Miele HS15 Operating Instructions Manual page 16

Preparing for use
^ Press the reset button ~ for the
exhaust filter change indicator.
^ A narrow red strip will appear on the
left edge of the display field after
10 - 15 seconds.
^ Close the dust compartment lid
securely, making sure it clicks into
position. Take care not to trap the
dustbag when doing so.
How the exhaust filter change
indicator works
The exhaust filter change indicator
shows the usage life of the exhaust fil-
ter. After approx. 50 operating hours,
which equates to average use over one
year, the red display field will be
completely red.
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