Extraction

Most espresso problems have simple causes. If your shot tastes wrong, the issue is almost always grind size, dose, or temperature — not your machine. This guide covers the most common espresso problems with their causes and fixes, organized so you can diagnose quickly and adjust confidently. The Quick Diagnostic Chart Symptom Most Likely Cause First Fix to Try Sour, acidic, sharp taste Under-extraction Grind finer Bitter, ashy, harsh taste Over-extraction Grind coarser Watery with no crema Stale beans or too coarse Use fresh beans, grind finer Shot runs in under 15 seconds Grind way too coarse Grind significantly finer Shot takes over 45 seconds Grind too fine or channeling Grind coarser, check puck prep Thin, blonde crema Under-extraction or stale beans Grind finer, check bean freshness Spraying/spurting from portafilter Channeling (uneven puck) Improve distribution and tamping Different taste each time Inconsistent variables Weigh dose and yield every shot Sour Espresso (Under-Extraction) A sour shot tastes sharp, acidic, and often thin or tea-like. The flavors are bright but unpleasant, without sweetness or body. This is the most common problem for beginners. ...

The espresso ratio is the relationship between how much dry coffee you use (dose) and how much liquid espresso you get out (yield). Expressed as dose:yield, the standard espresso ratio is 1:2 — 18g of coffee in produces 36g of espresso out. Understanding espresso ratios is the fastest way to improve your shots and troubleshoot problems. Once you know the ratio framework, you can adjust any variable with confidence instead of guessing. ...