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Thanks for replies, puts my mind at rest that it isn't a bodge job and this is normal :lol: I chose a mains room thermostat as I figured it will be easier than having to change batteries (Horstmann AS1 as I like the simplicity of its display), so will use all three wires, and set the...

I want to change the mechanical thermostat for a programmable room stat, both to have a 'night temp' and better programming. The current mechanical thermostat has 3 wires which I've tested and found: red/orange - live yellow - neutral blue - switches live as thermostat is moved, ie live...