Water comes out of the portafilter when I am just trying to prime it.

When I try to prime my machine water not only comes out of the steam wand but out of where the portafilter goes too. In the past when I prime these machines water only comes out the steam wand. The brew button is turned off as it should be. Can anyone help me?

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Not really familiar with these units but you may want to look at the following to see if anything there is of help. As a rule, water coming out of somewhere it's not supposed to is usually indicative of a seal, connection malfunction or cracked component.

Starbucks Barista Repair

How to Repair an Internal Leak in the Steam Wand of a Starbucks Barista