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Thanks for the response everybody. The demand light doesnt come on at all. Ive no electrical/plumbing background, all Ive tried to do is what I have picked up over the three years of owning this hugely unreliable boiler (!) so havent swapped sensors in case I broke anything but I will...

Hi The DHW on my Ferroli 102 does not work independently of the CH. The LED does not light and no ho water is pruduced at any temperature. Hot water is produced, however, if I start up the CH via override or if the CH happens to be on anyway. Once the CH is truned off, then my DHW...