Hi @mrelmo,
I understand your frustration with the Nest thermostat. I apologize for the trouble you're experiencing. There are a couple of possibilities for why your Nest thermostat is showing a low battery warning even though you believe a C wire is connected. Let's troubleshoot:
C Wire Connection Verification:
- Double-check the wires: Ensure the C wire is truly connected to both the thermostat and your HVAC system's control board. Look for a blue or common (C) labeled terminal on both ends.
- Secure connection: Make sure the C wire is securely fastened in the terminals on both the thermostat and the control board. Loose connections can prevent proper power delivery.
App Information:
- Unable to Test: The "unable to test" message might indicate the app can't verify the C wire connection remotely. This doesn't necessarily mean it's not connected physically.
Nest Power Connector:
- Not detected: The message "Nest power connector not detected" suggests the app isn't recognizing a Nest Power Connector, which is an alternative way to provide consistent power besides a C wire. If you're not using a Power Connector, disregard this message.
Troubleshooting Steps:
- Power Cycle: Turn off the power to your HVAC system at the breaker for 30 seconds, then turn it back on. This can sometimes reset the connection.
- App refresh: Close the Nest app completely and relaunch it. This can refresh the information displayed.
- "Not detected" or wires not detected (Nest Thermostat only):
- Make sure your thermostat is set to Off mode.
- On your Nest Thermostat, select Settings > Equipment.
- Select Power Connector > Power test.
- Wait for the power test to finish, and then select Done.
- To confirm, select Settings > Equipment > Power Connector > Power Status.
- The screen should now read “Nest Power Connector Detected.”
If the issue persists to assist you better, we'll need some additional information. Here's the contact us form once you've completed the form, please let me know.
Best regards,
Brandon
