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Nest Learning Thermostat -dark screen and red flashing light

Kdh
Community Member

Installed two Nest Learning thermostats 6 months ago, and both have worked fine.  About 12 hrs ago, the unit for the main part of our house went offline and displays a red flashing light.  Screen is dark.  Tried all the troubleshooting suggestions.  Unit attempts to restart, but goes dark again after the “Restarting — Back in a bit” message.  Unit briefly woke up and restarted on its own at about the 11 hour mark, the programmed temperature displayed along with the current room temp, but went dark again and nonfunctional after about 1 minute.

 Swapped out the thermostat with the one in our master bedroom, and the HVAC unit came on immediately and is working fine.  When the problem unit is reconnected to the master bedroom base, I get the same dark screen and flashing light.  It appears to be a problem with the Nest unit and not the HVAC system or wiring.

Next steps?

2 REPLIES 2

laurentbourg
Bronze
Bronze

Try charging the problem unit with a micro usb cable for a couple of hours. The micro usb is on the back of the display unit when it’s pulled out of its wire base. 

Kdh
Community Member

The unit powers up, but is dead again within 12 hours.  I've been waiting for a link since Weds evening to order a replacement