UK 3rd Gen Nest Learning Thermostat won't boot

[PutneyBaron]

Hi all,

3rd Gen Nest Learning thermostat hardwired to power is refusing to boot. If manually rebooted, the led flashes green, the display shows the nest logo, then the screen goes black and the led gives two brief orange flashes then switches to red flashes. The thermostat will not boot or allow us into any of the system menus. The only messages we can bring up is 'The thermostat s restarting. Back in a bit'. We cannot encourage it into life.
Thermostat was purchased and installed in August 2022, so is only a couple of years old.

[cifuentesj]

Hi @PutneyBaron,

Thank you for your timely post and the comprehensive information you've provided. I've reviewed the input and understand that you are encountering some rebooting issues on your Nest Learning Thermostat 3rd generation and won't let you access any of the system menus. I'm here to help you troubleshoot and find a solution together.

To assist you further, please attempt the following questions:

• When was it installed?
• Do you have more than one thermostat?
• Does the issue show up on the other thermostats too?
• Is the thermostat display on a stand?
• Do you ever take it off the stand to charge it?
• How do you charge it? Directly from the power outlet?
• When did the issue start?
• Were there any power outages?
• Has there been any recent work done on your thermostat(s) or heating system?
• Were there any modifications to the internet configuration (for example, added extenders)?
• Is the thermostat display responsive when interacting with it?

You can do this in the interim: 

• You can power your thermostat from a different source.

• You can do a factory reset.

Please keep me posted.

Warm regards,

Jeremy.

[PutneyBaron]

Hi there @cifuentesj 

Thanks for the detailed reply. I've now resolved the issue by replacing the display part (the whole wall mounted thermostat) of the 3rd Gen Nest Learning Thermostat. In case this post helps others suffering the same issue:

• When was it installed? September 2022, so not very old
• Do you have more than one thermostat? No, single Nest thermostat system (apartment)
• Does the issue show up on the other thermostats too? Not applicable
• Is the thermostat display on a stand? No, wall mounted and permanently powered
• Do you ever take it off the stand to charge it? Not usually, no. But I did try charging it via USB to see if that resolved the issue, sadly it did not
• How do you charge it? Directly from the power outlet? Yes
• When did the issue start? On the day of the OP, so only very recently
• Were there any power outages? Not that I'm aware of
• Has there been any recent work done on your thermostat(s) or heating system? No
• Were there any modifications to the internet configuration (for example, added extenders)? No
• Is the thermostat display responsive when interacting with it? Yes and no. I can make it show the Nest logo when rebooting and it will also occasionally show the 'This Thermostat is restarting' message, but nothing else, so I've no access to any of the system menus etc

I did power it from an alternate source and also performed multiple factory resets, all to no avail. In the end I managed to get online chat support from Vivek in the support team (great support rep!). After we walked through a few questions and potential solutions, Vivek advised that it appears that the thermostat is faulty and the best option is warranty replacement, so that's what I've now done and with the new thermostat paired to the old Heat Link, the system is now operational.

So, thank you for the assistance Jeremy, I hope that this information helps others.

Best regards

[cifuentesj]

Hi @PutneyBaron,

I appreciate you letting me know. I'm encouraged that you resolved the issue, replacing the display part, and shared the information to help others. If you have any questions, please feel free to post at any time.

Warm regards, 

Jeremy.