Discuss sequence of how the electrics of a s plan Work in order from the programmer in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Something like that. We have to memorise the wiring diagram for a s plan system.
get your books out, have a look at the diagram in there, memorise it then draw it out a few times fm memory, do it enough and you'll never have to ask on here again.
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