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I have tried to test the wires but seem to get nothing at all an tried to put thermostat at different positions and get nowt

i have tried to test the wires but getting nothing from black or grey no voltage at all so i dont no if im doing it wrong or not

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hi there I have this old thermostat it has a black an brown wire connected with a earth an grey wire not used I'm looking at a new smart thermostat but to my understanding I need constant power would I get this from current set up