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Hi, Thanks for the reply - the original symptons were that the potterton controller had stopped working altogether - i.e. no display, buttons not working and not firing the boiler. the new controller is a drayton Tempus 7. Thanks. Paul

My central heating controller (Potterton EP2002) stopped working yesterday so I set out today to replace it. I bought a compatible alternative (XXX) and have wired it according to the diagram i.e. N L 1 2 3 4 - However there are only two other wires in addition to the neutral and live so the...