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Stem, rogue wiring went to Ls and Lr in the boiler, but wasnt wired correctly at teh programmer. So I followed the wiring diagram you gave me and ignored the spare wire. Everything works as it should. Thanks a lot.

That looks a lot closer. As you say, I have two wires from the boiler to the programmer which are unknown to me as to their use/ purpose. One will be the connection to Lr the other .............who knows. Could I connect both to terminal three?? Can I put a meter across the wires...

Stem, Thanks for your reply, let me clarify what I know, relative to your diagram. The link between L and terminal one in the programmer is missing, the Worcester instructions seem to suggest it should be in certain applications but I'm unsure as to my installation requiring it or not...

Hi I have a Worcester Greenstar 28i Junior boiler, Drayton LP111 and a Drayton RTS8 room stat. Water is on the combo boiler and is fine. Heating is the issue. Wiring is as follows:- from fused switch there is a live neutral and earth into their normal positions. There's also a live and return...