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Hi Stem, I had thought that but previous illustration in manual seemed to suggest link to L1. Following your advice I have switched system on and all working well with CH and DHW controls. Many thanks for your quick feedback BW G

Hi I'm installing the components for an S plan system, all now in place. I have a query over wiring of LP722... N L 1 2 3 4 N & L from 3 Amp fused spur To cylinder...