How do I respond to an air filter reminder alert on the thermostat?
When the alert icon appears, press Menu and navigate to ALRT, then press Select to see the REPL (Replace Air Filter) message. You can snooze the reminder for 7 days by selecting SNZE, or clear it entirely by navigating to CLER and pressing Select. Honeywell recommends changing the air filter before clearing the reminder. (Page 7)
From the official Honeywell T6 Pro Smart Thermostat manual, page 7
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