Coffee machine

Hello, since a few days our coffee machine can jump the FI switch. First we thought it was the socket, meanwhile I noticed that it happens when I set to latte macciato... the machine foams the milk and at half the milk comes at once the fuse. With only -coffee- brew nothing happens. Machine is from Delonghi Dynamika. Approx. 3 years old....
Does anyone have an idea what this can be?

Vg

Steam heating is probably defective.
You can check this with a multimeter. But this should be done by a professional.

MfG Chris

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Leakage in the machine. You won't be able to tell much without opening it.
The exact type would also be helpful. It is written on the bottom of the machine.