The short answer
Dryer noise is unusually diagnostic: the character of the sound names the part more reliably than any test does. A squeal is a bearing, a thump is support, and a rattle or scrape is usually something loose that does not belong there. Turn the drum by hand with the power off. A noise you can reproduce by hand is mechanical and in the drivetrain; a noise only present under power is the blower or the motor. On a Summit dryer the cause that ranks first is something loose inside the blower wheel.
What you observe
- The whole machine walking or drumming on the floor — Stance, not a failed part.
- A rhythmic thump, once per drum revolution — Support wear — rollers at the back or glides at the front.
- NEAR MISS — a whistle from the vent rather than the cabinet — That is airflow, and it belongs with the vent and heating checks.
Causes, most likely first on a Summit dryer
- Something loose inside the blower wheel — Coins, buttons and pen caps find their way past the lint filter into the blower housing and rattle furiously against the wheel. It ranks first on a Summit dryer because there is very little slack behind the panels of a compact cabinet, so anything that restricts restricts completely.
- Idler pulley bearing dry — The tensioner that keeps the belt tight spins on a small bearing, and when it dries out it squeals — loudest on start-up and when the drum is loaded. Second on this platform: it is a small, unlubricated bearing doing continuous work, so it is the part that squeals first.
- Drum support rollers or front glides worn — The drum rides on rollers at the back and slides on felt or plastic glides at the front, and both wear flat, giving a rhythmic thump once per revolution. Ranked here because they carry the full weight of the drum and the load on every single revolution.
- Machine not level, or standing on a flexible floor — An unlevel machine drums against the floor and walks, and the sound is the floor as much as the appliance. Last, and the reason to work down the list rather than guess: the stance changes whenever the machine is moved, and it is the cheapest of all the causes to correct.
Check in this order, and why
- Listen for whether the noise stops the moment the drum stops turning — A rattle that dies instantly with the airflow is in the blower.
- Start the machine empty and listen for a squeal that fades as it warms — A squeal that eases after a few minutes is a dry bearing, not a belt.
- Turn the drum slowly by hand and listen for a once-per-turn thump — A noise that repeats with drum position is support wear, not the blower.
What an owner can safely check
- Check the lint filter housing and the pockets of the last load for what is missing — Anything small and hard that went in with the wash is a candidate.
Tools: torchAbout 10 min
- Spin the empty drum by hand and note whether the thump repeats at the same point — A flat spot you can feel through the drum is the answer.
About 10 min
- Level the machine on its feet until no corner rocks under hand pressure — On a suspended floor, a sheet of ply under both feet helps more than the feet do.
Tools: spirit level, spannerAbout 20 min
- STOP HERE — the next check means a meter, a panel, or both — The ranking above tells you what to ask for; it does not make the remaining tests owner work.
Before you open anything
Safety
Unplug the dryer or switch off its breaker before removing any panel, and if it is a gas machine, shut the gas valve at the appliance before moving it.
When to call a technician
Call once the stance and the blower are ruled out and the noise is still there under power, and stop using the machine immediately if you smell hot metal. On a compact machine, expect access to be the larger half of any labour quote — the part itself is rarely the expensive part.
Nearest pages of this class
What this page does not cover
This is the generalized page for a Summit dryer. It does not carry anything model-specific: no part numbers, no wiring colours, no panel sequence and no torque figures, because those differ between families sold under the same badge. Where a family- or model-level page exists it is linked above, and it is the more specific answer of the two.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
