Accu-Chek Performa Owner's Booklet page 63

The temperature is above or below
the proper range for the system.
Refer to the test strip package insert
for system operating conditions.
Move to an area with the appropriate
conditions, wait 5 minutes, and
repeat the blood glucose or control
test. Do not artificially heat or cool
the meter.
The battery is almost out of power.
Change the battery now.
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The time and date settings may
be incorrect. Make sure the time
and date are correct and adjust, if
necessary.
4/24/12 8:32 AM
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