Battery replacement
Sounds like you need the battery replaced. I helped a friend out a few years ago and I vaguely remember the procedure. I do remember that it was pretty simple though. You have to remove the unit from the panel, pull off the top panel and swap out the little flat lithium watch type battery. I don't remember the battery type, 2032 maybe? Check AFS website and support forums. I think the procedure is listed there. If you can't find what you need contact AFS and they can explain their procedure. Rob and the crew are always very helpful.