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I can put it back to how it was which is my next plan so I can have some hot water :D

Okay. If that's the case then why would heating come on when I press water. And nothing happens when I turn heating on? The C27 on the back of it told me which wires went where so I just followed the right instructions.

I do have Gravity. I have a water tank in the loft which refills the tank in the airoom cupboard. So it must be gravity? I still have the 3 way valve. So I'm quite unsure what y plan is now actually.

Damn. Think I have wired wrong due to it being gravity fed which I assumed was Y plan. Does below look legit? The only bit that doesn't look right is link 3-4 as well. When CH is on HW needs to be on too. You can do it without a relay if you do the wiring to the nest slightly different...

Added all the pictures below if someone can confirm. My link cables are brown. Cheers, Chris

It definitely was working with the C27. However.... About a year ago I did have an issue with it and slapping it seemed to cure it.

On further looking I've just noticed turning the thermostat up doesn't kick the heating in. Boosting water only turns heating on.....

Thanks! I'll double check wiring when I get home this evening. I know it sounds stupid but the screw on the nest pinches the wire from a bottom up position so just make sure it get pinched in that gap? Also yeah I thought it was Horstman when I googled it. But the one I have definitely saying...

Hey Guys, Sorry I know there's been lots on here about nest and y plans. I thought I knew what I was doing but seems nothing I do works when it comes to boilers. So, I have my third gen with 3 way valve control. My old unit was a c27 Honeywell control. C27 standard type backplate. Neutral...