Since you have "hand" rather than "center handle" I assume you have a standard display rather than enhanced display. Follow the checks for your latest stored event codes. They should be codes 243-248 and/or 333-343. Most of all pertaining to Pot1 and Fwd Rev opto switches. You can try a handle recalibrate but typically another action will be required. Commonly the opto's are dirty and just need cleaned.