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Hi, thanks very much for taking the time to reply. The boiler is in a cupboard upstairs, I have two thick cables going into the FCU then coming out I have 2 smaller white cables. Which are the L N E for the boiler, and the 2 connections for the Honeywell Thermostat which is downstairs, Then I...

Hi guys, my first post on here and I’m helping somebody can help me to understand the wiring on my thermostat & programmer. I’ve been toying with the idea of getting new and updated programmable thermostat, when I’ve been looking at different ones, it got me curious about the wires that were in...