Miele FNS 37402i Operating And Installation Instructions page 46

Problem solving guide
Messages in the display
Message
The power symbol 
flashes in the display
and the warning tone
sounds.
The temperature display
will show the warmest
temperature recorded in
the freezer during a
power failure or an
interruption to the
power supply.
46
Possible cause and remedy
Indication of a power failure: The temperature in the
appliance over the last few days or hours has risen
too high because of a power cut or an interruption to
the power supply.
The appliance will go back to the last temperature
setting when the power is back on.
 Touch the alarm off sensor.
The display of the warmest temperature recorded in
the freezer will disappear. The display will then revert
to showing the current temperature in the freezer
section.
 Depending on the temperature displayed, you
should check whether food in the freezer has
started to thaw or has defrosted. Check that it is
still safe to use and, if so, use it as soon as
possible. Defrosted food may only be refrozen
after it has been cooked.