What would cause my heating zone to overheat room with tstat turned off. could the condensing valve be allowing water to circulate because it is faulty? i have a loop from the boiler that goes thru a plate exchanger where it picks up heat from my outdoor boiler and this wraparound pump runs continously but I don`t see how that could circulate thru the zone with the condensing valve in off position. that loop is just used to maintain nboiler water temp.
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