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Thank you Mattie, it was a neutral, connected it and hey presto its firing up. Just did not think it was for anywhere as it barely reaches the terminal. Finally got some heat, thank you Based on the above and your comment that you have no valves Then I'd say the blue is the supply...

Hi it is just the pic they are lit

Still not sure if the blue wire should be connected to somewhere?

It is still not firing the boiler, here is pic of programmer

Sorry wrong photo here is the way it is

Where would the blue been connected?

Here is pic of wiring new pic below

No dont have any motorised valves, the boiler was working fine till changed the programmer then it just would not fire up.

Hi, I have replaced my old Siemens RWB2E programmer to a new RWB29, but after installing the new unit my boiler is now not firing up? The CH & W lights are coming on asking for the boiler but it is not coming on, I had to replace the old back plate with new one that came with new programmer...