

davidheat Member Posts: 4
I have a Utica gas fired hot water boiler and one of my zones cycles very quickly and then shuts off. The t stat is set at 68 and it reads as 61 actual temperature in the room.

any thoughts as to what I can check to try and correct?


  • Zman
    Zman Member Posts: 7,446
    Alittle more info

    Do you have zone valves or circulators?

    Can you post a picture?

    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Paul48
    Paul48 Member Posts: 4,469

    Eliminate the thermostat by jumping it out, at the thermostat.Beyond that we need the info. There's a couple other possibilities.
  • unclejohn
    unclejohn Member Posts: 1,830

    The heat anticipater setting on the tstat.
  • davidheat
    davidheat Member Posts: 4
    edited January 2013

    I have Taco circulating pumps on each zone with Taco flo-chek valves. I have changed the caps on the flo cheks and that doesn't seem to fix it. Thanks

    Pictures attached.
  • davidheat
    davidheat Member Posts: 4
    Checked t-stat

    I checked the t-stat and the settings were correct, I would appreciate any help I can get. Thanks.
  • John Mills_5
    John Mills_5 Member Posts: 946

    Mechanical or digital? 
  • davidheat
    davidheat Member Posts: 4
    Stat reply

    Hi John it is a Honeywell T87 t stat.
  • RobG
    RobG Member Posts: 1,850
    Zone Pump

    Is the boiler firing up on a call from the t-stat? If so, is it shutting down on high limit? If so, it sounds like your zone pump is not operating or the zone is air bound.

This discussion has been closed.