Error Code THERMOSTAT UNKNOWN TIME

Power was lost and the time is not able to update through Wi-Fi either because the thermostat was not registered or there is poor Wi-Fi communication.

? What Causes This

Power loss occurred and the thermostat cannot sync time via Wi-Fi due to poor connectivity or lack of registration.

✓ How to Fix It

Ensure the thermostat is registered with the Resideo app.
Check Wi-Fi signal strength and connectivity.
Manually set the date and time on the thermostat if automatic sync fails.
Restart the thermostat and router if necessary.

This error code appears in:

Honeywell T10 Smart Home Thermostat