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sorry for the long delay but the outcome was a synchron motor fault. thanks to all of you who replied

i havnt checked that yet will try it next. thanks

ok thanks all for the help so far. To give more info the system works fine on hot water only fires up pump and boiler and runs fine. In my process of elimination I disconected all the wires to the room stat ,common, call, satisfied, and eath and temporarily put them in a chocolate block...

Hi I have been trying to resolve a problem with the 3 amp fuse blowing when i switch the programmer to heating only.The system is a y plan and at first I thought there was a wiring problem so I sourced all the cables identified them and made sure it was wired correctly. As i knew the...