I have a Trek+ which I have loved. I went to charge the battery today and, after plugging it in, noticed that the fan to the battery charger did not turn on...but the red light at the back of the battery pack DID turn on. This has never happened before - very strange. When I put the pack on the back of my bike and tried to turn it on, the system did not turn on.

I don't know what's going on. Does anybody out there have any ideas?