Determining whether an Ecobee smart thermostat has failed involves checking for chronic hardware symptoms such as persistent reboot loops, unresponsiveness on the glass touchscreen, Wi-Fi radios that constantly drop connection despite router restarts, or severe temperature sensor calibration drift exceeding several degrees. Additionally, if the unit displays continuous low-voltage power errors even with a verified C-wire, internal power circuits may be damaged. Verification: Check technical voltage and power metrics in the thermostat settings menu to confirm if internal components are operating normally.
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