Search results

Hi I have a Honeywell sundial programmer and wireless thermostat model no st9420c on an s plan system I am about to change it to a nest3rd gen learning thermostat and just wanted to understand which wires need to go where I know I will be told that I need to a qualified electrician and I...

I have had a boiler installed recently ecotec vaillant 637 and I was checking the wiring after as the plumber wasn't overly confident when doing it All looks ok but on the wiring instructions attached for the Honeywell programmer, from the boiler it shows a separate boiler and pump. the earth...