Espresso Troubleshooting – Sour, Bitter, Channeling

Almost every espresso fault has a clear cause – and a simple fix. Instead of guessing wildly, work systematically: taste first, then change one variable. This troubleshooting overview gets you back to the sweet spot fast.

Sour and thin

Sour almost always means under-extracted: too little dissolved. Causes: grind too coarse, shot too fast, water too cool or dose too low. Fix: grind finer until the shot takes longer – the sourness usually disappears.

Bitter and dry

Bitter usually means over-extracted: too much dissolved. Causes: grind too fine, shot too long, water too hot or old/burnt roast. Fix: grind coarser and shorten the shot time.

Runs too fast or drips

Always change just one variable and re-taste.

• Too fast (under 20 s): grind too coarse → finer.
• Dripping / no flow: grind too fine or dose too high → coarser or dose less.
• Uneven/spritzing: channeling → improve puck prep (WDT).

Troubleshooting chart

This chart solves 90% of everyday problems.

• Sour → grind finer
• Bitter → grind coarser
• Too fast → grind finer
• Dripping → grind coarser
• Sour AND bitter at once → channeling, check puck prep
• Thin, pale crema → beans old or water too cool

When nothing helps

Check the basics: fresh beans (1–4 weeks past roast), a clean machine, even puck prep and suitable water. Often it is not the recipe but one of these foundations.