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Thanks for the advice, I've actually had the boiler off for over an hour and the same thing happened. I can't quite understand why information inthe instruction manual is so poor although it seems to be a common complaint. Mark

Guys, Stumbled across this site in my search for an answer to my Ferolli boiler (I know it's a poor boiler). Went away for the weekend and came back to hot water but no heat. Instead I get a 'd' displayed for a short while and absolutely nothing. Resetting the boiler does nothing, the boiler...