How do I troubleshoot a blank display on my Honeywell thermostat?
Check and reset the circuit breaker if necessary. Verify the furnace power switch is on and the furnace door is closed securely. Ensure fresh AA alkaline batteries are correctly installed (see page 6). These steps address the most common causes of a blank display.
From the official Honeywell T6 Pro Smart Thermostat manual, page 8
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