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HP error code Er/01

Quick answer

The printer's input tray is empty. HP's fix: load paper into the tray.

Before you try the solution

  1. 1. Copy the complete message exactly as shown, including any letters, spaces, or punctuation around Er/01.
  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 printer's input tray is empty. HP's fix: load paper into the tray.

Model scope: HP's control-panel error table 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 Er/01 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 Er/01, contact HP support or a qualified printer technician with the model number and complete message.

Other HP error codes

All HP error codes

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Manufacturer reference

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

HP LaserJet MFP M139-M142 series User Guide

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.