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 The time and date settings may be incorrect. E-8 The temperature is above or below the proper range for the… E-7 An electronic error occurred. E-6 Blood was applied to the test strip before the flashing drop… E-4 Not enough blood was drawn into the test strip or was applied… E-3 A meter or test strip error has occured. E-1 The test strip may be damaged, not properly inserted, or was… View all error messages Product Support Support videos Downloads & Guides