Hi, my Nest Learning Thermostat (3rd Gen) was running fine the past two years. This year, I left the thermostat power off over the summer, and recently tried turning it on again. There was a blinking orange light which I understood means low battery, so I removed it and plugged it into the wall charger. The light changed to a blinking green light, but the screen still remained dark, even after I mounted it back into the base.
I tried restarting it by mounting it and pressing it down for 10 seconds. The light blinked orange once, then went back to blinking green again and the screen is still dark. I've plugged it back into my wall charger. It's been there for more than a day, and still shows the green blinking light and a dark screen.
I can hear clicking though when I turn the bezel, and my furnace activated after I turned it clockwise far enough, so it appears the actual thermostat is working but the display isn't. I have no idea what temperature the thermostat is set to since the screen is blank. I'm unable to connect it to my phone app since I can't see the activation code on the display, and I unfortunately removed it from my app while trying to troubleshoot.
Will appreciate any help I can get. There is no physical damage to my Nest thermostat; I did not drop it or anything like that. Why is the screen dark? Is there any way to do a hard reset? Is there anyway I can get the thermostat to work, or is it now permanently defective?
