Only two wires, one black and one white, are left over from my old digital thermostat. The white wire is attached to W and the black wire to O/B. Won't turn on the baseboard hotwater zone although it says HEAT ON zone and flashes RETURN. What Now?
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Only two wires, one black and one white, are left over from my old digital thermostat. The white wire is attached to W and the black wire to O/B. Won't turn on the baseboard hotwater zone although it says HEAT ON zone and flashes RETURN. What Now?
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