ESPRESSO TROUBLESHOOTING / SYMPTOM INDEX
The symptom,
then one test.
Sour, bitter, conflicting, too fast, or stalling—each espresso troubleshooting guide gives the direct answer, the evidence boundary, and one next experiment to run.
These guides translate measured recipe inputs and your own taste or flow observations into a conservative next experiment. They do not measure extraction yield, see the puck, detect channeling, or test your equipment.
START WITH WHAT YOU TASTED
5 symptoms. 5 different first moves.
A measured way to diagnose sour espresso without treating 30 seconds as a guarantee or changing every variable at once.
Updated 2026-07-22Open the field guide →02 / BITTERHow to fix bitter or harsh espresso one change at a timeUse flow, time, yield, and roast context to choose a controlled next experiment for bitter espresso.
Updated 2026-07-22Open the field guide →03 / CONFLICTING SIGNALSWhen espresso tastes sour and bitter at the same timeWhy conflicting flavors point to an evenness check before another blind grind adjustment.
Updated 2026-07-22Open the field guide →04 / FAST FLOWEspresso shot running too fast: the next useful testA fast shot usually calls for more resistance, but only when dose and yield are measured and preparation is repeatable.
Updated 2026-07-22Open the field guide →05 / SLOW FLOWEspresso shot running too slow or stallingReduce resistance with one controlled coarser-grind test while holding dose and beverage yield constant.
Updated 2026-07-22Open the field guide →RUN IT ON YOUR OWN NUMBERS
A guide narrows the cause. The tool prints the next shot.
- Shot Lab
Enter the dose, yield, and time you measured, plus the flow and taste you observed. Shot Lab prints one next change, what to hold constant, and what the recommendation cannot establish.
Open Shot Lab → - Ratio calculator
Check the recipe itself before blaming the grind: dose in, beverage mass out, and the ratio the two describe.
Check the ratio →