Honeywell T8635L1013 Owner's Manual - Page 23

Filter Indicator 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 green LED lights (on the top right of the thermostat). One fan run-time day equals twenty-four 60 70 80 90 hours of fan run time. For example, if the 60 70 80 90 fan is on only one-third of the time each day, it takes three days to deduct one fan run-time day. Setting or Resetting Filter Indicator Your thermostat comes preset to a 30-day setting. To change this setting, or reset after filter expiration: 1. Press Filter key to enter the Filter mode. Filter Filter Tue Wake AM Room DST FILTER EXPIRATION INDICATOR System Em Heat Fan Auto M17760 Setting Filter Days Press the Filter key to display filter information. Example display shows current fan run time set to 30 days with the filter set to expire in 5 days. M14577 23 69-1332-4