Can you click any of the buttons on the LCD and get a response? As Nathan suggested, you should be able to clear the past messages by clicking the check mark button a few times. If not, I'd try logging into the unit and check the recently modified /var/log/ log files, particularly /var/log/ltm, for errors.
You can find related AskF5.com solutions by search for "LED". Here's one relevant SOL I think Nathan quoted from:
SOL4263: New front panel LED indicator behavior in BIG-IP version 9.x
https://support.f5.com/kb/en-us/solutions/public/4000/200/sol4263.html?sr=9008393
Aaron
Altostratus
