Symbol 5596 from IEC 60417 - Title/Meaning: Condensate collector, full Function/description: To indicate that the condensate collector, for instance in a dryer, is filled.
Additional information: 
Published in: Supplement N, 1995,3C(Central Office)192
Own work using: iso.org/obp/graphics/grs/c9fefa07-403f-4805-81ec-920cd39f8157 200.png
Vectorization:  Mrmw