Hi Ian
Thanks for your reply I appreciate that. I wasn't sure if I was on an S or Y plan - now i know.
I labelled the wires before disconnecting anything from the original controller. So I understand you're saying that I may be missing a wire on terminal 4 of the heatlink, and this will be the...
I am trying to replace a British Gas UT2 (which google tells me is a rebadged Drayton LP711 single channel controller) with a Nest 3rd Generation Heatlink (HL) and stat.
I've used the excellent resources on this forum to get me so far, but have hit the limits of my abilities and would...