The ambient temperature or the meter temperature is too low or too high for a test. 
Tests cannot be performed at temperatures below +5 °C and above +45 °C as these are the limits of the permitted range. Ensure that the ambient temperature is between +8 and +42 °C and wait for the meter to adjust to that temperature.

A meter error has occurred. 
Repeat the blood glucose test or control test with a new test strip. If the error message appears again, the meter is defective. Contact customer support.

The meter is exposed to too much light. 
Go to a shaded place or shade the meter, for example with your body.
If the meter is exposed to too much light, the meter does not allow any tests to be performed. Do not perform a test when the meter and the test strips are exposed to direct sunlight. 

The meter was exposed to a strong electromagnetic field. 
Change your position or turn the source of electromagnetic radiation off.

While the test was in progress, you connected the meter to a computer that was on. 
Remove the USB cable and repeat the blood glucose test or control test with a new test strip.

Your blood glucose value may be very low. 
If you have typical symptoms of very low blood glucose, follow your healthcare professional’s instructions immediately. Repeat the blood glucose test with a new test strip. 

You removed the test strip from the meter in order to apply blood and did not reinsert it within 20 seconds. 

The test strip was bent or moved while the test was in progress. 

You applied too little blood or control solution to the test strip. 

You waited too long before applying a second drop of blood or control solution. 
Repeat the blood glucose test or control test with a new test strip.

You did not insert the test strip into the meter correctly or completely. 
Hold the test strip so that the arrows printed on it and the test area face upwards. Without bending it, insert the test strip into the test strip guide in the direction of the arrows. You must feel the test strip lock into place.

You inserted a used test strip into the meter.

You applied blood or control solution to the test strip too soon, i.e. before the drop symbol flashed on the display. 
Repeat the blood glucose test or control test with a new test strip.

The measurement window is dirty. 
Clean the measurement window.

When the battery symbol appears on the display for the first time, the battery is almost empty. You can perform approximately 50 more tests with the battery. Change the battery as soon as possible.

The battery is empty or there is no battery in the meter. 
Insert a new battery. You will need one CR2032 type battery.

You have inserted the battery the wrong way round. 
Remove the battery and place it in the battery compartment as shown in the manual.

The temperature may be too low. 
Ensure that the ambient temperature is +8 to +42 °C (+46.4 °F to +107.6 °F).

The meter may be defective. 
Contact Accu-Chek Customer Care.

The test result is lower than 0.6 mmol/L (10 mg/dL). 
Your meter measures blood glucose within a defined range (0.6–33.3 mmol/L or 10-600 mg/dL).
The display may indicate that your blood glucose is lower than the measuring range of the system (0.6 mmol/L or 10 mg/dL).
Follow the relevant instructions given by your healthcare professional for possible hypoglycemia and immediately repeat the test.
If this does not match how you feel, contact Accu-Chek Customer Care.