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Well, Taking off the old backplate the guy who installed it kindly left the colour coding written in pencil on the wall. You can just see a bit of it in the right hand cut out in the photo. Colours/legend exactly met that for the new backplate, so it's all fitted now. Programing etc. all...

Unfortunately I can't find any information about the EP2001

Excellent thanks for the information.

Anybody any idea what colour wires in my existing backplate do what function please, (HW Off/CH Off/HW On/CH On)? I assume that all I need do is to wire up the new backplate as per existing without the L to 5 link?

Our 20 year programmer has finally given up the ghost, (display missing and CH light on with nothing else functional). I want to replace this with the Siemens RWB29 but assume I will have to fit the new backplate. The photo is the current wiring, and the schematic is the wiring for the RWB29...