What should I do when the air filter reminder alert appears on my thermostat?
Press Menu, navigate to ALRT, and press Select to view alerts. When REPL (Replace Air Filter) appears, you can snooze the reminder for 7 days or clear it. Resideo recommends changing the air filter before clearing the reminder. Some alerts cannot be snoozed and may require service from a heating/cooling professional.
From the official Honeywell T6 Pro Smart Thermostat manual, page 7
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