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Yes you’re correct N,L & 3, I’ll check again to see if any old wiring was disconnected & left behind pipes Thanks again for help

Thanks, I took the ST9400c off and there are only 3 wires so looks like I need to get another cable in and change wiring at my connection box

Hi I am looking to install the Wiser 2 zone kit, I currently have Honeywell ST9400c controlling my hot water and Honeywell CM727 wireless thermostat controlling my heating, The ST9400c is next to my boiler but the CM727 wireless receiver BDR91 is in my loft Where would I install the wiser hub...