Hi Doodhouse,
Thanks for reaching out to our community.
I’m sorry to hear that your Nest Thermostat (2020) is running all the time, but you only want it to run when the furnace is running. No worries, help is here.
Before I start further troubleshooting, let me ask you a few questions:
- Could you please confirm what type of Nest thermostat you have?
- When did the issue start?
- What other strange symptoms have you experienced since the problem started?
- Are there any error messages? If so, what are they exactly?
- Is this a new installation?
- Have you checked your Heating, Ventilation, and Air Conditioning (HVAC) system's compatibility with your Nest thermostat through the Compatibility Checker tool?
- What kind of HVAC system do you have?" (Heat pump, conventional system, etc.)
- Do you notice any intervals or specific patterns between these strange behaviors?
- When was the last maintenance check for your HVAC system?
- Have there been any recent changes or upgrades to your HVAC system?
- Does the issue happen on heating only, cooling only, or both?
- Is this the first time you're activating heating or cooling since the season changed? (Example: winter to spring)
- Have you checked the power readouts on the Nest thermostat?
- Do you have a common ground wire or C wire?
- Are you familiar with the C wire?
- Have you experienced any power outages within the last few days or weeks?
Thanks for your kind attention; I will be looking forward to your answer.
Best regards,
Virna
