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I thought that due to this being an ancillary device due to it not bypassing any safety systems or directly linking to the gas control it was exempt from that legislation?

Yes thats right, without that it will ignore the Nest and just use the onboard controller

I had a lot of trouble finding a wiring diagram for this originally when i needed to install it, so i thought i would post my own here in case anyone else needs to do this in the future. Im NOT an electrician, so please double check before you do this, but this method worked for me...

Hi, Ive got a Valliant EcoTec Pro30. I believe its the same board/controller. Ive made a wiring diagram if anyone can double check it for me? Professional, i know. Does anyone know how the timer control on the front of the boiler effects the Nest? Does unplugging the rt/24v terminal...