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That's great thankyou think I understand a bit better and looks like its the wrong switch. Darren

My friend told me even i could fit this lol but I am stuck. What is is my old thermostat cylinder had 4 wires going in to it Blue ,Brown, Black and green and yellow one. My problem is that the new thermostat only has on the diagram 2 wires going in to cylinder in the C AND 1 slots. Do I...