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Thanks I shouldn’t have gave up so easily.. the nest is now working perfectly must have been a wire not fully making contact

Hi all, I am new to the forum and have been searching for advice on wiring the Nest to a Vaillent TurboMax. I originally installed, myself, a wireless thermostat a few years back the Honeywell CM700. This has worked perfectly but now technology is evolving I am looking to swap it out for the...