The short answer
New noise from a T dryer is usually something loose in the drum or in the blower before it is a worn bearing. The table below carries two model codes for this family, close enough in build that the layout described here holds across both.
What you observe on these models
- A hard rattle or clank that comes round with the drum — Something foreign — a coin, a button, an underwire — either in the drum, caught in the lint path, or in the blower housing.
- A low rumble that rises with drum speed — Drum support rollers or glides wearing. It gets louder over months rather than appearing overnight.
- A squeal or chirp that goes away for a while when the load is changed — A belt or an idler pulley. Load changes shift the tension enough to quiet it temporarily, which is the giveaway.
- A scraping that only happens with a full load — The drum is dropping onto something under weight — glides or rollers worn past their limit.
- A roar or buzzing that continues after the drum stops turning — That is the blower or the motor rather than the drum, and it narrows the search to the back of the machine.
- Thumping that only happens with wet heavy items — Load imbalance. A single wet towel or a pair of trainers will do it on any dryer, and nothing is wrong with the machine.
Causes, most likely first on the T family
- A foreign object in the drum, the lint path or the blower — First. Empty the drum completely, check the lint trap housing with a light, and listen to whether the noise survives an empty drum.
- The machine is not level or is touching something — Worth checking before any panel is removed — it costs nothing and it is common in tight laundry closets.
- The belt or the idler pulley is worn — Third, and it is the cause that can strand you: a belt that finally breaks leaves the motor running and the drum still.
- Drum rollers or glides are worn — The tell is that the noise scales with drum speed and gets worse with a heavy load.
- The rear drum bearing or the motor bearing has failed — Last, by elimination. It is uncommon on a young machine and unmistakable on an old one.
Check in this order, and why
- Empty the drum and run it for a minute — An empty drum removes the load as a variable. A noise that vanishes was the laundry; a noise that stays is the machine.
- Rock the machine at each corner — Adjust the feet until it does not move, and make sure nothing is touching the cabinet sides.
- Check the lint trap housing with a torch — Coins, clips and buttons collect below the trap and rattle at every revolution.
- Turn the drum by hand with the power off — Unplug first. Feel for roughness, a catch once per revolution, or a drum that drops as you push it.
- Listen while the drum coasts to a stop — Noise that continues after the drum stops belongs to the blower or the motor.
Models in the T family — Each code here is pinned to a single build, so match the tag inside your door frame character for character.
Reference| Model number | Family key |
|---|---|
| T21 | bosch:dryer:t |
| T27 | bosch:dryer:t |
Before you open anything
Safety
Switch the breaker off before opening anything, and close the gas valve first on a gas model; a capacitor can hold a charge after the power is off. A dryer is heavy and awkward — move it with two people, and never run it with a panel off to locate a noise, because the blower and the belt are exposed while it does.
When to call a technician
Emptying the drum, clearing the lint housing, levelling the machine and identifying whether the noise survives an empty drum are all owner checks on these models. The line is the panel: rollers, glides, the belt, the idler and the blower wheel all need the cabinet opened with the machine moved out, isolated and, on a gas model, with the gas closed off.
Sources — The symptom-report corpus recorded in this snapshot is what put this symptom on the page for this brand and appliance.
Documented- amazon-reviews — amazon-reviews, fetched 2026-09-02
Other symptoms covered for this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
