Accu-Chek Performa Nano Owner's Booklet page 60

Troubleshooting Checks
5. Check if the test strips and control
solutions were stored in a cool, dry
place.
6. Check if you followed the testing steps.
7. Check if you chose the correct control
58
solution level, either 1 or 2, when you
performed the test.
8. Check if the code number on the meter
display matches the code number on
the test strip container.
9. If you are still unsure of the problem...
Action
Repeat the control test with a properly
stored test strip or control solution.
Read Chapter 4, "Control Testing" and
test again. If you still have problems,
call Roche.
If you chose the wrong control solution
level, you can still compare the control
result to the range printed on the test strip
container.
If they do not match, insert the correct
code chip into the meter and test again.
Repeat the control test with a new test
strip. If you still have problems, call Roche.