Maytag medb835dw3 "AF" code

Hey,

I have a 4 year old Maytag MEDB835DW3 electric dryer that started showing an "AF" code on the panel.

I’ve taken the blower housing apart, cleaned out lint (hardly any there), replaced the duct to the wall, had the dryer vent professionally inspected and cleaned, cleaned the moisture sensor bars (also rubbed them down with some emery cloth) and haven’t had any luck getting the dryer to show "Good Airflow".

The dryer does heat, and does dry clothes, but it always indicates insufficient airflow.

I’m not sure which symptom to look for, as I’m not sure it’s actually taking longer to dry clothes, just providing the "AF" error. Any insight to help me get this thing working correctly again?

Thanks!
Chris

As an addendum, I also tried briefly running the dryer with nothing in it and the vent disconnected, and after 30 seconds it showed AF again. Totally at a loss.