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Jd67
I am thinking of changing from old thermostat to digital. There are 3 wires in old one but only need 2 in digital. The grey wire is not needed what is grey wire for
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I tried Grey and black seperate but nothing happened. I am thinking of changing to a simpler digital because this Salus RT500 is a bit complicated for us. Will try wireing againMost old thermostats were 'in' on 1 and 'out' on 3 so i would say Grey should be SL, when you tested it did you have timer calling for heat?
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