44043-01 • 02/19/2010
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Operation
Filter Monitor
The thermostat counts the number of hours your system’s
lter has been in use. To maximize your system’s
performance and energy efciency, change or clean your
lter regularly.
When the total system run time for heat and cool reaches
400 hours, the Filter Change Indicator will ash as a reminder to check your
system’s lter.
After changing or cleaning the system lter, press and hold the Filter key for 3
seconds. The display will blink, and the counter will be reset to zero.
Note: Pressing the Filter key at any time for less than 3 seconds will cause the Filter
Change Indicator to appear on the LCD. This is only to conrm key operation,
and the counter is not affected unless the key is held for greater than 3 seconds.
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