When a residential clothes dryer takes two full hours or longer to dry a standard load of laundry, the malfunction is almost always caused by a severely restricted or clogged exterior exhaust vent duct, a blocked lint screen, or a malfunctioning heating component. When lint buildup prevents hot, humid air from venting outside your home, moisture remains trapped inside the closed drum, forcing the machine to run indefinitely. You can troubleshoot airflow restrictions easily by checking the outdoor vent hood. You can verify that your corrective action is successful when cleaning accumulated lint out of the exhaust duct and washing the metal lint screen restores rapid airflow and reduces cycle times back to normal.
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