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Cheers I suspect you are right and I have moved it across There has been so much fiddling on this installation Im not sure where the start point is. Any idea what the W M H means?

Hi Plumber fitted a replacement Siemens RMH Motorised element for our CH three way vv. On side it has markings W M H and Man and Open What are settings for normal running and what do they mean? Over Xmas CH seems to be on when water needs to be heated, only. Not sure if a)...