When a residential clothes dryer takes excessive time to dry a normal batch of laundry, stretching cycles to ninety minutes or more, the malfunction is almost always caused by restricted or blocked exhaust ventilation. When lint accumulation inside the flexible duct or outdoor vent hood prevents hot, humid air from escaping your home, moisture remains trapped inside the closed drum, forcing the machine to run indefinitely. You can troubleshoot airflow restrictions easily by inspecting the outdoor vent flapper. You can verify that your corrective action is successful when disconnecting the duct, cleaning out accumulated lint clumps with a brush, and washing the lint screen restores rapid airflow and reduces cycle times back down to the normal forty-five-minute range.
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