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Johntheo5 'Do you have a LLH (low loss header) or CCTs (close coupled Ts) ??.' Don't know. I can't see anything looking like a llh. ScottishGasMan Thanks for the advice. I'll give it a go this weekend

ScottishGasMan thank you. My initial point was I've been advised to have a rad flow/return differance of 11C. But if the primary is 10C should I be aiming for 5C? Got into the D codes & found the following info. D005= 60C D015 pump speed = 15% D040= 54C D041= 51C Seems the wife changed the temp...

Johntheo5 thank you for your prompt reply. I now realise the condensing boiler has not actually been working efficiently since fitting for 3.5yrs! Lesson learned,,, don't trust tradesmen that owe you a favour.

Hello all, Trying to get the above running efficiently. Boiler fitted to existing system. Installation docs state flow temp=75 Return temp=65 Everything I read says the dt should be 20? So if I try to balance the rads what DT am I working to? I've managed to work out the rad order using...