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Thanks for your help, I think it's time to call the phone number of the installer.

OK, thanks. Boiler is a Potterton Promax System 24 HE Plus.

Expansion vessel? It's a MEGAflow, I don't believe there is one. No apparent leaks or overflow.

Apologies for the thread bump, but it seemed sensible as I have an identical or at least similar system. My MEGAflo install can be seen in the linked picture: http://www.pbase.com/jaffacake/image/61080361 We moved in during the early summer 2006 and the hot water worked just fine. In...