Philips WP3822 User Manual page 17

 The water purifier starts counting down the remaining filter
capacity as soon as you use the water purifier at the filtered spray
setting.
How to reset the filter capacity
Note: Always reset the filter capacity when you replace the filter cartridge.
This is necessary to set the remaining filter capacity back to its initial value
(i.e. 2500, 1500 or 900 litres).
1 Press the reset button for 2 seconds.
The previously selected filter capacity flashes on the display for a
,
few seconds.
 If the new filter cartridge has the same capacity, simply wait until
the setting stops flashing.
 If the new filter has a different capacity, press the filter capacity
selection button and keep it pressed until the display shows the
new filter capacity. Then release the button.
The selected filter capacity flashes on the display for 4 seconds and
,
is then shown continuously for 5 seconds to indicate that the
selected setting has been set.
Replacing the battery
The battery lasts approximately one year in case of normal domestic
use. Replace the battery when the à symbol lights up and flashes. This
appliance runs on 1 button-type CR2032 (3V) lithium battery, which is
generally available.
1 Remove the water purifier from the tap.
 Wipe the entire water purifier with a dry cloth.
 Place the new battery (see 'Inserting the battery' in chapter
'Preparing for use').
 Reattach the water purifier to the tap (see the installation
instructions for your adapter type in chapter 'Preparing for use').
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