are boiler is the ace high version it is holding pressure when it is not in operation. But when we put the heating on it starts losing pressure through the blow off with a tiny drip. I,v already changed the pressure relief valve and that dint work so could do with a little help please
does that mean it is getting up to 3 bar when warm and passing through prv??? if so it is over expansion, blockage to expansion vessel or no air in expansion vessel
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