Accu-Chek Performa Nano Error codes E-1 The test strip may be damaged or not properly inserted. Remove and reinsert the test strip, or replace it if damaged. E-10 The time and date settings may be incorrect. E-9 The batteries are almost out of power. E-8 The temperature is above or below the proper range for the… E-7 An electronic error occurred. E-6 Blood/control solution was applied to the test strip before… E-5 This message may appear when using a white code chip in the… E-4 Not enough blood / control solution was drawn into the test… E-3 The user's blood glucose may be extremely high or a meter… E-2 The activation chip is incorrect. View all error messages Product Support Support videos Downloads & Guides