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Thanks CBF. Yeah, they seem to have double checked all the settings (apparently) but I'll get them out again. I've tried to research this to death on the Internet and there is lots of talk about incorrect gas/air mix possibly causing this so I'll mention this (preparing myself for the loud...

Hope someone can help with a problem that is driving me crazy. I recently (6 weeks ago) had a new Remeha Avanta Exclusive 39c condensing boiler fitted, replacing a (very old) boiler that was part of a tank in the loft, hot water cylinder in bedroom cupboard type setup. The problem is a high...