Honeywell International Inc. T8665E Manuale Utente

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Your thermostat monitors the amount of 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. On expiration, 

thermostat displays “Filter.”

One fan run-time day equals 24 fan run-time 

hours. (If fan is on only one-

third of the time each day, it 

takes three days to deduct 

one fan run-time day.)

Your thermostat comes preset to a 30-day 

setting. To change this setting or reset after 

filter expiration:

1. Press Filter key to enter Filter 

mode. 

Press Filter key to display filter information. Example 
display shows current fan run time set to 30 days with 
filter set to expire in five days.

2. Press and hold Filter key for 

at least three seconds to 

reset fan run time.

FILTER EXPIRATION INDICATOR

Wake

Room

Filter

Em Heat

Auto

DST

Tue

M20899

M14577