Google Community, I have a 3rd Gen Nest Learning Thermostat. Left for a trip, thermostat & A/C were working fine when I left. While I was gone there was a power outage at my complex. When I returned home, when I tried to turn A/C on I got the message "Your thermostat has detected a problem with the Y1 wire" (E103 error code). Checked Google help and even stripped the old end of the Y1 wire and inserted a new length of wire in the Y1 slot. Still getting the same error message, A/C still not working. Anybody have any idea why this is happening? Help would be greatly appreciated. As I say, Thermostat & A/C were working fine before I left. Does system need to be reset? Please help!
