Installing Nest on a Potterton Promax HE Plus

jbondo

Hi all,

Wondering if you bright sparks (No pun intended) would be able to provide some assistance!

I have a Potterton Promax HE Plus and this afternoon have been trying to install Nest 3rd Generation Thermostat.

My issue is I some how don't think the Heatlink is installed correctly, and inturn is not providing power to the Thermostat. I have been following this video: https://www.youtube.com/watch?v=F2iRPlSyS10&t

This is what my Programmer looked like before I installed Nest: https://imgur.com/a/pVOpS0f & After I Installed Nest: https://imgur.com/a/AU1yYea

This is what the Theromstat looked like before Nest: https://imgur.com/a/Kz20yRH I have plugged in Theromstat into 3 (H) & 4 (TL)

The theromstat is currently showing Error "H72: The theromstat isn't connected to the power supply". I think this may be because on the Heatlink, T1 + T2 have nothing plugged into them as this was not mentioned in the video.

The Heatlink powers on and the radiators are warm however I can't really tell if this is being warmed by the Heatlink or not.

Is anyone able to provide some assistance? I'm thinking I may have to revert back to Potterton Programmer & Thermostat and then get a professional in!

Thanks in advance.