If your Ecobee thermostat is not working, start by performing a quick power cycle: pull the physical display unit straight off its wall mount, wait 30 seconds, and snap it back on to clear software glitches. Check that your home breaker box has not tripped and verify that the furnace door is securely closed, as safety switches will cut power to the unit. If the screen is completely blank, inspect the low-voltage fuse on your furnace control board. Verification: Check that the display turns back on and successfully communicates with your HVAC system.
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