When the word CALC appears on the display, you must descale the coffeemaker.
Descaling instructions:
Use white household vinegar (4% acetic acid) or another descaling liquid to descale the coffee machine.
Note: Never use natural vinegar or white vinegar with an acetic acid content higher than 8%, as this may damage the inside of the coffeemaker.
Fig.1 Fig.2
Fig.3 Fig.4
Fig.5
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