Common issues reported with the Ecobee3 Lite include power starvation errors caused by the lack of a dedicated C-wire (which can lead to random reboots or Wi-Fi dropouts if power-stealing fails), occasional disconnects from 2.4 GHz Wi-Fi routers after firmware updates, and thermostat screen unresponsiveness due to static or dust accumulation. Utilizing the included Power Extender Kit (PEK) or installing a dedicated C-wire resolves most power-related faults.
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