The short answer for this family
On the Alliance FDG family, a dryer making a noise it did not make before is usually something loose in the drum or the blower. Heat on this build is a gas burner that must prove ignition every cycle, so the fault is far more often a failed light-off than a failed heater. The brand-generic article for this symptom ranks worn drum rollers, glides or a rear bearing first; on this platform it does not.
What you observe on these models
- Which of the family's models you are standing in front of — The matrix on this page is one masked production model, so the whole family is one build, and that is worth reading first, because heat on this build is a gas burner that must prove ignition every cycle, so the fault is far more often a failed light-off than a failed heater.
- A rumble that rises with the load — Support parts carrying weight they no longer carry cleanly.
- A rhythmic thump once per drum revolution — Something on the drum or a flat spot on a roller, and both repeat with rotation.
- A rattle that is constant regardless of the drum — That is in the blower rather than the drum.
Causes, most likely first on the FDG family
- Something loose in the drum or the blower — Ranked first because heat on this build is a gas burner that must prove ignition every cycle, so the fault is far more often a failed light-off than a failed heater.
- Worn drum rollers, glides or a rear bearing — Second. A machine that runs back-to-back loads rather than one load an evening, so the support parts wear on a schedule rather than failing at random.
- A broken or slipping drive belt — Third. Turn the drum by hand with the power off: free and weightless means the belt is off.
- A restricted lint path or exhaust duct — Fourth. Still the cheapest thing on this list to rule out, and it rules out several others with it.
- The cycle control, timer or moisture sensor — Last before a service call. Suspect the control once the airflow and the heat path are proven.
- Body: This is not the brand-generic ranking. Something loose in the drum or the blower moves to the top of this family's ranking and worn drum rollers, glides or a rear bearing goes down to second place, because the platform here is a front-load cabinet whose heat is made by a gas burner with an igniter and a flame sensor.
Check in this order on these models
- Empty the drum and turn it slowly by hand — A noise once per revolution with an empty drum is an object or a flat spot, and neither needs a meter to find.
- Load the drum and listen again — A rumble that gets worse with weight is the support rather than anything attached to the drum.
- Feel the drum for drag as you turn it — A belt that has stretched slips and squeals under load while turning normally by hand.
- Check the blower area for anything loose — A coin that has passed the filter housing lives in the blower and rattles constantly rather than rhythmically.
- Body: The order follows the ranking, and the access decides the rest: on these models the burner assembly is behind the lower front panel, with the valve coils and igniter on the same bracket.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel or reaching into the drum area; a capacitor can hold a charge after the power is off. Never run the machine with a panel off to locate a noise: the drive and the blower are exposed and they do not stop for a hand. On a gas build, close the appliance gas valve before working inside the cabinet.
Models in the FDG family
Reference| Model number | Family key |
|---|---|
| FDG4Z***115T*** | alliance:dryer:fdg |
Where the owner limit falls on these models
Call when the drum is empty, the machine is level and the noise is still there, and call promptly if the noise is a grinding or if the drum has become stiff to turn. A support part that has begun to fail takes the drum out of line, and a drum out of line damages what it rubs against.
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.
