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Confused again. If the check valves are placed after the circulators what stops the hot water from passing through them? Does the pressure from the circulators allow flow through the check valve, but stops water from passing into the zone when it is not being actuated?

Thats great thanks for the info. Where should i locate the check valve(s)? Before or after the circulators? Im not sure why my plumber at the time did not do this. Could there be a rreason?

Im not sure if i do or do not have a check valve? I have a 1 1/2" pipe coming out of the top of my boiler passed the low water cutoff through the airtrol and into the manifold dividing the circulators. The circulators work for each individual zone when the thermostats activate them. So thats...

I have circulators. Keep in mind that all of the zones are getting hot. The circulators are not running when this happens. I tested circulators. No power from relay when this is happening. I labeled every wire when I replaced the board after the lightning strike so I'm almost positive that...

I have 5 zones in my house and now that it is spring none of them are calling for heat except for my hot water superstore. Unfortunately the hot water is passing into the other zones. I did have to replace my taco relay last year due to a lighting strike. Any help?