Ok thanks. That doesn’t agtee with the link you provided, I’ll give it a try though!
Cheers
@golfbravo - I think the only difference between the text and the link is the link uses S1 instead of S2. At the bottom is the picture for the Gen 3:
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My gen 3 system did not go on , apparently because of the rain sensor. The rain sensor was not activated, but connected.