50.4 | Fuser error

What This Code Means

Where Users Usually See This Code

• Printer display panels or status lights
• Driver and print queue dialogs
• Maintenance and service screens
• During firmware updates or job processing

Why This Code Appears

• A mechanical or consumable condition prevented printing
• Firmware/job processing hit an internal fault state
• Communication between host and printer failed
• A required component reported an out-of-range state

What Typically Happens Next

• Printing pauses or stops
• The printer may request service or a reset
• The error may persist until the underlying condition is cleared

What This Code Is Not

• It is not always a permanent hardware failure
• It is not necessarily caused by the computer or driver

Troubleshooting Checklist

• □ Check whether the code appears on the printer itself or only on the computer
• □ Power-cycle the printer after clearing obvious paper/consumable issues
• □ Clear the print queue and retry a small test print
• □ Confirm the printer firmware and driver are up to date
• □ If the device reports a service error repeatedly, follow official support guidance
• □ Avoid disassembly unless explicitly instructed by the manufacturer

Notes And Edge Cases