I have two of these thermostats set up currently. One doesn’t have a C-wire, so runs on pure batteries. The second had a C-wire (blue, tested with a multimeter) but I can’t tell if it’s working with the C-wire or not? The thermostat still wouldn’t turn on until I put batteries in and the display looks identical. How can I confirm that it is functioning with the C-wire and working as a Zwave repeater?