Blood Glucose Measurement
Symptom
The device does not
display a message
after inserting a test
strip.
The test does not start
after applying the
sample.
The control solution
testing result is out of
range.
Blood Pressure Measurement
Symptom
Nothing is displayed
after pressing the
Power button.
The heart rate is
higher/lower than
user's average.
The result is higher/
lower than user's
average measurement.
Cause
Test strip inserted upside
down or incompletely.
Defective device or test strips.
Insufficient blood sample.
Defective test strip.
Sample applied after the
device is automatically turned
off.
Defective device.
Error in performing the test.
Control solution vial was
poorly shaken.
Expired or contaminated
control solution.
Control solution that is too
warm or too cold.
Defective test strip.
Device malfunction.
Cause
Batteries incorrectly installed
or no battery is installed.
Movement during
measurement
Measurement taken just after
exercise.
May not be in correct position
while measuring.
Blood pressure naturally varies
from time to time.
Defective test strip.
Device malfunction.
EN-24
D40 Owner's Manual
What To Do
Insert the test strip with contact
bars end first and facing up.
Please contact customer service.
Repeat the test using a new test
strip with larger volume of blood
sample.
Repeat the test with a new test strip.
Repeat the test with a new test
strip. Apply sample only when
flashing " " appears on the
display.
Please contact customer service.
Read instructions thoroughly
and repeat the test again.
Shake the control solution
vigorously and repeat the test
again.
Check the expiration date of the
control solution.
Control solution, device, and
test strips should be at room
temperature (20°C to 25°C / 68°F
to 77°F) before testing.
Repeat the test with a new test
strip.
Please contact customer service.
What To Do
Check that the batteries are
correctly installed.
Repeat measurement
Rest at least 30 minutes before
repeating measurement
Adjust to the correct position to
measure.
Keep in mind for next
measurement.
Repeat the test with a new test strip.
Please contact customer service.