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2 Zone Taco Heating don't heat at the same time.

Hello - I am having a problem with my heating system. I have two zones and when one of the zones is heating up the other stops and vice-versa. Even though both thermostats say "heating" and both pumps are hot. We just installed the system 6 months ago and this is our first winter firing it. Not sure if the problem sits with the system, electric box (Taco) or thermostats. Thanks


  • Canucker
    Canucker Member Posts: 693
    Could be a few things. Can you get some pics of your current set up?
    You can have it good, fast or cheap. Pick two
  • ch4man
    ch4man Member Posts: 246
    i wonder if the zone board, SR502? is controlling the circulators with one set to priority by mistake
  • red1
    red1 Member Posts: 2
    I think it was the zone board. I opened it to find that there was a switch to control the zone priority. I turned it off and now the zones are firing independently. Yes it is a SR502. Thank you for taking the time to comment.