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Hi echo. After much deliberation and testing this is what I did last night and I am pleased to report that all is well - had both CH and HW behaving themselves overnight and this morning. Thank you for your advice and guidance. Really appreciated.

latest on upstairs wiring: I have removed the 3 core that powered the wired thermostat.... which leaves the following collection I can see that the brown to the motorised valve needs to be connected to something - and that i have a red left over that originally powered the thermostat. Still...

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Hi Echo / other experts..... Having followed the above instructions (thank you) i am up and running.... I have one issue however : i am presuming i have 2 valves at the cylinder as per the pic. When the NEST calls for CH - with the system cold, the pump starts and boiler kicks in but then stops...

Echo - you are a star. Thank you for your help. Tomorrow morning my electrics await! No prob with thermostat - cables run from it to the programmer and I inend to replace in the same location. Really appreciate you help. I'll let you know how it goes. Thanks again

Attached also are the Nest wiring diagrams for a generic installation and an S plan system if that helps...... thank you

Hi folks. I have recently moved house. I was informed by the previous owner that the CH had to be left switched on permanently on the ep3002 and was only controllable by the thermostat. Assuming as he had told me that the programmer was faulty, i invested in a Nest system but when i opened up...