Accu-Chek Compact Plus Owner's Booklet page 74

Display Messages and Troubleshooting (continued)
If there was a partly used test
drum in the meter and it took
longer than two minutes to
replace the batteries, the year,
date, and time have to be re-set.
When the year, date, and time
are re-set, the meter does not
know how long the partly used
test drum has been in the meter.
You should run a control test to
verify that the test drum is
useable. See Chapter 2, Why Run
Control Tests?
Chapter 5: Maintenance and Troubleshooting 72
ACCU-CHEK Customer Care Service Center 1-800-858-8072
The test drum 90-day use-by
period has expired. If the correct
time and date were set on the
meter and the drum door has not
been opened since the
installation of the test drum,
discard the old test drum and
insert a new test drum.
The drum door was opened and
closed with a partly used test
drum inside, or a partly used test
drum was inserted.