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Hi Seco, thanks for the speedy reply, When I turn the roomstat down to min, I can hear the motorised valve turn but the boiler stays on. When I down the cyl. stat down to min. the boiler stops firing up. I thought that maybe it was the motorised valve, so linked the Heating Live and the...

Hi, Please forgive any inaccuracies in this description. I recently managed to blow up my programmer, the previous owner of my house had left wires exposed behind the wall plate, I presume they touched and shorted the system. I then stupidly managed to put a 13 amp fuse into the isolating box...