OK so I'm not going to bother wiring it up for hot water, assuming it was even possible. I don't need it, I just thought it'd be a bonus if I got that connected to the Nest. I'll just have CH connected to it. Perhaps someone could confirm if I've got the CH wiring correct though just in case...
I wanted to install a 3rd gen Nest thermostat and I've run into a slight issue with the complexity of the wiring of my Potterton Promax HE Store.
It's got the programmer (A Horstmann CentaurPlus C27B) "built-in" to the boiler along side the control board which can control hot water and central...