I'm installing a previously unused Nest thermostat, and when i fit the thermostat onto the base, the screen remains blank and the LED at the top of the thermostat flashes green. I initially waited over 30mins in case it was reloading software, but its now been in this state for over 12 hours. I've removed and reinstalled it, confirmed that it sits on the pins correctly, and also held for 10 seconds until the LED flashes red, released, and repressed and released, but still the only response is the green flashing LED. I've also removed it and connected directly to a power outlet via the mini-USB connection, When i do this, after a couple of minutes the display shows a "home" image, and then directs me to reconnect it to the base. However on reinstalling it to the base, I'm back to a blank screen and green flashing LED.
I've got another Nest in the house and this works on either base unit without problem. I've also checked the new Nest on both base units and i get the same green flashing light in both locations.
I've had the unit that isn't working for a few years, but its been in its original packaging the entire time. I simply never got round to installing it, so suspect that the warranty has expired, even though its never been used!
I've looked at other posts, and see lots of similar examples of this problem, but I haven't found a post that recommends anything other than what I've already done. Is there a solution to this or some way of hard-setting the unit ?
