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Hi all Thank you for all the input . I have now got the system working as should. As Picasso said I was missing the link from terminal 3 in the heat link to the R on the boiler terminal block . I disconnected the thermostat wires from the boiler block as it is 24 volts (I think) and the nest...

Hi Picasso firstly thank you for such a fast reply NO .......... but since posting i have just found this link, https://www.cnet.com/uk/how-to/how-to-set-up-a-nest-thermostat-in-the-uk/ It re enforces your comment , the video , though ive had to watch it a few times, shows a different way...

Hello all i have the GLOWWORM FLEXICOM 30cx combination boiler, i have bought the Nest V3 smart thermostat , i have wired up the boiler and the thermostat as far as i know correctly from the diagram with the nest instructions This is the fused power switch to the boiler the white sheathed...