Make sure the swinging arm at the top of the brew unit moves easily. Check nothing on the brew unit is damaged. Servicing the brew unit might help.
Brew Unit
The transmission can wear out prematurely due to the brew unit becoming
stiff. The piston in the brew unit should move smoothly and fairly
easily. Keep the brew unit in good service by occasionally removing the
piston to clean and re-grease the two big red o-rings using a food-safe
grease. To pop the piston out the top, gently remove the plastic u-clip
from the base of the shaft underneath, paying attention to which way up
it goes for reassembly.
Thank you. I had this problem on the ESAM4200. The grounds were suddenly muddy and would spill inside the machine. While I could not entirely get the piston out of the brew unit on my model, I thoroughly cleaned the brew unit with vinegar (oops) and hot water. I also descaled the machine, just in case. Pucks are back to normal and the machine stays clean.
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