I was told that when your heat or A/C is running, the thermostat is
pulling power from the battery. When the heat or A/C hits the desired
temp and stops, the battery can recharge by pulling power from the R
wire. So, with most of us having the A/C on...
This is exactly what just happened to me. My Nest thermostat, 3rd
generation, worked perfectly without a C wire for 18 months. A few weeks
ago it started to go offline for a few hours a day. The offline time
grew until it stopped working. I tried cha...
