Accu-Chek Nano Owner's Booklet page 86

The test strip may be damaged.
Remove the test strip and reinsert it,
or replace it if damaged.
84
Your blood glucose may be extremely
high or a meter or a test strip error
has occurred. If your test result
matches how you feel, contact your
healthcare professional immediately.
If your test result does not match
how you feel, repeat the test and
refer to Chapter 3, Unusual Test Results. If this test
result does not match how you feel, perform a
control test with the control solution and a new test
strip. If the control result is within the acceptable
range, review the proper testing procedure and
repeat your blood glucose test with a new test strip.
If the E‑3 code still appears for your blood glucose
test, your blood glucose result may be extremely
high and above the system's reading range. Contact
your healthcare professional immediately. If the
control result is not within the acceptable range, see
Chapter 2, Understanding Out‑of‑Range Control Test
Results.