York · Smart Equipment Control
This is not an alarm, but an indicator that the system is currently using the return air sensor for temperature readings because it cannot recognize a space indoor temperature sensor.
Click steps to track your progress.
Verify that the space indoor temperature sensor is properly connected to the SEC board.
Check the SEC board settings to ensure 'T-Stat Only' is configured correctly if you intend to use only the return air sensor.
If a space sensor should be active, troubleshoot its connection and function.
If the indicator is displayed when it shouldn't be, consult the advanced settings or support for the SEC board configuration.