Have been using thermostat without incident for over 1 year and suddenly
received error E72. All wires are connected as they have been from the
beginning. I attached a photo of the wiring.
Thanks for all who tried to help. I removed my Nest and reconnected my
old conventional thermostat and have not had a problem since. I returned
the Nest to Costco and got a refund. I’m disappointed that I it failed
to function in my condo in FL. I st...
This is the existing wiring in our 1973 built condo. The Nest worked
fine for a year and a half so I'm not clear as to why it would suddenly
stop working and give me an error message. I didn't change anything. I
disconnected the Nest and reinstalled ...
