Bosch TKA 9110 UC Use And Care Manual page 12

When and how to descale your coffeemaker
12
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. Screw the lid into the thermal carafe and place it
onto the coffeemaker.
2. Pour descaler into the water tank in accordance
with the descaling product manufacturer's in
structions.
3. Press the ON button and after 1 minute press
the OFF button. Leave the solution to react for
10 minutes. Repeat this procedure at least three
times (depending upon the amount of scale that
has formed).
4. Switch the coffeemaker on again and let the
remaining solution run through.
5. Run 6-7 cups of clean water through the
coffeemaker twice.
6. Finally, unplug the coffeemaker, clean it and
thoroughly rinse all detachable parts.