If the drum turns but clothes stay damp, answer two questions: is there heat, and is there strong airflow? That split separates many vent problems from heating failures.
Start with the load and lint filter
An overloaded drum dries slowly because air cannot move between garments. Clean the lint screen and retry with a smaller load.
Check airflow at the exterior vent
While keeping clear of hot and moving parts, confirm that the exterior flap opens and air exits strongly. A crushed, overly long, or lint-loaded duct increases drying time and fire risk.
If there is no heat, stop repeating cycles
An electric dryer can sometimes tumble even when part of its heating supply is missing. A gas dryer may have an ignition or fuel issue. Do not bypass safety devices or open gas components.
Very hot but still damp often points back to airflow
Hot clothing, unusually long cycles, and an excessively hot cabinet are consistent with heat being trapped. Stop the dryer and address venting before continued use.
When service is the next step
If the load, filter, and complete vent path are good but heat is absent or cycles remain abnormal, internal diagnosis may involve heaters, sensors, thermal fuses, or gas components.
Sources
- U.S. Consumer Product Safety Commission — Clothes Dryer Safety — Dryer fire prevention, lint removal, exhaust venting, and safe operation.