Diagnosis
The thermostat is in Permanent Hold mode, overriding the scheduled program. This occurs if you manually adjust temperature on the device or in the app and select 'Hold Until Changed'.
How to Fix It
On the thermostat's main screen, tap the current mode (Heat, Cool, Auto). Look at the bottom of the screen. If it says 'Hold', 'Hold Until', or 'Permanent Hold', tap that text. Select Run Schedule to resume the programmed schedule.
If That Didn't Work
Check the schedule programming in the Resideo app. Ensure there are no gaps in the schedule and that at least one event is set for each day. A corrupted schedule can cause default to hold.
Heads Up
The 'Away' feature uses geofencing and will override any schedule when enabled. Check the app's Home/Away settings to ensure you are not unintentionally in 'Away' mode, which sets a fixed temperature.