American Standard ASYSTAT500C - Manual (Page 26)

26
Pub. No. 12-5029-01
69-1617
Filter Indication
Your thermostat monitors the time the fan is running
and lets you know when to replace the filter, based on
the number of fan run-time days you select. Upon
expiration, the thermostat displays Filter and the
backlight flashes during the Wake and Return modes.
To temporarily cancel the flashing
display, press
Wake
Room
Filter
System
Fan
Em Heat
Auto
AM
DST
Tue
M14576
FILTER EXPIRATION INDICATOR