I've had a Nest E for at least 4 years and it works like it should; heat does heat, cool does cool, all the learning stuff does it's thing. Definitely wired properly.
I noticed something interesting today, and the thermostat has probably always done this but I've only just noticed. I have it set to cool down to 74°F, and lately it hasn't needed to run because it's cold. However, today the furnace turned on for some reason making heat; house is 69°F according to Nest. I thought there was an issue, but sure enough, the history shows the heat has been coming on once in a while for the past few weeks (the bars are orange). The thermostat is set to only cool (not "auto", if it even has that function), and the screen was blue while the heat was on. A/C unit outside was off, furnace was definitely heating (outside of the unit was warm). Curiously, if I set myself to away manually in the app, the screen goes orange as if it's in heating mode for some reason.
I checked settings for what was going on, but the house temp was at 69°F, set temp was 74°F and it was blue. My "safety" temp for the house is 40°F. There seems to be no settings for 68°F or 69°F that would trigger something. I thought it might be "Eco-temp" because it's 70°F, but the furnace turned off while it was still 69°F.
Auto-schedule is off, Time-to-temp is "ready", Early-on is off, cool-to-dry is off, sunblock is off, leaf is "ready", airwave is on/ready. Eco temp is set to 70°F, safety temp is 40°F. Outside temp was 49°F at the time, inside humidity is 60%, and Nest knew I was home.
