Here is the manual:
http://www.delonghi.com/Global/InstructionManuals/EN/ESAM5600%20Intro%20EN.pdf
Two causes from the troubleshooting section:
The froth regulator is incorrectly adjusted. • Adjust following the instructions in the section on preparing drinks with milk.
The milk container lid is dirty. • Clean the milkcontainer lidasdescribedin the section "Cleaning the milk container".
Two O-Rings. A small Black one and a larger Orange one.
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