To determine if your Ecobee hardware is genuinely defective, first verify that it is receiving a steady 24-volt AC current from the R and C wires using a multimeter. If proper power is confirmed at the wall plate but the unit refuses to boot, shows a dead screen, or fails to send signals to the furnace even after a factory reset, the internal hardware has likely failed. Verification: Confirm stable voltage input alongside a complete lack of response from the display unit.
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