My default thermostat had a C wire attached to it, and it was blue. When I removed the old thermostat I also found a sneaky black wire tucked behind it not connected to anything.
Since the old thermostat used the blue wire for C, I went ahead and used that one for the Nest. I'm getting the 'delayed' message that indicates that the power isn't sufficient. For good measure, I tried the black one instead and had identical results.
Has anyone else come across this issue before?
