WFW8300SW03 Tried clearing error twice (power removed for a few minutes) but still blinks. Need to order control board I think.

Yes you would need to replace the board to fix that problem. The board you need is linked below:

https://prismparts.com/products/washer-electronic-control-acu-ccu-part-number-rp8162206paz48?_pos=2&_sid=50a46326a&_ss=r