An Ecobee thermostat typically stops working due to an interrupted power supply, a tripped circuit breaker, a blown 3A or 5A fuse on the furnace control board, or a loose wire terminal connection (especially concerning the required C-wire). Software freezes or outdated firmware can also cause temporary unresponsiveness. Verification: Inspect the furnace control board fuse and ensure all terminal wires are locked tightly.
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