The answer in three sentences
Inside an AEG DC dryer there are only four things that can make a noise, and whether the sound keeps time with the drum names which. The drum rides on rollers or glides, a belt drives it, and a motor turns a blower on the same shaft. Each of those makes a characteristic sound, and none of them makes the others. The table below names two models under this family key. They are near enough alike that the fault presents the same way on each; the divergence is in part numbers rather than in how you find it.
What the sound does
- One thump per drum revolution, perfectly regular — A flat spot on a roller, or a damaged section of belt going over a pulley.
- A squeal at the start that eases as the cabinet warms — Stiff grease thinning with heat, which is a part at the end of its life.
- A rattle with no pattern to it — Pocket contents, or something that has fallen into the blower housing.
- A scrape that worsens with a heavy load — The drum running out of true and touching the bulkhead or the front seal.
- NEAR MISS — a hum with no drum movement at all — A broken belt or a seized motor; the will-not-start page for this family covers it.
What is making it, most likely first on the DC line
- The blower wheel cracked or loose — A cracked wheel rattles under airflow and is loudest once the machine is hot — a temperature pattern nothing else on this list produces. All two models under the DC key are built the same way here, so an ordering that fits one of them fits the rest.
- Loose objects in the blower housing or lint path — Coins and buttons drop through the filter slot and land in the blower, where they rattle on every revolution and stop the instant the blower does.
- The drive belt worn or frayed — A belt slaps or squeals instead of thumping, and it degrades progressively, so a noise that has grown over weeks often lives here.
- The machine unlevel, or the exhaust duct drumming — The cheapest cause and the easiest to overlook: an unsupported duct beats against a wall and sounds exactly like a fault inside the cabinet.
The order to work through on these models
- Note whether the sound only appears once the machine is running hot — The temperature signature is the only thing that isolates it.
- Empty the lint filter housing and look into the slot with a torch — Free, and an object here is seen rather than deduced.
- Judge whether the sound is a slap at a fixed rhythm — Separates a belt from a roller by ear alone.
Models in the DC family
Reference| Model number | Family key |
|---|---|
| DC240 | aeg:dryer:dc |
| DC240-1 | aeg:dryer:dc |
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Let the machine cool before reaching inside; drum and duct surfaces stay hot. Leave the door switch wired exactly as it is: it cuts the heater and the motor when the door opens, and that is what keeps a running drum away from your hands. Never run a dryer with its exhaust disconnected indoors, and if the machine is a gas model and you smell gas, do not operate any switch — leave the building and call the gas utility from outside.
The line between an owner check and a service call
Once the lint path, the levelling and the duct are ruled out, rollers, belts and blower wheels all need the cabinet opened and the drum supported. Call sooner if there is a burning smell with the noise, if the drum will not turn freely by hand, or if the machine is stopping partway through — a seizing bearing and a restricted exhaust both put heat where it does not belong.
The rest of this family, fault by fault
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
