Grind is too fine. Adjust the grinder coarser.
- Turn the grinding adjustment dial one click clockwise while the coffee mill is running.
- Make two coffees. The effect is only visible after two cycles.
- If still too slow, repeat step 1.
If that doesn't work, the spouts could be blocked. Clean them with a toothpick.
For prevention, use the machine's rinse function regularly and ensure you're using the correct beans for espresso.