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Turns out the wire was needed in live!!! Works okay for now lol

Yes it works in 1, but the hot water turns off. Might be problem with the 3 port switch

Yes I have one of those. It’s very strange that plugging the wire in 1 or 2 makes things work

Thanks for the reply, how do ai know if I have a 3 port valve

My Honeywell St9400 stopped working and I can't get the replacement to work. Stupidly I forgot to take a picture of the wires before and one of the wires has slipped out!!!! Currently struggling to get a plumber to come due to demand so need some advice: 1. If i Plug the spare wire into 1 the...