Should have read your post better off the top of my head I think ??? these ravens did not use a plate exchanger , but a duo pass ( think that is the correct term ??) heat exc , if you have changed the stat than the hot water side of the heat exc , were the mains water go's through is or may be scaled up , failing that in my view u may have a control board issue ?? there is a bit of a raven fella that comes on here ocasionaslly Slugbabydotcom , think that is his handel ??
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