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I'll try and get some pictures up tomorrow and hopefully get it working. thanks all.

I've done exactly that but I haven't linked T1 & T2 as im not placing the Nest thermostat in the same position as my old Honeywell.

nope nothing at all

yes it is on constant with me but it's still not calling for heat when I increase the temperature on the Nest.

yes it does stay orange.

no I haven't. will that solve my issue, and if so how do I go about doing that?

I can hear the Heat Link clicking when I turn the dial to heat up but the boiler isn't firing up at all.

finally got it to connect. I had to press down on the Heat Link reset button for 20 seconds for it to connect. I now have another problem as the Nest thermostat doesn't heat up the boiler when I turn the dial temperature up as if the call for heat doesn't respond to tell the boiler to fire up...

I am using the existing thermostat wires that were connected to my old Honeywell stat if that makes any difference for not connecting to the Heat Link?

I've tried connecting the way that diagram shows but for some reason it's not connecting. Any reasons why this is?

I can't seem to upload a picture for some reason. What I have connected to the Heat Link is live & neutral which is connected via the mains and that's as far as it goes as I can't seem to pin point which cable is the call for heat and common. Do you know which cables I need to put in terminals...

Could any of you give me some guidance on how to replace my Honeywell T6360B thermostat to a Nest thermostat. I have a Grant Vortex Combi 21e and the current stat is connected via terminal blocks 25 & 26. I have connected the Live and Neutral via the mains on the Nest Heat Link but I can't...