Procedure depends on your filter type.
- For a standard white filter (OB03): Press and hold the STATUS button for 2 seconds. Release. All lights blink twice simultaneously, then the green STANDARD FILTER light blinks three times by itself.
- For a blue LONGLAST filter (OB06): Press and hold the STATUS button for 6 seconds. Release only after the green LONGLAST FILTER light has blinked green three times by itself.
This must be done after every filter replacement. The indicator will not reset automatically.
If you select the wrong mode, repeat the process until the correct light sequence confirms the mode matching your installed filter.