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

Yes the board will need to be replaced. The board you need is linked below:

https://prismparts.com/products/washer-electronic-control-acu-ccu-part-number-rp8162206paz48?_pos=4&_sid=87f026584&_ss=r