ZAPI AC2 ON HYUNDAI 25B-7 ELECTRIC TRUCK - THIS UNIT STARTED DISPLAYING ERRATIC, RANDOM ERROR CODES- WE HAD ANOTHER UNIT WITH NO ERRORS SO WE HAVE TRIED CHANGING COMPONENTS ( NEW CONTACTORS INSTALLED, AND ALL OTHER ITEMS SWAPPED FROM WORKING UNIT: ZAPI DISPLAY, MAIN INVERTER, BATTERY) TO SINGLE OUT THE SOURCE BUT NO AVAIL. USING THE LX HANDSET WE CAN RESET ALL PARAMETERS AND EVENTUALLY THE UNIT WILL WORK, BUT IN A FEW HOURS OR DAYS ERRORS RETURN, LATEST BEING P 30 VMN LOW.

ANY HELP GREATLY APPRECIATED