Yep red’s definitely live and is live and I’m pretty certain yellow is the switch back, could it be a faulty thermostat, it was left over from a job I done and has been sat in my spare room for 12-18 months
Currently trying to replace my old satchwell thermostat, I was given a heatmiser slimline v2 but I’m struggling to get it going, I’m wiring it as :
Red - live
Blue - neutral
Yellow - switch live
Bare- earth
On the heat miser I’ve followed the instructions and put a live loop between live...