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Not a very helpful reply to someones first post. I might not be an electrical master, but I'm perfectly aware which colour is which. I'll make sure I write the types next time instead. And yes, I did have the common sense to isolate it first.

Hi, I want to change my room thermostat from Sunvic TLX9201 to Salus RT300 but want to check the wiring before I do so. There are currently four wires coming out the wall. Blue + 2x Brown connected to the thermostat and the Green/Yellow connected to the back box. Can someone help me confirm...