The last fault on your expert is a very helpful information to identify where an issue might be on the device. 

In order to get this last fault, you will need to go into the Advanced Menu of your Expert or Expert Pro:

1. Make a long press on the tone button of your Remote
2. First information that appears in this screen are the main information (serial number/Hardware version/Software version etc...)
3. To move into this menu, you will need to make a short press on the tone button again, until your screen view a "Last fault" menu.