Hi
The drain in the back of the machine is plugged with coffee residue. There is a pocket below the injection tube ( the one with the 2 o-rings on it) that is filled with coffee residue that needs to be cleaned out. When its clean and you put water in the pocket it should come out the drain hole into the drip tray. The pocket is where the brew unit relieves the pressure when it is done brewing. That is why you get coffee residue in the pocket.
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