I had a similar problem, Techs are not all qualified for installing thermostats. The thermostat was installed by the comcast tech and when it came time for my AC to be used it did not work. After a month and many phone calls I finally got it fixed. I live in Delaware and the LAW states only certified HVAC technicians can perform work on thermostats. I was fortunate because due to this law Comcast had to hire an HVAC technician to work on my thermostat. Since then I have not had a problem. I also found a lot of nasty answers on the forums, must be full of trolls.
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