worcester 28i keeps losing pressure. dripping very slowly from the blow off and losing pressure. i was told it was the expansion vesel but not sure any help would be great full thnaks
See FAQ on this site and check the filling valve is not leaking and then the EXV.
Worcester boilers in particular have a greater likelyhood of the plate HE leaking to! Search for previous posts about that if its not the EXV or the valve.
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