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Brother error code Size Error DX

Quick answer

The loaded paper size is not compatible with 2-sided (duplex) printing. Load a supported size (e.g. Letter, Legal, Mexico Legal, India Legal, Folio).

Before you try the solution

  1. 1. Copy the complete message exactly as shown, including any letters, spaces, or punctuation around Size Error DX.
  2. 2. Find the printer's exact model number. The same-looking code can mean something different on another model family.
  3. 3. Let the current print, scan, or update operation stop before touching controls, paper paths, or covers.

Manufacturer-documented solution

The loaded paper size is not compatible with 2-sided (duplex) printing. Load a supported size (e.g. Letter, Legal, Mexico Legal, India Legal, Folio).

Model scope: Brother's Error and Maintenance Messages for your exact model

If the error is still there

  1. 1Return to the screen or job that produced the message and check whether the code has cleared.
  2. 2If Size Error DX returns, do not repeat a risky procedure. Record when it appears and check the documentation for the exact model.
  3. 3If the documented action does not clear Size Error DX, contact Brother support or a qualified printer technician with the model number and complete message.

Other Brother error codes

All Brother error codes

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Manufacturer reference

The meaning and documented action above were taken from the manufacturer source below.

Error and Maintenance Messages (HL-L2325DW, HL-L2350DW, HL-L2370DW, HL-L2370DWXL)

Verified against manufacturer documentation, last checked 2026-08-13. PrintDiag has no printers and no technician, so nothing here is claimed as tested on hardware.