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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