Jul 02, 2026
A Clogged Vent Line Is the #1 Cause
When the vent line fills with lint, the dryer cannot push moist air out. The load stays damp, the dryer keeps running, and heat builds up. A professional cleaning of the full line usually restores normal dry times immediately.
Crushed or Kinked Flexible Duct
Flexible foil ducts can get crushed behind the dryer or kinked when the dryer is pushed back into place. A crushed duct is the same as a clog. Straighten it, or better, replace long flex runs with smooth rigid metal.
A Blocked or Stuck Outside Flap
The exterior vent flap must open when the dryer runs. Lint, nests or a stuck hinge can hold it closed, trapping all the moisture inside. Clear the hood and make sure the flap swings freely.
Lint Screen and Drum Issues
A clogged lint screen slows airflow dramatically. Also check that the dryer is not overfilled — overloading leaves too little room for air to circulate through the tumbling load.
Heating Element or Sensor Problems
If airflow is fine but the dryer still runs long, the heating element, thermostats or moisture sensors may be failing. These are repair jobs — if the vent is clear and dry times are still long, it is worth having a technician diagnose the dryer itself.
When to Call a Professional
If you have already cleared the lint screen, checked the flap and confirmed the duct is not crushed, and dry times are still climbing, call a professional. A video inspection can show exactly where the blockage or damage is.
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