If you are experiencing scorch marks and a backflow of old lint in your dryer, despite regularly cleaning the lint filter, there may be a few possible causes:
Lint buildup in the dryer vent: While you clean the lint filter after each use, lint can still accumulate in the dryer vent over time. If the vent becomes clogged or restricted, it can lead to poor airflow and increased heat inside the dryer. This excessive heat can scorch the clothes and cause lint to be forced back into the dryer drum. It's essential to periodically clean the dryer vent to prevent lint buildup.
Clogged or restricted exhaust vent: The exhaust vent that leads from the dryer to the outside of your home may be clogged or obstructed. This can cause hot air, moisture, and lint to back up into the dryer drum, resulting in scorch marks and lint accumulation. Inspect the exhaust vent and ensure it is clear of any blockages.
Malfunctioning thermostat or heating element: If the dryer's thermostat or heating element is faulty, it may result in excessive heat, leading to scorch marks on clothes. A malfunctioning thermostat may not regulate the temperature properly, while a defective heating element can produce hot spots. In either case, professional repair or replacement may be necessary.
Overloading the dryer: Overloading the dryer with too many clothes can impede proper airflow. Insufficient airflow can cause overheating and result in scorch marks on clothes. Ensure that you are not overloading the dryer and allow enough space for clothes to tumble freely.
Worn drum seals or gaskets: Damaged or worn drum seals or gaskets can allow hot air, lint, and moisture to escape into areas of the dryer where they shouldn't be. This can lead to scorch marks and lint backflow. Inspect the drum seals and gaskets for any signs of wear or damage and replace them if necessary.
If you continue to experience these issues even after taking the necessary precautions, it is recommended to consult a professional appliance technician who can diagnose and address the specific problem with your dryer. They will be able to provide a more accurate assessment and perform any necessary repairs to ensure the safe and efficient operation of your dryer.