Troubleshooting of a defective fan control board can be found here: https://www.dropbox.com/scl/fi/xpcj9792jorr3cyd8i5h4/Fan-Controller-Troubleshooting.docx?dl=0&rlkey=ks1d9037pm1dnd3jzl9jye9sb
The replacement procedure for a new control board can be found here: https://www.dropbox.com/s/r5sgo8l2f7p1mrh/DC%20Drive%20Replacement%20R2.pdf?dl=0
Lead time is 2 weeks from placement of order.