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Ok the e40 seems to be because I've put in excess water, just got the manual. Still no idea on what to do to get hot water, any help?!

Hello all I have a Keston C36 combi (after reading reviews I know they do cause a lot of issues!). It's recently stopped producing hot water for the taps/shower although the central heating still works fine. I tried turning the pressure taps underneath and it did work again for about 30...