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Hi Stem, I re-installed it and it's now working properly. I wired it exactly as before, so I must have caught one of the wires on its sheath or something - as you suspected. Thank you so much for all your help (and patience!) Cheers Tony

Hi Stem Many thanks for your diagram, but that's exactly how I have it wired (the previous installer hadn't labelled the wires correctly). Anyway, it's not working properly, so I've put the Honeywell programmer back. I will book a Nest Pro in The New Year. Kind regards Tony

Hi, many thanks for your response. Yes, I did put the earth wire into terminal 4 on the Heat Link, but it didn't make any difference. The boiler still keeps shuting off, despite the Nest Thermostat calling for heat. Also, I haven't yet disconnected/bridged out the old room stat in the wiring...

Hi All I recently bought a Nest 3rd Gen and decided to install myself. I'm an Engineer, so thought that it would be a piece of cake (I'm not a heating engineer or an electrician though!) Attached is a pic of my Honeywell ST699 as it was (working perfectly) Attached is a pic of my Nest Heat...