Choking is a shot that barely moves: a few dark drops after fifteen seconds, or nothing at all while the pump strains. The coffee bed is resisting more than nine bars can push through.
Grind coarser. One step, then re-pull. This is the cause almost every time, and it usually follows a change — a new bag, a different roast, or a humid day.
Reduce the dose. An overfilled basket leaves no headroom, so the puck presses against the shower screen and compacts further when the pump starts. If the used puck has a screw imprint on it, the basket is too full.
Check what you are grinding for. Turkish or filter-grinder-fine is far finer than espresso needs. If you recently used the grinder for something else, reset it.
When coarser does not help
If the shot chokes even at settings that used to work, look at the machine rather than the coffee.
A blocked shower screen restricts flow before the water even reaches the puck. Take it off and soak it — a build-up of old grounds and oil is common and invisible from below.
Limescale narrows the pipework on any machine boiling hard water. This develops over years and shows up as gradually slower shots and longer heat-up times. Descale on schedule.
What choking does to the coffee
Even if the shot eventually finishes, do not drink it hopefully. Extremely long contact produces harsh, dry, astringent coffee. Dump it, adjust, and pull another — a wasted dose is cheaper than a wasted morning.
Questions people actually ask
Why did my grind setting suddenly stop working?
Beans change. A fresher bag degasses more and runs faster; the same bag three weeks later is drier and runs slower. Roast level and humidity both shift things too. Re-dialling every bag is normal, not a sign something is wrong.
Can a puck screen cause choking?
It should not, if it is clean. A clogged puck screen restricts flow exactly like a dirty shower screen. Soak it with the basket.
Last reviewed 8 August 2026