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Thanks for that croydoncorgi, the thermostat is a recent addition to the central heating as we have had to have a new boiler fitted a few months ago, up until then there was no thermostat control on the wall so the wires aren't from a previous installation I thought it was spare also but it...

Hi can anyone tell me which wires go to which connection on a siemens landis&staefa raa02 room thermostat please there are 4 wires going to it blue, black, brown and earth there are 3 connections in control unit the brown is to the 1st 1 , the second 1 has nothing going to it and the 3rd one has...