Sharp slap or bang only with clothes inside
The noise changes with different loads, especially towels, jeans, shoes, or items with metal hardware.
Start here: Start with Step 1. This is often a load issue or something caught in the drum baffles.
Dryer noise troubleshooting
Dryer Making Thumping Noise
Direct answer: A dryer that makes a thumping noise usually has one of two things going on: something in the load is striking the drum, or the drum support parts are worn and the drum is riding unevenly. A thump that starts loud and softens after a few minutes often points to a flat-spotted dryer drum roller.
Most likely: Start with the load, then check for a repeated once-per-revolution thump, a sagging drum edge, or a rough hand-turn of the drum. Those clues separate a simple clothing issue from worn dryer drum rollers, dryer drum glides, or a dryer idler pulley.
Listen to the rhythm before you take anything apart. A shoe, buckle, or zipper makes a sharper slap. A worn support part makes a deeper, more regular thump that you can often feel through the cabinet. Reality check: a dryer can keep running for a while with a bad roller, but it usually gets louder, not better. Common wrong move: replacing the dryer belt first just because the cabinet is already open.
Don’t start with: Do not start by ordering a motor or control board. Those are not the usual cause of a steady thump.
If the thump happens only with heavy itemsRun the dryer empty for one minute. If the noise disappears, start with the load, not parts.
If the thump is there empty and loadedUnplug the dryer and check for drum wobble, rough spots, or a dropped front drum edge.
Last reviewed: 2026-04-05
What the thumping sounds like
Deep steady thump even when empty
The sound repeats at a regular pace and does not depend much on what is in the dryer.
Start here: Go to Step 2. That pattern fits worn dryer drum support parts more than the load.
Loud at startup, then better after a few minutes
The first few minutes are the worst, then the dryer settles down as it warms up.
Start here: Go to Step 4. Flat-spotted dryer drum rollers are a common match for that pattern.
Thump with a light squeak or scraping at the front
You hear a dull bump plus a rub or chirp near the door opening.
Start here: Go to Step 3. A worn front drum glide or felt support is more likely.
Most likely causes
1. Heavy items or hardware striking the drum
A single shoe, a belt buckle, or wet towels balled up together can make a hard repeating slap that sounds worse than it is.
Quick check: Run the dryer empty. If the thump is gone, re-run with a smaller balanced load.
2. Flat-spotted or worn dryer drum rollers
When a dryer sits or the rollers wear unevenly, the drum rides over a flat spot once each turn and makes a dull thump, often worst when cold.
Quick check: With power disconnected, turn the drum by hand. A lumpy or rough feel points this way.
3. Worn dryer drum glides or front drum support felt
If the front of the drum drops slightly, the drum can bump and rub as it turns, often adding a scrape or chirp near the door.
Quick check: Lift up gently on the front edge of the drum. Excess play or a dropped front edge is a strong clue.
4. Dryer idler pulley wobble or belt tracking problem
A bad idler usually squeals first, but it can also create a rhythmic bump if the belt is riding badly or the pulley is loose.
Quick check: If the thump comes with belt squeal or a fluttering sound from below the drum, inspect the belt path.
Step-by-step fix
Step 1: Rule out a load problem first
A lot of dryer thumps are just the load hitting the drum or cabinet, and this is the fastest safe check.
- Pause the dryer and remove bulky items, shoes, or anything with metal hardware.
- Run the dryer empty for about one minute and listen.
- If the dryer is quiet empty, dry a smaller load with similar items spread out instead of packed together.
- Check the drum baffles for a loose item trapped inside or a screw backing out into the drum.
Next move: If the thump is gone empty and stays mild with a smaller balanced load, the dryer itself is probably fine. If the dryer still thumps empty, move on to the drum support checks.
What to conclude: A noise that disappears empty is usually not a failed internal part.
Stop if:
- You hear metal-on-metal grinding instead of a soft thump.
- You smell burning lint or hot rubber.
- A drum baffle is loose or cutting clothing.
Step 2: Listen for the rhythm and feel the drum by hand
The sound pattern tells you whether the drum is riding over a bad support point or something is scraping at the front.
