RE: 10S Cell Pro charger
I had this same problem exactly. Mine was caused by a bad solder joint (actually looked like no solder) where the pins for the fuse are. Pull out your fuse and see if it's melted and burned. Mine was and it was still working but then I started getting the same error.
Chris
Edit.
BTW, mine did the same thing where it started working again, but soon failed again. Did that for a while before I found the problem.