How do I set up an air filter replacement reminder on the T6 Pro?
In the Installer Setup (ISU), navigate to ISU #702 to set the number of air filters (0–2), then use ISU #711 and #712 to configure replacement reminders for each filter. Reminder intervals range from 10 run-time days up to 15 calendar months, or can be turned off. (Page 10)
From the official Honeywell T6 Pro manual, page 10
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