How to Clear Xerox Error Codes: Service Mode 6789 & Latched Faults

Clearing Fault History and Rebooting via Call Closeout

If you have resolved an intermittent hardware issue and need to clear the stored fault counters and reboot the machine cleanly from UI Diagnostics:

1. Locate and touch the Call Closeout button in the upper-right corner of the UI Diagnostic screen.

2. Check the Reset Counters box to clear the machine’s logged fault history.

3. Touch Exit & Reboot. The copier will save any diagnostic changes to NVM, clear its historical fault counters, and restart in standard customer mode.

If you only need to run test copies or inspect standard admin tools on an AltaLink machine when the customer’s administrator password is unavailable, hold the Home button for 7 seconds and enter passcode 2732 instead to open CSE Service Copy Mode. Always tap the CSE button in the upper-left corner to log out when finished.

Accessing CE Diagnostic Mode on Older Xerox WorkCentre and DocuColor Copiers

Older Xerox WorkCentre series (including the WorkCentre 5225, 5230, 7220, 7225, 7425, 7655, and 7755) and DocuColor 240/242/250/252/260 systems use a physical number pad alongside the touchscreen. Holding the Home button will not trigger the service login on these machines.

1. Hold the 0 key: Press and hold the physical 0 button on the numeric keypad for 5 to 10 seconds.

2. Press Start simultaneously: While keeping the 0 key held down, press the green Start button (or Enter on select panels), then release both buttons.

3. Authenticate with 6789: When the CE Passcode or Service Diagnostics Login prompt appears on the screen, type 6789 and touch Confirm or Enter.

4. Navigate to the diagnostic tools:

   • On WorkCentre 7220/7225 and 7655/7755 platforms, the screen loads directly into the tabbed UI Diagnostic interface (Service Info, Diagnostics, Adjustments, Maintenance, and Call Closeout).

   • On WorkCentre 5225/5230 and 7425-style platforms, press the physical Machine Status button after entering 6789, select the Tools tab, and navigate to System Settings > Common Service Settings > Maintenance / Diagnostics.

To exit diagnostic mode on keypad-equipped WorkCentre models that do not display a Call Closeout tab, press and hold the 0 button again and press Start while holding 0.

Clearing Latched Fuser Faults via NVM Read/Write (dC131)

How Do I Clear Xerox Error Codes That Return After Rebooting?

If you are asking how do I clear Xerox error codes such as 010-320, 010-327, or similar 010-xxx fuser faults that reappear immediately on startup, the answer lies in Xerox’s thermal protection logic. Whenever the control or rear thermistor detects an over-temperature condition (010-320) or fails to detect Ready temperature within the specified warm-up window (010-327), the firmware changes a dedicated NVM address from 0 to 1. As long as that NVM flag equals 1, the printer disables the fuser heater relay on every boot to prevent overheating or fire.

Mandatory Hardware Checks Before Resetting a Fuser Code

Resetting an NVM fuser flag without inspecting the fuser unit is dangerous and ineffective; if a thermistor is open or a halogen lamp is blown, the printer will simply trip the code again within seconds.

1. Power down and cool the fuser: Turn off the secondary power switch and the main power switch, unplug the AC cord, and allow at least 30 minutes for the fuser unit to cool before touching it.

2. Check for wrapped paper and seating: Pull out the fuser assembly, verify that no sheet is wrapped around the heat roller, and confirm that the electrical connector plugs firmly into the chassis.

3. Test electrical continuity (for technicians with a multimeter): On models such as the WorkCentre 5225/5230, verify that the safety thermostat points have continuity, the Main and Sub heater lamps measure 100 ohms or lower, and the Center and Rear thermistors measure 3k ohms or higher without an open circuit. If any reading fails, replace the fuser unit before clearing the NVM code.