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Firstly, apologies for the 'hijack' and the separate posts, comes from being a forum newbie.......... The wiring interchange guide which came with the programmer does show connection details for the EP2001, have followed it but to no avail. As far as the wiring diagrams on the web site, are...

Hi All, Having problems switching from Potterton EP2001 to a Siemens RWB9. Would be grateful if anyone could tell me which terminals (N,L,1,2,3,4) connect to the following; boiler, pump, diverter, frostat, cylinder thermostat. I'm trying to trace back the cables to see what is connected...