PB Support has never heard of an L01 error code either. Tried it in multiple outlets, with multiple extension cords.
After describing this issue, and my previous overheating issue (360+ on Smoke - P4 Setting), they have went ahead and sent me a new controller board. Hopefully the RTD Probe isn't also an issue, once the new controller board gets delivered and installed. Guess only time will tell.
FYI, If the attached photo doesn't show the L01 very good, I have a video that shows it alot clearer that I can provide.