I cannot speak electrician, but I had the same problem.
Edited on 2012-12-29 23:47:49
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Okay, electricians and handymen, explain this. 
posted by Papa November
The issue was the wiring on my system, not the thermostat. After trying as much troubleshooting as I could myself, a professional electrician came in and essentially rewired my air handler to account for the new thermostat.
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