MX431 / MS431 office laser family code list
Family-scoped printer codes with severity and the shortest useful meaning line for quick triage.
29.xx
Packing material is still present on one or more installed supplies.
29.xx shown on the control panel as a user-attendance or supplies message.
31.40
The toner cartridge is missing or not responding correctly.
31.40 shown on the control panel as a reinstall missing or unresponsive cartridge error.
31.60
The imaging unit is missing or not responding correctly.
31.60 shown on the control panel as a reinstall missing or unresponsive imaging-unit error.
Paper jam in trays
Paper is jammed in the tray feed path.
Paper jam message shown on the control panel, often tied to tray-feed guidance in the user guide.
Paper jam in the duplex unit
Paper is jammed in the duplex path.
Paper jam message shown on the control panel during two-sided printing.
Paper jam in the automatic document feeder
The original document jammed in the ADF path.
ADF-related jam message shown during copy or scan handling.