Espresso Grinder Not Grinding? Jams, Feeding & Fixes (Any Machine)

On a machine with a built-in grinder — a Breville Barista Express or any bean-to-cup automatic — the grinder is the part that most often seems to “fail.” The good news: it’s rarely the burrs themselves. Far more often the beans aren’t reaching the burrs (they bridge), something that isn’t a bean has jammed them, or the grind setting is off. This guide covers the universal fixes; for your model’s exact steps, jump below.

The golden rule first

On most machines with an adjustable built-in grinder, only change the grind setting while the grinder is actually running. Adjusting it when stopped can damage the burrs. Keep that in mind and the grinder will run for years.

What’s actually happening?

Grinder spins, little/no coffee → beans bridging or empty hopper.
Loud rattle / grinding noise → a foreign object jammed in the burrs.
Grinds fine but no coffee brews → clogged chute or brew unit.
Weak/fast or choked shots → grind setting (see the grind size guide).

The usual causes (any machine)

Bean bridging — oily/stale beans arch over the opening; shake the hopper, use fresher beans.
Empty or unseated hopper — refill; make sure it’s locked in (some have a safety switch).
Foreign object jam — a stone or debris; power off, empty, and clear the burrs.
Grind too fine — clogs the chute; coarsen (while running).
Clogged chute / brew unit — grinds stick on the way to the puck; brush it clear.

Find your machine’s exact steps

(Machines without a built-in grinder — the Bambino, Dedica, Gaggia Classic Pro — rely on a separate grinder; for those, weak or choked shots come down to that grinder’s setting and your dialling-in.)

Common mistakes

Adjusting the grind while the grinder is stopped — the one thing that damages burrs.
Putting pre-ground or non-beans in the hopper.
Running very oily dark roasts without shaking the hopper or wiping the oil.
Assuming the burrs are dead before clearing feeding and jams.
Never cleaning the chute or brew unit, so grinds block the flow.

Fix it for good

Use fresh, less-oily beans, keep the hopper lid on, shake it if beans bridge, and only adjust the grind while it runs. Clean the chute and burrs periodically, and keep only roasted beans in the hopper. To understand how grind drives shot quality, see the grind size guide — then follow your model’s steps above.

Frequently asked questions

Why is my espresso grinder not grinding?

The most common reason is beans not feeding — oily or stale beans 'bridge' and form a gap above the burrs so the grinder spins without catching them. Shake or stir the hopper, refill it, and switch to fresher, less oily beans. If you hear a loud rattle or grinding noise, a foreign object (a stone or something other than a bean) may be jammed in the burrs and needs removing. An empty hopper or a hopper not seated also stops grinding on many machines.

The grinder runs but no coffee comes out — why?

Either no beans are reaching the burrs (bridging or empty hopper), the grind is set so fine it's clogging the chute, or the ground coffee is stuck on its way to the portafilter or brew unit. Shake the hopper, set the grind a little coarser, and clear the grinds chute with a brush. On bean-to-cup machines, a brew unit clogged with old grounds can also block coffee even when the grinder works.

Why is my grinder so loud or rattling?

A new, louder-than-usual rattle almost always means a foreign object is caught in the burrs — a small stone or debris that came in with the beans. Turn the machine off, empty the hopper, and clear the obstruction (vacuum it out and follow your model's burr-cleaning steps). This is exactly why only roasted coffee beans should ever go in the hopper — never pre-ground, sugar, or flavoured additives.

Can I put pre-ground coffee in the bean hopper?

No — never put pre-ground coffee or anything but plain roasted beans in the hopper; it jams the grinder and can damage the burrs. Many machines with a built-in grinder have a separate bypass/chute for pre-ground — use only that. If your machine has no bypass and you want to use pre-ground, you'd need a machine that accepts it; forcing it through the hopper will cause problems.

Why do my beans keep getting stuck (bridging)?

Bridging is when oily or sticky beans clump and arch over the grinder opening so none drop in. Very dark, shiny roasts are the worst offenders. Tap or shake the hopper to break the bridge, keep it reasonably full, prefer fresher and less oily beans, and wipe oily residue from the hopper now and then. Keeping the hopper lid on also helps beans stay dry and free-flowing.