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removed that , fitted a new one, also removed the tank stat also removed the zone valve,so onley the pump is working in the system still the same many thanks brian

have an old concord boiler wall mounted C plan 1 boiler, 1 water tank , 1room stat, 1boiler stat 1 inline pump, gravity fed, problem of banging in pipes to loft, and lots of steem to gravity tank, relpaced water pump, replaced hot water tank,replaced water tank stat, replaced zone switch, and...