Hi Craig,
Not all of our products have their fault codes available to search, but if yours does they will be on the Xerox.com Support and Drivers page. Just below the search box you will see something like "To find a specific fault code, try our Fault Code Search."
Note: the link above will only take you to the support page not the actual fault code search since it varies by product.
I hope this helps and will help you to get the machines back up and running quickly to allow you to get "Ready for Real Business!"
KenB-Xerox
Why doesn't Xerox post the different fault codes? Sometimes it's something stupid that the operator can fix and save the tech from comming out and my downtime!