HP error code Er/81
Quick answer
Incorrect firmware was loaded onto the printer. HP's fix: press Start Copy/Resume to continue, then load the correct firmware.
Before you try the solution
- 1. Copy the complete message exactly as shown, including any letters, spaces, or punctuation around Er/81.
- 2. Find the printer's exact model number. The same-looking code can mean something different on another model family.
- 3. Let the current print, scan, or update operation stop before touching controls, paper paths, or covers.
Manufacturer-documented solution
Incorrect firmware was loaded onto the printer. HP's fix: press Start Copy/Resume to continue, then load the correct firmware.
Model scope: HP's control-panel error table for your exact model
If the error is still there
- 1Return to the screen or job that produced the message and check whether the code has cleared.
- 2If Er/81 returns, do not repeat a risky procedure. Record when it appears and check the documentation for the exact model.
- 3If the documented action does not clear Er/81, contact HP support or a qualified printer technician with the model number and complete message.
Other HP error codes
- Er/01The printer's input tray is empty. HP's fix: load paper into the tray.
- Er/02A door on the printer is open. HP's fix: verify the top cover is fully closed.
- Er/03The printer failed to pick a sheet of paper for a print job. HP's fix: press Start Copy/Resume to retry the pickup.
- Er/04Paper is jammed in the input tray. HP's fix: open the print-cartridge door, remove the print cartridge, then pull the jammed sheet straight out (never at an angle) and reinstall.
- Er/05Paper is jammed in the toner-cartridge area inside the printer. HP's fix: remove the cartridge (keep it out of direct light), extract the jammed sheet, and reinstall.
- Er/06Paper is jammed in the output-bin area. HP's fix: open the cartridge door, then with both hands pull the jammed sheet free without sharp tools.
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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 GuideVerified against manufacturer documentation, last checked 2026-08-13. PrintDiag has no printers and no technician, so nothing here is claimed as tested on hardware.