Nest learning thermostat won't power on

[Roger_M]

• Installed new Nest and powered up both AC and heat. No response on the thermostat. All the wires are properly connected, including C. How can I tell if the thermostat is faulty?

[Patrick_Caezza]

Post a picture of the original thermostats wiring

Check to see if the fuse on the control board in the furnace/air handler blew.

[Markjosephp]

Hello folks,

I wanted to stop by and see how I could help.

Thanks for the help here, @Patrick_Caezza.

@Roger_M, your thermostat's battery might be dead because it was locked in storage for a long period of time. Please try charging it for an hour using a USB charger. Make sure to connect it directly to a wall outlet, and you should see a message on your thermostat screen and a green LED light flashing. Have a look at this article and let us know if you need more help.

Best,

Mark

[Jenelyn_O]

Hi there,

Chiming in — I wanted to follow up and see if you still need help. Please let me know if you're still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks @Markjosephp and @Patrick_Caezza for your help.

Best,

Jenelyn

[Jenelyn_O]

Hi Roger_M,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Best,

Jenelyn