It seems that I can't control the fan setting. I want it to be "AUTO" so it runs with the Heat/AC system. But no matter how I press it, it will jump to "AUTO & ON" or " AUTO & Circ ", and the FAN run 24/7 continuously. It drop the room temp when the heating system is on. The rest of thermostat works OK. We had it with the new house we bought from Perry Home 2 years ago. Please HELP!