CDA VC801 Installation, Use And Maintenance Manual page 37

Press the "ok" button (B9) to confirm the temperature selected.
Press the button (B6) to exit the menu.
Setting Water Hardness
The coffee maker is factory set to provide a descale warning after a
certain period of use. This can be adjusted to match your local water
hardness as follows:
Remove the "Total Hardness Test" strip (supplied with the machine)
from its packaging, dip it fully into fresh tap water for a few seconds,
then remove and wait about 30 seconds (until it changes colour and
forms red squares). Note the number of red squares visible on the
test strip.
On the coffee maker, press the Settings Menu button (B2) to enter
the menu then press the "+" & "-" buttons (B7) and (B8) to select the
"WATER HARDNESS" function.
Press the "ok" button (B9) to confirm.
Press the "+" & "-" buttons (B7) and (B8) until the number coincides
with the number of red squares on the test strip (e.g. if there are 3 red
squares on the test strip, select the message "WATER HARDNESS 3").
Press the "ok" button (B9) to confirm.
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