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    Nest Thermostat 3rd Gen wiring- converting from Honeywell BDR91 relay box

    Thanks for all your replies. I've definately got a better handle on what the wiring should look like. The Nest website does provide a wiring plan relating to a 230v combi boiler (photo attached) which seems to confirm the information you all have given me. I'll think my best course of action is...
  2. H

    Nest Thermostat 3rd Gen wiring- converting from Honeywell BDR91 relay box

    Thanks for your reply. I did have a look at the Nest installation manual on their web site which was how i was able to determine where i thought the black wires would go n the Nest Heatlink unit. I agree with you though that the wiring in the Honeywell is awful. My concern is that it was a...
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    Nest Thermostat 3rd Gen wiring- converting from Honeywell BDR91 relay box

    Hi I have a Vaillant ecoTec Pro 28 combi boiler which currently operates with a Honeywell wireless programmer and a Honeywell BDR 91 relay box. I'm thinking of replacing the Honeywell controls with a Nest 3rd Generation Thermostat and trying to determine whether or not i need to get it...
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