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Hi, not done much on these before, just wondered if anyone had experienced the same problems. Boiler is giving luke warm dhw and poor performane on ch. Pump, fan, aps, sensors appear fine but the flame is modulating almost on/off constantly, the flame doesnt actually disappear but you can see...

Thanks very much Micky & Tony, have also suggested fitting a PRV as they have pretty good pressure which will have compounded the problem, thanks

it is grey the flow sensor

cheers tony, replaced oring and greased and have tried wrapping a few wraps of ptfe without joy, weird as there doesnt appear to be any obvious crack on either part unless one is for some reason distorted

Hi I have the very same problem, have changed o'ring and made no difference still leaks between flow sensor and hydroblock. can only think to replace block but dont want to really, pricey ... Did you have any joy

Would agree with last comment, not an easy one. We have had a similar thing in the past on these boilers where it has shown f12 but has actually masked a dhw plate to plate exchanger fault, expensive because the changing of the user interface (display) board proved to be not needed but was...

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