Perform or repeat the descaling process.
Check whether the water hardness set on the coffee machine corresponds to the actual water hardness on site.
If necessary, set the water hardness higher if there is a heavy build-up of limescale.
When setting hardness levels (1–4): 1 hardness level higher than the set hardness level
When setting degrees of hardness: 7 degrees of hardness higher than the set degree of hardness
Refer to the operating instructions for the exact procedure for setting the water hardness for your coffee machine.
A description of the procedure for setting the water hardness for various coffee machines can be found in the article “Wasserhärte einstellen (Kaffeevollautomaten)”.
After you have corrected the fault, switch the coffee machine off, wait for a moment, then switch it back on.
You can now resume using the appliance as you wish.
If the fault message still appears on the display, repeat the descaling process.
If the fault persists, please contact us or book a repair appointment online.

Miele recommends descaling coffee machines gently and thoroughly using the Miele descaling tablets that are designed for the specific appliance, see figure. Excellent care for many years of reliable service.