This prompt indicates that there is a problem with the connection between the hotend circuit board and the motherboard, which may be caused by poor wiring or damage.
Check the wiring: Ensure that the wiring of the hotend circuit board is stable, and re-plug it if necessary to confirm good contact.
Replace the hotend circuit board: If the wiring is normal but the problem persists, you may need to replace the hotend circuit board.
Check the wiring of the hotend circuit board to ensure that they are securely connected.
If the cable is loose, reinsert it to ensure that it is properly connected.
If the problem is not solved, consider replacing the hotend circuit board.