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Sorry to dig up an old thread, but the issues you have been having are very similar to mine. After messing around with the connections on the boiler circuit board, I noticed the thermocouple connection was dodgy (turns out I had a dry solder joint). What I find odd is that with the thermocouple...

Link wires added and it works! Thank you for pointing out my inability to read my post Wiring tidied up too. @stem and @RandomGrinch here's a beer Edit: just noticed android emojis don't work. So imagination needed :)

DOH! I even wrote that in my first post. How did I miss that?!? I'll add and report back (and show my tidier wiring centre wiring

So, the Nest thermostat arrived today and I wired it as above. However it is not working at all. The nest is clicking on but the boiler is firing. The only changes I have made to the wiring centre is removing the 4 wires that went to the thermostat and moving the remaining red wire in terminal...

So obvious! Thank you stem!

The cable you circled is indeed what goes to the thermostat I confirmed this by connecting the blue and red wire together at the wiring centre (power isolated at the fusebox) and then did a continuity check at the thermostat and got a satisfying beep. I have noticed that the wiring centre is...

Thank you stem. Unless I not understanding this correctly I don't think I have enough spare wires to power the nest with T1 & T2. Would it be possible to put a 240V>12V power supply next to the wiring centre and use 2 wires that go to the existing thermostat to power the nest? Routing a cable...

Am I right in thinking the CH OFF wire is not needed because without a call for heat the CH is off (either from the LP241 or an 'open' thermostat) If true, can terminal 1 on the heat link have nothing connected to it?

Hello. I know this question has been asked many times but I would just like to clarify a few things before my new thermostat arrives. My setup: I believe I have a Y plan system (a 3 way valve is located in the airing cupboard upstairs along with the pump and 'wiring centre'. The LP241 is...