Accu-Chek Aviva Nano

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Your blood glucose may be extremely low or the test strip may be
damaged or not properly inserted. If you see this error message
after you applied blood to the test strip, see Chapter 2 “Unusual
Test Results.” If you see this error message before you applied
blood to the test strip, remove the test strip and reinsert it or replace
it if damaged. Verify that the code number printed on the test
strip container matches the code number printed on the code chip
currently inserted in the meter. If the message reappears, call the
Accu-Chek Customer Careline on 0800 701 000 (UK) or
1 800 709 600 (ROI).
The code chip is incorrect. Turn off the meter and insert a new code
chip. If this does not fi x the problem, call the Accu-Chek Customer
Careline on 0800 701 000 (UK) or 1 800 709 600 (ROI).