When a residential power outage occurs, an Ecobee smart thermostat will immediately power down completely, turning off its display screen, disconnecting from home Wi-Fi, and ceasing all heating and cooling calls because it relies entirely on continuous 24V power supplied by the HVAC furnace transformer. Once grid power is restored, the Ecobee will automatically reboot, reconnect to your local wireless network within a few minutes, and resume your programmed schedule without losing user settings. Verification: Observe the thermostat screen light up and reconnect to Wi-Fi automatically once electricity returns to the home.
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