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Water under the machine

Empty the drip tray before it is full, the manual says. Then, from owners and Clive Coffee:

Drips while heating, stops when hot: the anti-vacuum valve venting until it seals. Normal.
Pours from a valve on the steam boiler: the anti-vacuum valve or safety valve, which share an outlet, sticking or weak.
From the expansion valve, or the group during a backflush: Clive links this to mains pressure that is too high, or a failed valve.
Under the left side: one owner of an original Synchronika found a loose coffee-boiler drain plug.