You need to hold in the CONT button on the analyzer as you turn on the key switch. That should put you into analyze mode.
Code 16 is for battery volts being wrong. Check function 15 for the proper battery being used and change setting if necessary. Checked for overcharged battery or wrong battery being used.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.