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In rare cases, an E-3 error code may indicate that your blood glucose is extremely high and above the system's reading range. If you do not feel like your Their website says, ""E-3" in the display means your blood glucose may be extremely high or a meter or a test strip error has occurred." I'm "E-3" in the display means your blood glucose may be extremely high or a meter or a test strip error has occurred. The following instructions should help accu-chek-aviva-performa-e3-error-screen.jpg. accu-chek-aviva-performa-e4-drop-error-screen. accu-chek-aviva-performa-e6-strip-and-drop-.Assuming that it's an “Accu-Chek” meter, it means “Error 3”. That occurs when either your blood sugar is to high for the meter to accurately measure, Point of Care Testing (POCT) - ACCU-CHEK® Performa Quick Reference Guide. Maintained by: E – 3. Test error. Discard the test strip and repeat the test.