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E80 Nest getting no power Y1 Wire

Community Member

My theromstat all of sudden just stopped working. I have it plugged in with a Power Connector and it has been working fine for two months but today it's giving me errors. It seems to be turning on my AC fine but I'm worried that it will die during the night.


Community Specialist
Community Specialist

Hi Bradyguy99,


Thanks for posting here in the Community forum, and I'm sorry to hear about the situation. I want to check if you are still in need of any help. If so, please answer the following:


  1. What type of Nest Thermostat do you have?
  2. Is the Nest Thermostat newly installed?
  3. Does the thermostat screen indicate that it’s actively calling for cooling?
  4. What's the make and model of your HVAC equipment?
  5. How many wires are there?
  6. How are the wires labeled?
  7. Are all the wires firmly seated into the terminals?
  8. What type of furnace do you have? (gas, electric, etc.)
  9. When did cooling last work?
  10. Did cooling ever work with the Nest thermostat?
  11. Did you turn off the power to the HVAC system?
    • Did you recently turn off any breakers?
    • Have you recently experienced a brownout or blackout?
    • Is there a light switch near the heater that controls an outlet?
  12. When was the last time you changed the furnace's air filter?


I'll look forward to your response.