3rd Gen Thermostat no wifi and lin 20 mA

[AlMark]

Have a 3rd Gen Nest Thermostat, about 4 years old, always worked well.  Recently went offline, low power apparently.

Battery 3.647V

Voc 37.81V

Vin 8.08 V

Lin 20 mA (a)

all 4 wires seem well connected, AC and heat still work but Wifi and App not connecting?

Suggestions?

[Patrick_Caezza]

@AlMark 

Is there a C wire connected?

If there isn't one, then most likely, your system hasn't been able to keep the internal battery of the thermostat fully charged. The best way to solve this is to install a C wire. You can use a spare wire if there is one, or you can use the Google Nest Power Connector.

[Jenelyn_O]

Hi there,

Thanks for reaching out. I hope you get the answer you're looking for. You can visit this link as your reference with regards to the use of C wire or Nest Power Connector. 

I appreciate your help, @Patrick_Caezza.

Best,

Jenelyn

[EmersonB]

Hello everyone,

@AlMark, we wanted to follow up and see if you are still in need of any help. Please let us know if you are still having any concerns or questions from here, as we would be happy to take a closer look and assist you further.

I appreciate the help, Patrick_Caezza and Jenelyn.

Regards,
Emerson

[Dan_A]

Hello again,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.
 

Cheers,

Dan