E21 Comeos On In Diagnostic Mode.

During normal operation, on normal mode, drum turns for about 12 minutes, then all led's flash and drum stops, no heat during cycle. Checked vents, all clear, vaccuumed anyway. Checked exhaust, all clear. Was told it was the control board. Replaced it, still doing it. Now I have discovered technician data sheets and how to do diagnostics. It doesn't explain the E21 that I get in the 1 O'clock position. All else seems to go along with what is printed. Also, I noticed that at about 8 or so minutes, with the new control board, the lights onn the digital display start going around making a big circle while the normal mode is running. ??