How do I clear or snooze the air filter replacement reminder?
Press Menu, then press the down arrow until ALRT is displayed. Press Select to view alerts, and the message REPL (REPLACE AIR FILTER) will appear. To snooze for 7 days, press Select and then Select again. To clear the reminder, press Select, then the down arrow to go to CLER (Clear), and press Select. Resideo recommends changing the air filter before clearing the reminder.
From the official Honeywell T6 Pro Thermostat manual, page 7
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