If your Emerson Sensi Touch thermostat is completely blank and not turning on, begin by checking the power supply. Verify that your HVAC circuit breaker has not tripped and that the furnace emergency switch is on. Next, check the low-voltage fuse on your furnace control board and inspect the wall backplate to ensure wires are securely clamped. Callout type="warning" title="Electrical Safety Warning": Turn off power at the main circuit breaker before inspecting or touching low-voltage wiring. Verification: Confirm that the display screen lights up and the device boots successfully.
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