2 years with the Nest and never had a c wire connected to it. Now it's asking for one, getting all kinds of errors.
I am setting it manually but when I set it at 68 at night (heating) it keeps changing to 73. It won't stay where I set it. Why would I need a c wire now after using it for over 2 years without it and it worked fine!
The furnace seems to be working fine. House stays warm (and too hot at night because it sets itself to 73) so I don't believe it's the furnace.
