What does the air filter reminder alert mean on my Honeywell thermostat?
The air filter reminder appears when the filter needs replacement. Press Menu, navigate to ALRT, and Select to view the alert. You can snooze the reminder for 7 days or clear it after changing the filter. Resideo recommends changing the air filter before clearing the reminder. (Page 7)
From the official Honeywell T4 Pro Thermostat manual, page 7
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