Even if the print engine is completely toast, it should not affect CWIS. But since it does your only hope is to have a tech altboot it.
Then you will need to break down printing in steps.
Take a print ready file (jpg is easiest) and submit it via CWIS to eliminate the drivers and application, if that doesn't print there is a problem with the printer itself, it it shows no error (I have never seen this occur) a tech would be needed to possibly reset the device and diagnose a hardware failure in the print engine.
Do that via:
And assuming that works, next step is a Windows/Mac test page, if a test page fails, but the above does not, the issue is the driver. Possibly yours has no PS interpreter and needs a PCL driver only, so download the latest Global Print Driver PCL and use that if Windows. You are in a bad way if that is the case and are printing from a MAC since there is no Apple PCL driver from Xerox.
go to Job Status > Completed Jobs and select the failed job to see why it is failing, most likely an Accounting issue