It could have resulted from the following reasons:
1: Low battery, please replace the battery and try again.
2: Incorrect procedure, please insert the test strip firstly, then apply your blood sample.
3: Incorrect absorb operation, please put your finger on the top suction port of the test strip and make sure the top changes to red color after applying the blood sample.
4: Error code, please check the product manual for detailed reasons or contact us directly for further help.