tags: [] - coffee/extraction - coffee/troubleshooting aliases: - Extraction Optimisation MOC - Troubleshooting Extraction - Dialling In Guide created: 2026-04-27 updated: 2026-05-11

Extraction Optimisation & Troubleshooting MOC¶

Optimising extraction requires isolating and adjusting a small set of controllable variables — grind size, dose, yield, water temperature, and contact time — using sensory evaluation or refractometry to guide each change. The most common extraction problems map predictably to these variables: sourness indicates under-extraction, bitterness indicates over-extraction, and weakness indicates insufficient strength independent of extraction level. This MOC maps systematic optimisation methods, method-specific troubleshooting, and the diagnostic tools used across all brewing contexts.

Deep Dives¶

Article	What it covers
Extraction Optimisation	Framework for systematic extraction improvement
Over-extraction and Under-extraction	Causes, sensory indicators, and corrections
Brewing Troubleshooting	Method-agnostic troubleshooting approach
Espresso Dialling	The dialling-in process for espresso
Precision Dialling	High-precision optimisation for competition and professional use
Grind Adjustment	How and when to adjust grind size
Workflow Optimisation	Optimising consistency through workflow improvements
Equipment Optimisation	Ensuring equipment is performing to specification

Extraction Problems¶

Under-extraction: Over-extraction and Under-extraction | Sour Taste

Over-extraction: Over-extraction and Under-extraction | Bitter Taste | Bitterness

Sourness: Sour Taste | Acidity

Bitterness: Bitter Taste | Bitterness

Channelling: Channelling | Channelling and Evenness

Dialling In¶

General approach: Extraction Optimisation | Grind Adjustment | Brewing Troubleshooting

Espresso: Espresso Dialling | Precision Dialling

Measurement¶

Refractometry and TDS: Extraction Measurement | Brewing Control

Variables: Extraction Variables

Coffee Extraction Fundamentals MOC — Core extraction theory and measurement
Extraction by Brewing Method MOC — Method-specific extraction parameters
Espresso MOC — Espresso-specific troubleshooting
Brewing Methods MOC — Complete brewing technique reference
Water in Coffee MOC — Water quality and its effect on extraction
Coffee Defects MOC — Brewing defects in a broader quality context

Essential Resources¶

Books: Everything But Espresso (Scott Rao) · The Coffee Roaster's Companion (Scott Rao) · The Professional Barista's Handbook (Scott Rao)

Online: Barista Hustle troubleshooting guides · Coffee Compass · James Hoffmann dialling-in resources

Part of Coffeepedia — The Coffee Knowledge Vault

This article is part of All-About-Coffee.com - The comprehensive coffee knowledgebase.