How do I clear or snooze an air filter replacement reminder?
Press Menu, navigate to ALRT, and press Select to view the alert; the message REPL (Replace Air Filter) will appear. To snooze, press Select and then Select again to delay the reminder by 7 days. To clear it, press Select, navigate to CLER, and press Select — Honeywell recommends changing the air filter before clearing the reminder. (Page 7)
From the official Honeywell T4 Pro Programmable Thermostat (TH4110U2005/U) manual, page 7
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