Hi all,can anyone help , im changing an old room stat , the old one has three connections with no markings , the cable running to it has three wires blue , brown and yellow/green the new stat has connections marked 1 , 2, 3 and 4 , can anyone advise me as to what goes where .[i recently had to re route the room stat cable and i thought i had re connected the wires in the right positions , but on testing the three wires going to the room stat with an electrical screwdriver they all seem to be live ! does this mean i have wired them in the wrong position in the connector block. b][/b]