How do I reset the filter reset button for Honeywell Chronotherm IV plus?

Hope this helps...

1. Reset the timer by pressing the i key until the
expired timer is displayed.
2. Press the Timer ▲ key to reset the timer.
3. Press the Run Program key.
Note: You can view the number of days remaining at
any time by pressing the i key three or four
times. If more than one timer is active, all active
timers show sequentially when pressing the i
key several times.

if this doesn't work you can always call 1-800-468-
1502