Hey guys, I Recently replumbed the entire boiler with new piping, circs , valves, tempering valve and complete feed, xtank, etc. I did remove all the circ relays and replace with a Taco SR-504-4 controller, wired as per instructions ZR-ZR on stat and ZC-ZC (pretty simple). Everything was running great, plenty of hot water,etc. I wanted to do electronics ie: aquastat, burner control, cad, etc, but before I did the burner primary control went bad. After replacing it I noticed upon firing the boiler that the circs were running. One of the tests I did below low setting was I jumped out TT on the stat and checked C1 for power and it was still hot. Is that circuit in the stat faulty? Thanks.