Hi, New to all things thermostats but happy to take on a DIY challenge, but within the constraints of my ability, hence the request for guidance.
I have the 3rd generation uk Nest that I wish to install. The wiring I am seeing is nothing that was expected. Pics below.
I have a timer for the CH and hot water - even though the HW is via a combi boiler.
There is a dial Thermostat next to the timer/controller
The timer/controller has one twin and earth to it from the boiler with one wire direct to the HW connector and the other via the thermostat to the CH connector (I see the thermostat as being a temp switch to the controller.)
So the controller has live and neutral to it for power then two wires from the boiler to HW and CH. The two wires from the boiler are not carrying mains current so i am assuming they are switch wires being made by the timer controller?
Thats where I have got to ..... it could be I need the help of a professional - please say so but if there is an obvious connection(s) to the Nest wireless controller then I'm happy to receive suggestions. I am ok to leave the timer controller in situ with it on for both hot water and CH and passing whatever switching wires is needs to the Nest wireless controller. I know I will need to give the Nest wireless controller 240v.