Accu-Chek Performa Nano Owner's Booklet page 72

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 4, "Understanding Out-of-Range
Control Test Results."
70
Not enough blood or
control solution was
drawn into the test
strip for measurement
or was applied after the
test had started.
Discard the test strip
and repeat the test.
The code chip is from an
expired lot of test strips.
Ensure the code chip
number matches the
code number on the test
strip container. Remove
the code chip and enter
the set-up mode to
ensure the time and date in the meter
are correct.