Replacing Drayton and British Gas Timer with Google Nest

[amarjeet]

I have a Drayton Digistat wireless(thermostat, I think) and British Gas timer and I want to replace it with Google Nest.

The receiver was sitting on the wall and I removed it. It is wireless but I saw a hole in the wall behind it (new house) which is ideal so I can feed USB power to Nest Thermostat.

Now to install the heat link, would I need to access the boiler at all seeing as all the cabling has been done already? Have a look at the low angle pictures of the receiver and timer to show where and how the cables are patched. Hopefully this gives you an idea.

The boiler is a Vaillant Boiler.

Any suggestions or step but step would be incredibly appreciated.

I tried searching the web but couldn't find anything about how to replace nest with these two.

I am not a qualified electrician but very handy with things and a safe pair of hands.

Thank you

 

[RandomGrinch]

have a Drayton Digistat wireless(thermostat, I think) and British Gas timer and I want to replace it with Google Nest.

With the power turned off from the FCU switch, could you show us the wiring behind the digistat receiver and BG programmer?