How do I set up an air filter replacement reminder on the T6 Pro?
In the Installer Setup (ISU), set ISU 702 to configure the number of air filters (0–2), then use ISU 711 and/or ISU 712 to set the replacement reminder interval. Reminder options range from as few as 10 run time days up to 15 calendar months, or can be turned off entirely.
From the official Honeywell T6 Pro TH6210U2001 Smart Thermostat manual, page 10
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