Miele S 4000 - Manual (Page 31)

Exhaust filter change indicator
Some models are equipped with an
exhaust filter change indicator (Reset
button) which is designed to alert the
user when to change the
"ActiveAirClean Plus" or "Active HEPA
Plus" filter.
The indicator will light after about
50 hours of operation which is
equivalent to about a year of average
use. The vacuum cleaner can still be
used with the exhaust filter indicator lit.
However, the suction power will be
reduced as will the effectiveness of the
filter if it is not replaced.
If a SUPER air clean filter, a , is being
used, the filter change indicator can be
disregarded but should be reset when it
does light. The indicator goes out when
the reset button is pressed.
You can replace the exhaust filter
supplied with the vacuum cleaner with
one of the other types of filters (see
"Optional accessories").
Maintenance and care
31