A:AnswerHave you checked the wires at the unit itself? Make sure that the C wire is connected on the c terminal at the unit. I had this same problem and found that this was the issue.
A:AnswerNo bridge or Hub is required. Once installed, follow directions that come with it and you will be able to control it from your smart phone or tablet.
A:AnswerI had same problem after installing my Honeywell I set a schedule that was energy saving yet still comfortable and then was able to lock it with an access code to prevent changes and it is easy to monitor via phone app or Alexa and Google home