Learn from Mistakes — Beginner's Guide to Fixing Sourdough Problems

What to Expect

This page teaches you a simple, repeatable method to diagnose why a sourdough loaf failed and how to change one variable at a time so the next bake is better. Learning systematic troubleshooting reduces wasted loaves and speeds progress.

What you'll learn:

✓ How to inspect crumb, crust, and dough behaviour to identify causes
✓ Which single variable to change next (starter, time, temperature, hydration)
✓ Quick fixes you can apply to a current loaf and planned experiments for the next bake

💭 You will still make mistakes — that's the fastest way to learn. Expect to iterate 3–6 times before consistently producing the loaf you want.

🛒 Recommended Products

We recommend the following tools for this recipe:

🔧

Digital Kitchen Scale

Essential for accurate measurements and diagnosing hydration issues

View on Amazon →

🔧

Glass Jar for Starter

Watch starter activity to check strength and timing

View on Amazon →

🔧

Instant-Read Thermometer

Check internal crumb temperature to avoid underbaking

View on Amazon →

As an Amazon Associate we earn from qualifying purchases. Links are affiliate links.

What You Need

Must have:

Active sourdough starter

Visible rise in a glass jar within 4–8 hours after feeding [1]

⚠️ Create or refresh your starter first → more

Kitchen scale

Accurate to the gram; essential for tracking variables

⚠️ Acquire a scale before attempting controlled experiments

Notebook or log

Record timings, temperatures and observations for each bake

⚠️ Start a simple bake log → more

Nice to have:

• Instant-read thermometer to check oven and crumb temperatures
• Dough scraper to handle and inspect dough
• Proofing basket to see dough structure after shaping

Why a diagnostic-first approach works

Change one variable at a time

Isolating a single change (starter amount, proof time, temperature, hydration) makes cause-and-effect clear, which is faster than random tweaks [1]

Use objective checks

Simple tests — float test, poke/press test, internal temperature — are reproducible and remove guesswork [1][2]

Keep conditions consistent

Same flour, same scale, same oven setup reduces noise in your experiments and reveals the true effect of a variable [2]

Ingredients

For: This page focuses on variables not a recipe

Starter maturity	Active or underactive	Starter strength changes proof times dramatically; use a [glass jar](https://amzn.to/4pWAN8D) to monitor rise [1]
Hydration	Expressed as % of flour weight	Higher hydration yields more open crumb but is harder to handle; weigh with a [kitchen scale](https://amzn.to/4pUMVHi) [2]
Time and temperature	Bulk and final proof times	Warmer equals faster fermentation; cool retardation slows but develops flavor [1][2]
Oven setup (steam)	Dutch oven or steam method	Steam supports oven spring — use a [Dutch oven](https://amzn.to/4sVhKhN) or other covered method for reliable results

Step by Step

Inspect the failed loaf, record objective signs, pick one variable to change, run a controlled repeat

Document the loaf immediately

Right after cooling

Photograph crumb and crust, note bake time, oven temp, starter feeding schedule, and proof times in your log. Record internal temperature with an instant-read thermometer.

✓ A clear record lets you compare bakes objectively

💡 Write down the exact flours and weights from your kitchen scale

Inspect crust and crumb

Look for glossiness (undercooked), large collapsed air pockets (over-proofed), dense uniform crumb (under-proofed or low hydration). Note crust color for baking time.

✓ Match observations to common causes below

💡 Slice only after 1–2 hours cooling; premature slicing hides the true crumb structure

Run simple tests

Float test for starter strength: small spoon of starter in water should float if active [1]. Poke test for proofing: dough should spring back slowly.

✓ Float and poke tests give objective readiness signals

💡 If starter fails float test, refresh for 1–2 feeds before major bakes

Choose one variable to change

Based on inspection, change only starter amount/timing OR proof time OR hydration OR bake time/temperature OR steam method for the next bake.

✓ Plan the single change in your log and keep other variables identical

💡 Small adjustments (5–10% hydration, 30–60 min proof) are safer than large jumps

Repeat and compare

Bake the adjusted loaf and compare photos and logs. Repeat another single change if needed.

✓ You should see a directional improvement after 1–3 controlled iterations

💡 Rely on objective measures (internal temp, crumb holes, spring) rather than subjective impressions

What If It Doesn't Work?

Common problems, likely causes and practical fixes — use these as a checklist during diagnosis:

Flat, dense loaf with little rise

Likely: Weak starter, cold dough, or under-proofed

Fix: Ensure starter is active (float test), increase bulk fermentation time or warmer environment, or feed starter more before use. Try 25% more active starter or 30–60 min longer bulk at ~24°C [1][2]

→ More info

Huge uneven holes and collapsed top

Likely: Over-proofed or too much steam reduction late in bake

Fix: Shorten proof (cool retard reduces risk), score properly and bake in a covered vessel for stable steam early, then remove lid for crust formation [1][2]

→ More info

Gummy, under-baked crumb

Likely: Insufficient bake time or too high hydration without sufficient oven heat

Fix: Bake until internal temperature ~98–99°C (208–210°F) or add 5–10 more minutes; use an [instant-read thermometer](https://amzn.to/49Xsgwp) and a preheated [Dutch oven](https://amzn.to/4sVhKhN) for consistent oven spring [2]

→ More info

Very sour flavor

Likely: Excessively long fermentation or too much rye/whole grain at warm temps

Fix: Shorten fermentation, lower fermentation temperature, or reduce starter percentage. Cold retard (refrigeration) for flavor control [1][2]

→ More info

Loaf didn't open / poor oven spring

Likely: Poor scoring, tight skin, or under-proofed

Fix: Score confidently (use a [bread lame](https://amzn.to/3LKDRH0)), ensure dough surface is taut at bake time, and bake in a steamy environment (covered [Dutch oven](https://amzn.to/4sVhKhN))

→ More info

💪 Most loaves that seem "failed" are still tasty and teachable. Keep a short log and you'll see consistent improvement quickly [1][2].