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    Boiler not firing up after changing from rwb2e to a rwb29

    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...
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