HP LaserJet Pro M28-M29a Printers - Blinking Lights

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Attention light blinks, the Ready light is on, and 'Front Door Open' displays

HP LaserJet Pro M28-M29a Printers - Blinking Lights

This document is for HP LaserJet Pro MFP M28a and M29a printers.

The following sections describe error conditions with blinking (flashing) lights displayed on the printer control panel, followed by solutions for each error. Find the blinking light pattern that displays on the control panel, and then follow the steps to resolve the issue.

ID Copy button

Start Copy button

Supply light

Power button and light

Attention light

Cancel button

Attention light blinks

The Attention light

blinks when the printer is in an error state.

This condition occurs when the toner cartridge access door is open or not closed completely. To resolve the error, open the toner cartridge access door, and then close it completely.

Attention light blinks, the Ready light is on, and 'Out of Paper' displays

This condition occurs when the input tray is empty. To resolve the error, load paper into the input tray. For more information about loading paper, go to Loading Paper, Envelopes.

Attention light blinks, the Ready light is on, and a paper jam message displays

This condition occurs when paper is jammed inside the printer. One of the following messages might display on the computer screen:

Printer paper jam
Paper Jam in Fuser
Paper Jam in Tray
Paper Jam in Output Tray

Find and clear the printer of any jammed paper, or reset the printer if the printer has no jammed paper. For more information about resolving paper jam issues, go to Paper Jam Error.

Attention light blinks, the Ready light is on, and 'Paper Size Mismatch' displays

This condition occurs when the paper loaded in the input tray is not the correct size for the print job. To resolve the error, load the correct size paper in the input tray, or change the print settings to match the paper type loaded in the tray.

For more information about resolving the Paper Size Mismatch message, go to 'Paper Mismatch' Error (Windows) or 'Paper Mismatch' Error (Mac), depending on your operating system.

Attention light blinks, and 'Print on Both Sides Instructions' displays

This condition occurs when the printer is processing a manual duplexing (two-sided) print job and cannot complete the print job until the input tray is loaded.

To finish the print job, remove the stack of printed pages from the output tray, and then load the stack with the printed side facing down and the top edge of the stack into the printer. Press the Start Copy button

to print the second sides.

Supply and Ready lights are on, and 'Cartridge Very Low' displays

This condition occurs when the toner cartridge is very low and the Very Low Supply setting is set to Continue. You can continue printing until the print quality is no longer acceptable, or you can replace the toner cartridge.

Step 1: Replace the very low toner cartridge

Replace the toner cartridge with a new toner cartridge.

For more information about replacing the toner cartridge, go to Replacing the Toner Cartridge.

Try to print. If the issue persists, continue to the next step.

Attention light blinks, the Supply and Ready lights are on, 'Cartridge Very Low' displays, and the printer stops printing

If you have completed all the previous steps and the issue persists, continue to the Service the printer section at the end of this document.

This condition occurs when the toner cartridge is very low and the Very Low Supply setting is set to Stop. You can continue printing until the print quality is no longer acceptable, or you can replace the toner cartridge.

The Attention light blinks, and the Supply and Ready lights are on

Step 1: Replace the very low toner cartridge

Replace the toner cartridge with a new toner cartridge.

For more information about replacing the toner cartridge, go to Replacing the Toner Cartridge.

Try to print. If the issue persists, continue to the next step.

Attention and Supply lights blink, and the Ready light is on

If you have completed all the previous steps and the issue persists, continue to the Service the printer section at the end of this document.

There is an issue with the toner cartridge.

The Attention and Supplies lights are blinking

Attention and Supply lights blink, the Ready light is on, and 'Cartridge Memory Appears to be Missing' displays

This condition occurs when one of the following issues is detected:

The toner cartridge is missing
The toner cartridge memory chip is missing
The toner cartridge packaging material is not removed

Step 1: Install the toner cartridge

If the toner cartridge is missing, install the toner cartridge.

For more information about removing and installing the toner cartridge, go to Replacing the Toner Cartridge.

If the toner cartridge is not missing, continue to the next step.

Step 2: Examine the toner cartridge

Open the toner cartridge access door, make sure the memory chip is not missing or damaged, and then make sure the toner cartridge packing material is removed.

Open the toner cartridge door.
Grasp the handle on the toner cartridge, and then pull the toner cartridge out to remove it.
Make sure the toner cartridge packing material is removed.
Examine the memory chip for damage.

If the memory chip is missing or damaged, replace the toner cartridge.
Align the toner cartridge with the tracks inside the printer, and then push the toner cartridge until it is firmly seated.

Try to print. If the issue persists, continue to the next step.

Step 3: Service the printer

If you have completed all the previous steps and the issue persists, continue to the Service the printer section at the end of this document.

Attention and Supply lights blink, the Ready light is on, and 'Supply Memory Error' displays

The printer is unable to detect the toner cartridge memory, and must

Replace the toner cartridge with a new toner cartridge.

For more information about replacing the toner cartridge, go to Replacing the Toner Cartridge.

Try to print. If the issue persists, continue to the next step.

Attention and Supply lights blink, the Ready light is on, and 'HP Protected Cartridge Installed' displays

If you have completed all the previous steps and the issue persists, continue to the Service the printer section at the end of this document.

This condition occurs when the toner cartridge has been protected on another printer. To resolve the issue, replace the toner cartridge.

Replace the toner cartridge with a new toner cartridge.

For more information about replacing the toner cartridge, go to Replacing the Toner Cartridge.

Try to print. If the issue persists, continue to the next step.

Attention and Supply lights blink, and 'Incompatible Cartridge' displays

If you have completed all the previous steps and the issue persists, continue to the Service the printer section at the end of this document.

This condition occurs when the toner cartridge is not compatible with the printer. To resolve the issue, replace the toner cartridge.

Replace the toner cartridge with a new toner cartridge.

For more information about replacing the toner cartridge, go to Replacing the Toner Cartridge.

Try to print. If the issue persists, continue to the next step.

Attention and Supply lights blink, the Ready light is on, and 'Unauthorized Cartridge' displays

If you have completed all the previous steps and the issue persists, continue to the Service the printer section at the end of this document.

This condition occurs when the toner cartridge is unauthorized. To resolve the issue, replace it with a genuine HP toner cartridge.

Replace the toner cartridge with a genuine HP toner cartridge.

For more information about replacing the toner cartridge, go to Replacing the Toner Cartridge.

Try to print. If the issue persists, continue to the next step.