Slightly different system for us - pressurised central heating & instant hot water, BUT if the pressure drops too low on the central heating side then the boiler won't fire for the hot water but will fire for the central heating. The pressure has to get pretty low for the central heating side to fail. Check if all the pressures are where they should be - the central heating pressure will rise when you fire the central heating and this could be enough to allow the hot water side to function hence the behaviour you're seeing.
Cheers
Dave
---------- Post added at 16:22 ---------- Previous post was at 16:19 ----------
Quote:
Originally Posted by Osem
I know it's not the same type of system but I haven't had any pressure issues showing up on the boiler which has the only pressure indicator I can see.
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Well that's me out of ideas!
Cheers
Dave