Check all wiring between the display and the corresponding control board.
- Pay close attention to the wire crimping on plug J13 for each display and motor control boards. And J5/DISPLAY C of temperature control module.
- Swap the J13 plugs from one display to the other
- If E99 remains on the same display, replace the Display
- If E99 moves to other display then reverse the J13 on motor control with J5/DISPLAY C of temperature control module to determine if cable or lower control is the cause.