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I finally got that from the internet... There's a 100 quid for anyone who can show me where the manual says the curve needs upping or what the curve does. Thanks for all the help and lovely comments.

So you haven't read the manual but you know the answer's in there? You are in a hurry to go to bed but not hurried enough to post a comment here, telling me to read a manual, which you know has the answer to my question without having read it yourself? What does your boiler 'being better' have...

[/url] I have, actually. Care to point out how?

Hi, I'm not a heating professional. I'm only a poor homeowner who moved into his new house to discover that it is inhabited by a monster called Vaillant vrc 400. First, there was something called a 'BMU error', then FP75. Very intimidating. A service call later from someone suggested by...