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Thermostat will not turn on

Community Member

My thermostat Had a red blinking light. After checking wiring it eventually change to Green. It has been green for over 24 hours. It will not turn on. I removed it from my acccount and tried to reinstall. CAnnot reinstall because it will not turn on. I cannot run heat or AC please help. Model is display 3.5


Community Specialist
Community Specialist

Hey Scarb,


I’m sorry to hear you’re having trouble with this. No worries, we'll check this out. What type of Nest thermostat do you have? When did the issue first occur? Is the thermostat's display seated properly? Are all the wires of your thermostat seated firmly in its terminals (with no loose or exposed wires)? Also, what country are you located in?




Community Member

I got an AC pro to come check things It was not getting electricity. He fixed that and the original nest would still not work. We installed a new one (different model) and it worked. The old one still has a green blinking light. I would like to install it at my home, but have not had time to try it yet. I am in USA.

Community Specialist
Community Specialist

Hello folks,


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


Thanks for assisting, Archie.


@Scarb, I'm sorry to hear the issue still persists, and I appreciate you reaching out to an HVAC technician for an inspection. I'd love to know more about this.

Could you try charging your thermostat display for an hour with a USB charger and seeing if it turns on? Also, what model of new Nest Thermostat did you install?


I'll look forward to your response.




Community Member

My thermostat is blank, no lights, no power nothing. It shut off to recharge the batteries and will not turn back on. HELP please