Learning Thermostat Stopped Working

[Benso]

I’ve had 2 nest thermostats for a couple of years. They’ve worked fine until a couple days ago.

I got the e195 “no power to R wire” error. I checked everything else in that system and nothing was wrong. I tried swapping in the thermostat from upstairs and it worked just fine.

What went wrong with the first one and how do I get it to work?

[EmersonB]

Hi Benso,

Thanks for reaching out here in the Community. To know more about this issue, I’d like to confirm, where are you located? Do you have a C wire connected? If so, try removing it then check if the issue persists. Kindly share a photo of your wiring setup here. Check the power reading, go to Settings> Tech Info> Power> share all the information there. You may also check the power reading of your R wire using a voltmeter if you have one.

Looking forward to your response.

Best,

Emerson