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