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Easy.. especially when you have a multimeter at work and you are at home.. thought someone may have come across it before!

Hi I am replacing an old Satchwell room stat with a "Digistat3" from Drayton (Invensys Climate Controls Europe).. In the back of the old unit are red, blue and a yellowey-green (Earth). Now i am not stupid (my wife would tell you otherwise) as i spent 7 years in electronics.. however...