Diagnostic code WO7WFD on ThinkCentre 300

I just ran the diagnostics available from Lenovo. Got back diagnostic code WHD0001V00001-WO7WFD (targeted read test and short self test). Just before this I installed a fresh copy of Win 10 Pro from CD but did not re-partition hard drive. Just reformatted. Only apps installed were Firefox, Adobe Reader, and Adobe Flash. I can't find a list of codes and meanings. What's the problem???