Spent all day trying to connect to the wi-fi in vain. Kept coming up with unable to connect and the error codes above. Everything was correct the password and resetting the router & Roku made no difference. Plusnet my ISP found the solution in the end. Somehow my router was set up to not automatically add new devices. I had to do a factory reset of the router then all worked fine. Just posting this in case anyone else is completely puzzled why they cannot connect to WIFI.