- Unplug the dryer. If it is gas, shut off the gas supply before opening anything.
- Open the door and rotate the drum by hand several turns.
- Feel for one heavy spot, a bump once per turn, or rough drag.
- Watch the front drum edge as you turn it. Look for wobble, a dropped edge, or uneven gap around the opening.
Next move: If the drum turns smoothly with no wobble, the problem may be load-related or lower in the belt path. If you feel a repeated bump or see the drum ride unevenly, the support parts need closer inspection.
What to conclude: A once-per-turn bump usually points to a roller issue or a drum support problem, not electronics.
Step 3: Check the front drum support area for sag and rub marks
A worn front support lets the drum drop, which creates a thump plus scrape near the door opening.
- With the dryer unplugged, lift gently on the front lip of the drum.
- Look for excessive up-and-down play at the front edge.
- Inspect the front support area for worn glide material, missing pads, or dark rub marks.
- Check for torn or displaced front felt that could let the drum ride low.
Next move: If the front edge is stable and the support surface looks intact, the front support is less likely the main problem. If the drum front lifts easily, scrapes, or shows worn support material, plan on replacing the front drum support parts.
Step 4: Inspect the dryer drum rollers and belt path
This is the most common internal cause of a steady dull thump, especially one that improves as the dryer warms up.
- Open the cabinet enough to access the drum support area according to your dryer design.
- Inspect the dryer drum rollers for flat spots, wobble, cracking, or stiff rotation.
- Spin each roller by hand. It should turn smoothly without binding or rumbling.
- Check the dryer idler pulley for wobble, roughness, or a belt that is riding off-center.
- Look at the dryer belt for frayed edges or polished spots that suggest poor tracking.
Next move: If the rollers spin smoothly and the belt path is straight, the thump may be coming from the drum seam, baffle hardware, or a less common internal strike point. If a roller is flat-spotted, rough, or loose, replace the worn dryer drum rollers. If the idler is rough or wobbling, replace the dryer idler pulley at the same time.
Step 5: Replace the confirmed worn support part, then test the dryer empty
Once you have a clear worn part, the best next move is a focused repair and a clean test before loading clothes again.
- Replace only the part that matches what you found: dryer drum rollers, dryer drum glides, or dryer idler pulley.
- If one roller is bad, inspect the others closely and replace the worn set if they show the same age and wear.
- Reassemble the dryer, restore power, and run it empty for several minutes.
- Listen for a smooth start, steady rotation, and no cabinet shake.
- Then dry a small normal load and confirm the thump is gone.
A good result: If the dryer runs smoothly empty and with a small load, the repair is complete.
If not: If the thump remains after confirmed support-part replacement, stop and inspect for a bent drum, loose drum baffle, or cabinet damage. That is a good point for a pro if the source is still not obvious.
What to conclude: A successful empty test confirms you fixed the support problem instead of masking it with a lighter load.
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FAQ
Why does my dryer thump only at the start of the cycle?
That usually points to a flat-spotted dryer drum roller. The roller sits in one position between loads, then rounds out a bit as it warms up and turns.
Can a dryer belt cause a thumping noise?
Not usually by itself. A dryer belt more often squeals, slips, or breaks. A thump tied to the belt path is more often an idler pulley problem or a drum support issue affecting belt tracking.
Is it safe to keep using a dryer that thumps?
A mild load-related thump is usually not a big deal. A steady empty-drum thump is different. Keep using it and you can wear the drum supports further, damage the belt, or start rubbing metal where it should not rub.
How do I tell the difference between a roller problem and a front glide problem?
Roller problems usually give a deeper once-per-turn thump, often worse when cold. Front glide problems more often add scraping, chirping, or a dropped front drum edge near the door opening.
What if my dryer thumps and also smells hot?
Stop using it and inspect right away. A hot smell with thumping can mean lint buildup, belt damage, or a support part failing badly enough to create friction. If the smell is strong or you see scorch marks, do not keep testing it.
Could something be stuck inside the dryer drum and make the same sound?
Yes. Loose drum baffle hardware, an item trapped near a baffle, or something caught between the drum and front support can mimic a bad roller. That is why an empty-drum test and a hand-turn check come first.