Whirlpool error code F30: The dryer's control board detected restricted airflow based on thermistor temperature readings that indicate exhaust heat is not dissipating at the expected rate.
The dryer's control board detected restricted airflow based on thermistor temperature readings that indicate exhaust heat is not dissipating at the expected rate.
Remove the lint screen and wash it with warm soapy water. Rinse until water flows freely through the mesh. A film-coated screen (from dryer sheets) blocks airflow even when it looks clean. Let it dry before reinstalling.
Pull the dryer away from the wall and inspect the flexible transition duct. It should be fully extended with no kinks, sharp bends, or crushing. A kinked duct is one of the most common causes of airflow errors.
Go outside and locate the dryer exhaust cap. Remove it and check for lint buildup inside the housing and on the damper flap. Bird nests are a common seasonal blockage. Clean thoroughly and confirm the flap opens freely.
Tools needed: Flashlight, Gloves
Use a dryer vent cleaning brush kit (available at hardware stores for $20–$30) to clean the entire duct length from inside. Feed the brush through the duct from the dryer end while rotating. Pull out all accumulated lint.
Tools needed: Dryer vent cleaning brush kit
The total duct length (including elbow equivalents) should not exceed the manufacturer's maximum — typically 25–35 feet. Each 90° elbow counts as 5 feet. If your run is too long, the dryer will always restrict, regardless of cleaning.
Tools needed: Measuring tape
Flexible vinyl or foil duct collapses, kinks, and accumulates lint in its ridges. Replace it with smooth-wall rigid aluminum or galvanized duct wherever possible. This alone often eliminates chronic airflow errors.
Tools needed: Rigid metal duct sections, Metal duct tape, Screwdriver set