White Rodgers SuperStat Pro Programmable Thermostat - Manual (Page 16)

14 SuperStat Pro User Guide
Resetting the FLTR Display
If FLTR appears in your thermostat display, this is a reminder that you need to change or clean the filter in your heating
and cooling system. After you change or clean the filter, you can reset the display so FLTR no longer appears.
Quick Guide Description Thermostat Display
Press both
buttons at the
same time. Press the
RUN and HOLD buttons at the same time.
The FLTR display no longer appears on the thermostat.