You pulled your loaf out of the oven, cut into it, and… something’s off. Maybe it’s flat as a pancake. Maybe the middle looks raw and gummy. Maybe it tastes like nothing at all. If you’ve been baking sourdough for any length of time, you already know this bread has a mind of its own, and it will humble you when you least expect it.
The good news here is almost every sourdough failure traces back to one of a handful of usual suspects!
Table of Contents
- Your Diagnostic Chart: Match Your Problem to the Cause
- Your Starter Is Probably the First Place to Look
- Problem: Dense, Heavy, Gummy Crumb
- Problem: Flat Loaf That Spreads Instead of Rising Up
- Problem: No Oven Spring at All
- Problem: Gummy or Underbaked Center
- Problem: Big Holes or Tunneling Near the Top Crust
- Problem: Pale or Soft Crust
- Problem: Flavor Is Bland or Overly Sour
- A Simple Troubleshooting Checklist Before Your Next Attempt
- When It's Time to Simplify Your Process
- FAQ
Your Diagnostic Chart: Match Your Problem to the Cause
| What You’re Seeing | Most Likely Cause | Fastest Fix |
|---|---|---|
| Dense, gummy crumb | Underproofed dough or weak starter | Extend bulk fermentation, feed starter more consistently |
| Flat, spread-out loaf | Overproofed dough or slack gluten | Shorten proof time, tighten shaping |
| No oven spring | Dead or sluggish starter, oven too cool | Test starter float, preheat longer |
| Gummy or wet interior | Underbaked or sliced too early | Bake longer, cool fully before cutting |
| Big irregular holes (tunneling) | Poor shaping, too much steam early on | Shape tighter, adjust steam timing |
| Pale, soft crust | Oven too cool or not enough steam | Increase temp, add steam for first 15-20 minutes |
| Burnt bottom, pale top | Baking vessel too close to heat source | Move rack up, use a baking stone or double pan |
| Sticky dough that won’t hold shape | Too much hydration for your flour | Reduce water by 5-10%, strengthen gluten with folds |
| Bland, flat flavor | Fermentation too fast or too short | Slow it down with a cooler proof or longer bulk |
| Sour, almost vinegary taste | Overfermented dough or starter too acidic | Shorten fermentation, refresh starter more often |
Your Starter Is Probably the First Place to Look
Before blaming your technique, check the engine driving the whole process. A weak or inconsistent starter causes more sourdough disasters than anything else.
Signs your starter needs attention:
- It takes more than 8-10 hours to double after feeding
- It smells like nail polish remover or acetone (a sign it’s hungry and over-fermented)
- It doesn’t pass the float test (a spoonful dropped in water sinks instead of floating)
- It looks watery with a thin gray liquid on top for days in a row
To get it back on track, feed it consistently at the same ratio (1:1:1 by weight of starter, flour, and water is a solid starting point) twice a day for 3-4 days. Keep it somewhere warm, around 75-80°F, and watch for it to double reliably within 4-6 hours.
That’s your green light that it’s ready to leaven a loaf.
Problem: Dense, Heavy, Gummy Crumb
This is the most common complaint, and it almost always comes down to timing or starter strength.
What’s happening: The dough hasn’t fermented long enough to build the gas structure that gives bread its open, airy texture. Or your starter simply wasn’t active enough to do the job.
How to fix it:
- Confirm your starter passes the float test before mixing dough.
- Extend bulk fermentation. Look for the dough to grow by 50-75% in volume, not just “a couple hours passing.”
- Keep your dough warmer during bulk fermentation, ideally 75-78°F. A cold kitchen slows everything down without you realizing it.
- Do a poke test: press a finger into the dough. If it springs back slowly and leaves a slight indent, it’s ready. If it springs back instantly, it needs more time.
Problem: Flat Loaf That Spreads Instead of Rising Up
What’s happening: This usually points to overproofing (the gluten structure has broken down and can’t hold its shape) or weak shaping technique that left the dough without enough surface tension.
How to fix it:
- Pull back your bulk fermentation time by 30-60 minutes and watch the dough instead of the clock.
- Tighten your shaping. Use the bench to build tension by dragging the dough toward you in a circular motion until the surface feels taut.
- Give your loaf a proper cold proof in the fridge (8-12 hours) before baking. This firms up the dough and makes it much easier to control.
- Use a banneton or floured bowl to support the shape during the final proof instead of letting it sit free-form on the counter.
Problem: No Oven Spring at All
Oven spring is that dramatic rise you get in the first 10-15 minutes of baking. When it doesn’t happen, the loaf feels like a letdown even if everything else looked fine going in.
Common causes and fixes:
| Cause | Fix |
|---|---|
| Starter wasn’t strong enough | Retest with the float test, feed it more before your next bake |
| Dough was overproofed before baking | Shorten proof time or move the dough to the fridge sooner |
| Oven wasn’t hot enough when the dough went in | Preheat for a full 45-60 minutes with your baking vessel inside |
| No steam in the first phase of baking | Use a covered Dutch oven, or add a pan of water/ice cubes to the oven |
| Dough wasn’t scored deeply enough | Score at a 45-degree angle, about 1/2 inch deep |
Problem: Gummy or Underbaked Center
Cutting into a loaf and finding a wet, dense band near the bottom is frustrating, especially after all that waiting.
