Hi @chachou1982,
Thank you for posting in the community. I’m sorry to hear that your Nest Thermostat is offline and showing a “no power to R wire” error message. I understand how important it is for you to make your Nest Thermostat work. I'm happy to assist.
To gather the necessary information, please answer the following questions:
- What type of Nest Thermostat do you have? The following article might be helpful: How to tell which Nest thermostat you have.
- Have you checked if the breakers are on?
- Have you had any power outages in your area recently?
- When was the last time your HVAC had maintenance?
I'll be waiting for your reply.
Best regards,
Derick.
