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First ever post so be kind, as the title says, Randall 102 wired 1dhw, 2htg, 3com, 4earth, 5N,6L, this is looped at 3-6 Drayton lp722 My understanding is that N is N, L is L, 1- com, 2 is blank, 3 dhw, 4 htg, I've tried looping and not looping the loop between L and 1, I have heating and...