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Coffee Grinder Troubleshooting: Static, Clogs, and Inconsistent Grinds
Fix common coffee grinder problems: static cling, inconsistent grind size, jammed burrs, and motors that will not start.
Most grinder problems come from three sources: coffee oils and fines building up in the grind path, beans or foreign objects jamming the burrs, and static electricity scattering grounds. Work through these fixes in order, unplugging electric grinders before opening anything.
Grounds cling to everything from static electricity
Static is worst with dry beans in dry air. Lightly mist beans with water before grinding, a technique known as the Ross droplet technique, using one or two drops from a spray bottle. Grinders with ionizers, like the Fellow Ode Gen 2, reduce this by design. Empty and wipe the grounds container with a dry cloth rather than washing it.
Grind size is inconsistent from cup to cup
First check that the hopper lid and adjustment ring are seated firmly; a loose upper burr shifts settings mid-grind. Then clean the burrs: retained fines from previous sessions mix into new doses. If inconsistency persists on a stepped grinder, you may be between steps, which is a design limit rather than a fault.
Grinder is jammed and the burrs will not turn
Unplug the grinder, remove the hopper, and clear beans from the burr chamber with a brush. Never adjust an electric grinder finer while it is off with beans loaded; always adjust finer while running. If a stone or foreign object is lodged, remove the upper burr per the manufacturer's guide and extract it.
Motor runs but no grounds come out
Oily dark-roast beans can cake the grind chute shut. Unplug, remove the hopper, and brush out the chute and burr chamber. Switch to a medium roast temporarily to confirm the blockage clears, then clean more frequently if you return to oily beans.
Grinder will not start at all
Check the safety interlocks: most electrics will not run unless the hopper, lid, and grounds container are fully seated. Check for a tripped thermal overload, common after grinding large batches back to back; let it cool for 30 minutes. If the outlet and interlocks are fine, the motor brushes or switch may need service.
Grind has drifted coarser over months of use
Burrs wear. Home burr sets last for hundreds of pounds of coffee, but heavy use eventually dulls them, showing up as more fines and a coarser effective grind. Replacement burr sets are available for grinders like the Baratza Encore; for sealed units, factor a new grinder into the long-term cost.
Questions, answered
How often should I clean my grinder?
Brush out the burr chamber weekly and deep-clean monthly if you brew daily. Oily dark roasts need more frequent cleaning than light roasts. Never wash burrs with water; use a dry brush or grinder cleaning tablets.
Is it safe to adjust the grind while the grinder is running?
Yes, and for finer adjustments it is required: adjusting finer while beans sit between stationary burrs is what causes jams. Adjust coarser any time; adjust finer only while running.
Why does my grinder smell like burning?
A hot or burning smell during long grinding sessions means the motor is overheating. Stop, let it cool for 30 minutes, and grind in shorter batches. Persistent smell under normal use indicates a failing motor.
Can I grind spices in my coffee grinder?
Not in a burr coffee grinder: hard spices can chip burrs and leave flavors that contaminate coffee for weeks. Keep a separate cheap blade grinder for spices.