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Eureka:D:D Johnmcd you were 100% right. I've cut link 1 and now all is working as should. Stem, your thoughts on why my old setup was appearing to be working OK was because both CH and HW were always set to on at the programmer with the CH turned on or off via the room stat when not needed...

Ok so it looks like I best go and cut link 1. Now I have visions of me playing out bomb disposal on one of those films on tvo_O keep your ears open for the bang:mrgreen:

I did have a slight concern about that link but that wiring centre was not causing any issues prior to fitting the Nest Heat Link? I would’ve thought my original system control was classed as a programmer. Is that the case? If so then it’s strange link 1 should be cut but all was working ok...

Update I’ve checked the wiring to make sure all screws are clamping on copper and not on the PVC and all is good. I’ve reset system back to factory settings and then reset everything. What I’ve noticed is that my phone does not show the hot water option in the app? I’ve pressed the Heat Link...

I've not used the Heat Link button to try things manually, but I'll give that ago when I factory reset the system.

Thank you for the reply stem. So it looks like my wiring is correct, which is great to know. I will defiantly go and check that I'm clamping all the screws to copper as opposed to any PVC sleeving. Assuming no screws are clamping on PVC I suppose my next course of action would be to do a...

Update as advised Original time control wiring at boiler left as is at boiler end and control turned off. The time control wiring at the Sundial wiring centre has been removed from the programmer terminal and made safe within a new terminal block and kept seperate. Original room stat wiring...

OK people 1st time post after trying to search and resolve my issue. Hopefully someone can point me in the right direction. My set up is an S-plan system with a Potterton Suprima boiler located downstairs with CH and HW time control integrated within the boiler housing. Honeywell L641A1039l...