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hi Ian, the R Bus connector when new just had a jumper across it, i believe that this is for the Baxi usense remote unit.... which is what i should have purchased :) i'm away for a few days now but will try what you suggested in the last message as soon as i get back. many thanks again Colin

Hi Ian, Ok thats starting to make more sense now, ... this is a pic of the whole PCB your help is very much appreciated :) Colin

Hi, yes there is, its a 3 pin connector port... one of which has an earth symbol and the other two are blank.... not at my house at the minute, but i know thats there as i have looked at it.

I have tried them into 2&3 and now to the OT terminals ... With no luck :( I do know that the RBus is the direct connection for the baxi usense smart controller, so I thought that it was probably the connection, boiler end for the nest...

no underfloor, yep its a new oil fired boiler... ok, i will try that Thanks Colin

nothing, its a new install... so i purchased the Nest Gen3 Colin

Hi Ian, leading on, connected already to the Tout is an outside thermostat, i'm guessing some sort of safety device so the boiler doesn't get to cold? if i disconnect this and attach the nest, i get a red error message saying "outside temp closed"? Colin

Hi Ian, hehe... it does read a bit confusing i admit! sorry for that. I'm trying to get my nest working, and just got a bit confused where to connect it to.. ok, so two wires from the Tout plug, where would they go into the heatlink? 2&3 i'm guessing?

Hi all, I have been trawling the internet trying to get some information on how to connect a nest to my new boiler, i live in Spain and the instructions for the boiler don't seem to be available in English... Baxi didn't either bother to reply! as i understand it the Baxi have the usense ubit...