What's Happening

Exhaust temperature exceeded safe limits. Blocked vent. Fire hazard.

How to Fix It

Clean lint filter and entire vent duct immediately.

Frequently Asked Questions
What does F4E3 mean on a KitchenAid dryer?
F4E3 means the dryer is overheating from blocked airflow. Fire hazard.
Is F4E3 dangerous?
Yes. Clean the entire vent system immediately.
What if it persists after cleaning?
The high-limit thermostat or control board may be faulty.