How do I set up an air filter replacement reminder on the T6 Pro?
In the Installer Setup (ISU), use ISU parameter 702 to set the number of air filters (0–2), then configure ISU 711 (Air Filter 1) and/or ISU 712 (Air Filter 2) with your preferred reminder interval. Reminder options range from 10 run-time days up to 15 calendar months, or can be turned off entirely. (Page 10)
From the official Honeywell Home T6 Pro Th6320u2008 manual, page 10
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