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As you have mentioned , I can try changing setting in 'installer mode', but before that how will I feed port 3 in ST9400C and should I still discard port 8 in ST699 EDIT: Having looked at the ST9400c instructions, if part gravity / part pumped is the type of system you have. It appears that it...

I have very old Potterton Kingfisher (Gravity), and you are right when CH is switched on is it also heats up the HW in cylinder. While going through the other threads found this (similar to mine). https://www.diynot.com/diy/threads/honeywell-st699-to-st9400c-wiring-issues.603919/

Very helpful, but then how should I feed (3 in ST9400), since in old setup (6 takes feed from Live).

Hi, Just to make sure I have not mixed up the wires, I have connected with old unit ST699 and both heating and water works. Below is the wiring diagram with numbers corresponds to where they will go in ST9400. - There is a loop between 5 & 6 >> This need to be discarded ? - From loop from "L"...

Morning, I have followed the instruction and connections as below by not using "8" (isolating by insulation tape), then lights come on on the unit but heating and hot water does not start.

Hi, All I am replacing below ST699 (currently connected with Thermostat and Kingfisher Potterton Gravity boiler) with ST9400C . Need some help with Wiring Diagram. Currently There is a loop between 5 & 6 >> This need to be discarded ? From L there is loop to 6 >> Should I use feed from L to...

Hi, All I am replacing below ST699 (currently connected with Thermostat and Kingfisher Potterton Gravity boiler) with ST9400C . Need some help with Wiring Diagram. Currently There is a loop between 5 & 6 >> This need to be discarded ? From L there is loop to 6 >> Should I use feed from L to...