The 6 most common part(s) or condition(s) which cause the symptom Dryer takes too long are listed below starting with the most likely. Check or test each item and watch any available videos.
If the dryer takes too long to dry check the venting system. A clogged or partially clogged vent from the dryer to the outside will reduce the air flow through the dryer and greatly increase the drying time.
RepairClinic Item # 1180044
If the dryer takes too long to dry the blower wheel might be broken or plugged. The blower wheel in the dryer is attached to the drive motor and draws the air through the dryer drum. Remove the vent from the back of the dryer and see if the air flow is strong. If not, check the blower wheel.
RepairClinic Item # 1206293
Although not common, if the dryer is slow check the lint filter. The lint filter can get clogged with fabric softener and not allow enough air to pass through. Clean the filter of any residue that might prevent proper air flow.
RepairClinic Item # 525385
The moisture sensor sends a signal back to the control board as it senses moisture in the clothing. If the dryer is slow, this sensor may not be working properly and may be inaccurately sending signals back to the main circuit board.
RepairClinic Item # 1180102
All dryers have a high-limit thermostat to help prevent fires and damage to the dryer. If the dryer is slow, it can be caused by a defective high limit thermostat turning off the burner prematurely. This is not common.
RepairClinic Item # 1181075
The thermistor senses the temperature of the air in the dryer and cycles the heat on and off. If the dryer won't stop, the thermistor may be defective. This is not common.