Frage alarm message snowflakes + droplets / Schneeflocke + Tropfen ?

Hello everybody. Does anyone know what the "snowflake with droplets" alarm message means .. I attach photos.   Thanks!

Refrigerator has a temperature greater than 20 degrees

No i think. I'm at 1600m a.s.l. , but last night I had turned off the fridge and then turned it on again, perhaps it was at this moment that the snowflake appeared, then the alarm light disappeared.

Based on what the manual says, @ulist is correct.
If your fridge didn't have >20°C then the temperature sensor may be defective. This is a well-known problem, unfortunately. Try search for "Temperaturfühler Kühlschrank" in this forum and in nuggetforum.de. 

It is possible to read fridge temperature on the display.
Using 3 button press to access service menu.
Select Heating symbol
Scroll through menu and you can see the temperature of the 3 sensors.
Kitchen Bathroom and Fridge.
You can then compare to actual temperature using a manual fridge thermometer next to the sensor in the fridge.
Apologies for using English but I live in Ireland.