Miele CVA 3660 Operating And Installation Instructions page 73

. . . the coffee is too weak.
^ Make sure the amount of water programmed is not too
much for the coffee.
^ Check to see how many coffees have already been
dispensed.
If the amount of water is correct and 15,000 coffees have
already been dispensed you will need to replace the
capsule hopper in the brew unit. See "Cleaning and care:
Maintenance".
. . . there is water in the waste container.
This is not a fault. The water is left over from the brewing and
cleaning process.
. . . there is residual "coffee water" in the waste container.
The capsule plate is not pushed in correctly.
^ Remove the capsule plate and replace it.
. . . the descaling programme was started by mistake.
The descaling programme cannot be cancelled once you
have touched the OK sensor. The programme has to be
completed through to the end. This is a safety measure to
ensure that the machine is fully descaled, and is important for
the long-term protection of the machine and to ensure it
functions correctly.
. . . the heating-up time is getting longer, the amount of
water coming through is incorrect and the machine is not
performing properly.
The machine needs descaling.
Problem solving guide
73