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Hi all, Literally on the brink of divorce I have spent so much time in the cupboard this weekend. System is y plan, boiler is a potterton netaheat with a live & switched live. This diagram best shows my set up now. On the nest L - main live N- main neutral 1- 2-jumper from main live 3- 5...

Hi No expert here sorry! Just brought my Honeywell set over to my new house and want to replace the Horstmann that's here. Honeywell had 2 com wires and a 240v feed on my combi boiler but in the new place the Horstmann just has 3 wires. I'm not sure I understand the earth at all...