Ricoh PJ WU6181N 6200-Lumen WUXGA LCD Projector (No Lens) - Manual (Page 145)

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5. Using On-Screen Menu
Clearing the Filter Usage Hours [CLEAR FILTER HOURS]
Resets the filter usage back to zero. Selecting this option displays submenu for a confirmation. Select [YES] and press the ENTER
button.
The [OFF] item is selected for [FILTER MESSAGE] at the time of shipment. When [OFF] is selected, you do not need to clear the
filter usage hour.
NOTE: Elapsed time of the filter use will not be affected even when [RESET] is done from the menu.