Miele KF 1801 SF Operating And Installation Manual page 40

Frequently asked questions
Problems with temperature
Issue
The freezer section is
too warm.
The temperature display
for the freezer shows
-18°C, although I have
set a higher
temperature.
40
Possible fault
The room temperature is
lower than the ambient
temperature for which the
appliance is designed.
This is not a fault. If the ice maker is turned on while
the ambient temperature of the room is (<+18 ° C), a
temperature of -18°C is automatically displayed. Only
then will the ice maker function properly.
Solution
Raise the temperature of
the room.
Operating the appliance
in a room that is too cold
will cause the cooling
system to switch off for
too long, causing the
freezer section to become
too warm.