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Temp does not respond to thermostat

docjone5
docjone5 Member Posts: 44
I have 6 heat zones and 1 zone no matter what I set the thermostat to is always at 73 to 75 degrees. I have changed the thermostat batteries with no luck and have changed the actual thermostat with one from another zone with no luck either. Any ideas of why this would happen?

Comments

  • Ironman
    Ironman Member Posts: 7,119
    How about a little bit more description as to what kind of heating system you have? Is it hydronic? If so, are zones controlled by circulators or zone valves?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • docjone5
    docjone5 Member Posts: 44
    Hello it is a hydronic heating system the zones are controlled by grundfos pumps, which I believe would make them circulators.
  • Ironman
    Ironman Member Posts: 7,119
    Check valve not fully closing.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • wogpa67
    wogpa67 Member Posts: 238
    ^
    x2
  • docjone5
    docjone5 Member Posts: 44
    So the check valve in the grundfos correct? Are those replaceable? I had one apart looks pretty simple
  • Paul48
    Paul48 Member Posts: 4,469
    Are the pipes to that zone staying hot all the time?
  • docjone5
    docjone5 Member Posts: 44
    Yes pipes are hot seems like all the time
  • Ironman
    Ironman Member Posts: 7,119
    docjone5 said:

    So the check valve in the grundfos correct? Are those replaceable? I had one apart looks pretty simple

    They pull out from the flange side.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.