Hello Eric21,
It sounds like you're having some issues with your Google Nest Thermostat. If you've already changed the batteries and the display still isn't turning on, there are a few troubleshooting steps you can try.
Firstly, ensure that the batteries are inserted correctly, with the correct polarity. Sometimes, even a small misalignment can cause issues. If that doesn't solve the problem, you might want to check if there's any dust or debris around the battery contacts and clean them gently. Also, use only high-quality 1.5 V AAA alkaline batteries from a known manufacturer.
If none of these steps work, it's possible that there's a deeper issue with the thermostat. In that case, check that all wires are properly connected and the tabs are pushed down. Check that the HVAC system at the breaker box is turned on.
Let us know if you have any more details or specific message codes seen on the thermostat; feel free to share them for more targeted advice.
Thanks,
Mark
