There are several error messages that are not contained in the sensION+ meter manual. What do these mean?

Document ID

Document ID TE690

Published Date

Published Date 27/05/2017
Question
There are several error messages that are not contained in the sensION+ meter manual. What do these mean?
Summary
sensION+ meter error message is not in the manual
Answer
Below are some other error messages that are not contained in the manual:

"nnn" a- indicates out of range during measurement
"Er U" - appears during calibration procedure, indicates out of range
"Er 1" - unstable measurement after 100 seconds during measurement or calibration