Thanks for your Reply looking at the boiler i traced back wires to this from programmer looks like a bit of a doggy install from plumbers cost me around 2700 for this replacement boiler, when i had my loft ext done were they removed my old convectional boiler out of the loft had a cylinder up...
hi all any chance of a looky at this for us please
Have a Drayton heating programmer looks an easy change over to the Nest control unit and thermostat (Honywell t40) just want to get my head around it before i start on programmer currently have this config:
n = 2 wires blue
L = 3 wires brown...