Bosch 283UC Use And Care Manual page 11

When and how to descale your coffeemaker
On average, you should descale every three months,
depending on the hardness of your water, or when
the following conditions occur:
- the time required to make the coffee becomes
longer
- an excessive amount of steam is generated
- the coffeemaker becomes noisier
- the coffeemaker switches off prematurely
1. Pour descaler into the water tank in accordance
with the descaling product manufacturer's in
structions.
2. Press the button ON and after 1 minute press
the button OFF. Leave the solution to react for
10 minutes. Repeat this procedure at least three
times (depending upon the amount of scale that
has formed).
3. Switch the coffeemaker on again and let the
remaining solution run through.
4. Run 9 cups of clean water through the
coffeemaker twice.
5. Finally, unplug the coffeemaker, clean it and
thoroughly rinse all detachable parts.
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