Thank you for using the Support Forum. It looks like the fault code you are getting, 91,721.00 is a hadware issue and will require service. Please consider contacting your support centre for further assistance.
Thanks, CherylO-Xerox Community Manager
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The unit stop rebooting and display error 91,721.00:17278, I disconnect the power and ethernet cable wait 10 minutes then reconnect both wires and reboot sequence stop after energy star message, display error 91,721.00:17278, I try rebooting several times with diferent time intervals 30 minutes to 6 hours with same results. There is no imformation available on this error??????