How to fix it:
- Bake longer than you think you need to. Internal temperature should hit 205-210°F. A quick-read thermometer takes the guesswork out completely.
- Let the loaf cool for a full 1-2 hours before slicing. This feels painful, but the crumb is still setting internally even after it comes out of the oven. Cutting too soon traps moisture and makes the bread seem underbaked even when it isn’t.
- If your crust browns too fast before the inside catches up, drop the oven temp by 25 degrees for the second half of baking, or tent it loosely with foil.
Problem: Big Holes or Tunneling Near the Top Crust
That one giant air pocket sitting right under the crust, with dense bread below it, is a shaping issue more often than a fermentation one.
How to fix it:
- Degas the dough more thoroughly during shaping so you’re not trapping large air pockets near the surface.
- Fold and shape with intention rather than rushing. Build layers so gas distributes evenly.
- Reduce steam slightly if you’re using a lot of it, since excess steam early on can cause the crust to set before the loaf finishes expanding, forcing gas to pool in one spot.
Problem: Pale or Soft Crust
A pale, floppy crust means your loaf isn’t getting the heat or moisture it needs early in baking.
How to fix it:
- Bump your oven temperature up by 25 degrees for the first 20 minutes, then drop it back down.
- Use steam. A preheated Dutch oven with a lid traps steam naturally. Without one, a pan of hot water on the lower rack works fine.
- Bake a bit longer overall. A deep, mahogany-colored crust usually needs 45-55 minutes total for a standard boule.
Problem: Flavor Is Bland or Overly Sour
Flavor problems come down to fermentation speed, and both directions (too fast or too slow) throw things off.
If your bread tastes bland:
- Slow down fermentation by proofing in a cooler spot or adding a cold retard in the fridge overnight.
- Use a portion of whole wheat or rye flour in your mix. Even 10-15% adds noticeable depth.
If your bread tastes overly sour or vinegary:
- Shorten your bulk fermentation time.
- Feed your starter more frequently so it stays less acidic.
- Skip long cold retards for a batch or two and bake same-day instead.
A Simple Troubleshooting Checklist Before Your Next Attempt
Run through this list before you mix your dough again:
- Starter passed the float test within the last hour
- Kitchen temperature is between 70-78°F for fermentation
- Dough hydration matches what your flour can actually handle
- Bulk fermentation is judged by volume and poke test, not just a timer
- Shaping builds real surface tension
- Oven preheated for at least 45 minutes with baking vessel inside
- Steam is part of the first 15-20 minutes of baking
- Internal temp checked with a thermometer before pulling the loaf
- Loaf cooled at least 1 hour before slicing
When It’s Time to Simplify Your Process
If you’ve tried adjusting one variable at a time and you’re still getting inconsistent results, it might help to strip things back. Stick with the same flour, the same hydration percentage, and the same schedule for three bakes in a row. Consistency makes it much easier to spot exactly where things are going wrong, instead of chasing five variables at once.
Sourdough rewards patience more than precision. When you get a feel for how your dough looks and behaves at each stage, the guesswork fades. Your loaves start coming out the way you pictured them!
FAQ
Why did my sourdough turn out flat even though my starter passed the float test?
A healthy starter is only one part of the equation. If the dough overproofs during bulk fermentation or the final proof, the gluten structure weakens and can’t hold its shape, so the loaf spreads out instead of rising up. Pull back your proof time and watch the dough’s volume instead of relying on a set number of hours.
Can I fix a gummy loaf after it’s already baked and cooled?
Not really, but you can learn from it. A gummy crumb almost always means the loaf needed more time in the oven or more time cooling before slicing. Next bake, check internal temperature with a thermometer (aim for 205-210°F) and let it rest a full hour or two before cutting.
How do I know if the problem is my starter or my technique?
Test your starter on its own first. Feed it and watch how long it takes to double. If it doubles within 4-6 hours and passes the float test, your starter is fine and the issue is likely fermentation timing, shaping, or oven setup. If it’s sluggish or doesn’t pass the float test, start there before troubleshooting anything else.
Why does my bread taste sour even when I shorten the bulk fermentation?
Your starter itself may be running acidic. If it sits too long between feedings, it builds up more acidity, and that carries into the dough no matter how short your bulk ferment is. Feed it more often, even twice a day for a few days, and see if the flavor mellows out.
Is it normal for every loaf to come out a little different?
Yes, and that’s part of baking with a live culture. Room temperature, flour freshness, and even humidity all nudge the results. Small variation from bake to bake is normal. What you’re troubleshooting for is consistent, repeatable problems, not tiny day-to-day differences.
Do I need a Dutch oven to get good oven spring?
No, but it makes steam management a lot easier. If you don’t have one, a baking stone or steel with a pan of hot water (or a handful of ice cubes) on a lower rack gets you most of the way there. The steam matters more than the specific vessel.
How long should I wait before assuming a fix isn’t working?
Give any single change three bakes before judging it. One loaf can be thrown off by something unrelated, like a hot kitchen or a slightly older bag of flour. Three consistent results in a row tell you whether the fix actually worked.
![[video] from the seed to the peasant bakery with nicolas supiot](https://www.mydailysourdoughbread.com/wp-content/uploads/2022/11/image-16-120x120.jpeg "[Video – Part 2] Entering Into Peasant Bakery 6")
