Accu-Chek Performa Error codes E-9 The battery is almost out of power. Change the battery now. If the message reappears after the battery been replaced, remove the battery again, press any meter button, then reinsert the battery. E-10 E-10 The time and date settings may be incorrect. E-8 E-8 The temperature is above or below the proper range for the… E-7 E-7 An electronic error occurred. E-3 E-3 A meter or test strip error has occured. E-1 E-1 The test strip may be damaged, not properly inserted, or… E-10 The time and date setting may be incorrect. E-6 Blood or control solution was applied to the test strip before… E-4 Not enough blood or control solution was drawn into the test… View all error messages