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Lexmark / MX431 / MS431 office laser family

29.xx - Packing material is still present on one or more installed supplies.

Packing material is still present on one or more installed supplies.

This guide is scoped to the MX431 / MS431 office laser family family. Exact menu wording, cartridge naming, and service behavior can still vary by model variant and firmware.

Severity

Low

Most likely cause

Shipping or protective material is still attached to a toner or imaging supply.

Can you keep using it?

Often yes

Consumables involved

Toner cartridge, Imaging unit

Can you keep using it?

Can you keep using it?

Contact customer support if any of these apply

  • !29.xx remains after all visible packing material has been removed and supplies are reseated.
  • !The printer still reports a supply-installation issue with genuine Lexmark parts.
If the printer still starts normally: This is often recoverable with the basic checks below, as long as the printer returns to ready without a deeper service warning.

What to check first

Step-by-step checks

  1. 1

    Consumable check

    Open the supplies area and inspect the toner and imaging components for any remaining packing strips or protective pieces.

    Start with the official recovery step before moving on to parts or deeper servicing.

  2. 2

    Safe first step

    Remove the packing material and reinstall the supply carefully.

  3. 3

    Safe first step

    Retry only after the supplies are fully seated and clear of shipping material.

Background

What this message usually means

Lexmark uses 29.xx as a user-attendance message when packing material is still present on the installed toner or imaging supplies. On an office mono family like MX431 and MS431, this usually appears right after installation or replacement when a shipping strip or protective piece was missed.

Diagnosis

Likely causes

Most common

Shipping or protective material is still attached to a toner or imaging supply.

Common

A newly installed supply was seated before all packing material was removed.

Possible

A recent supplies swap introduced an installation-state problem.

Service

When service or replacement is more likely

  • -This is an installation-state message first, not a defective-cartridge message.

See also

Related codes in this family

31.40

The toner cartridge is missing or not responding correctly.

31.60

The imaging unit is missing or not responding correctly.

Explore more

More Lexmark printer families

MS / MX series

MS310, MS410, MS510, and more.

CS / CX 310 / 410 / 510 series

CS310, CS410, CS510, and more.

Source notes

Lexmark's service manual lists 29.xx under user-attendance messages and identifies it as packing material present on supplies.

Built around official Lexmark user-guide and service-manual material for the MX431 and closely related mono office models. Exact code behavior can vary a little by print-only versus MFP model and installed options, but the main paper-jam and supply messages stay close across the family.

Printer error codes can vary a little by firmware, region, and exact model variant. Use this guide as a family-level starting point and stop if the next step would require disassembly or service-mode changes.

Known family variants: MX431adn, MX431adw, MS431dn, MS431dw, XM1342

Last reviewed: 2026-04-12

Reference: Open reference

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