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I have a WiFi/IP thermostat, how can I tell if the backplate is communicating to the faceplate?

With the faceplate connected to the backplate, look through the top vents of the backplate.  If you see a red LED illuminated on the backplate then the backplate and faceplate are not communicating.  If you do not see a red LED on then the backplate and faceplate are communicating.