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You can't always go by the color codes of the wire. You needed to see where the wires themselves were hooked up on your old thermostat. As that is not an option any longer you will now need to go to the control board at the unit to see which wire is on which terminal and attach them to the thermostat the same way. When the contractor originally built my house the upstairs and downstairs thermostats were wired differently. On one my blue wire was in the green position and the other one the blue wire was my spare for the "C" wire. It doesn't matter what their color is as long as they all are hooked up correctly at both places (thermostat and control board). Hope that helps! Good luck!
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