HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers [How to Fix]

In this article, we will discuss the meaning of HP printer warning lights on HP LaserJet Pro M28 – M31w printers and how to clear the warning lights.

Note: The guide below is for HP LaserJet Pro M28w, M29w, M30w, and M31w printers.

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Table of Contents

Blinking Wireless Light – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

When the wireless light on HP LaserJet Pro M28 – M31w printers is blinking, it is an indication that the wireless network is either configuring, your printer is unable to find the wireless signal, or the printer is unable to connect to the wireless network.

How to Clear Blinking Wireless Light on HP LaserJet Pro M28 – M31w Printers – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

To clear the blinking wireless light on HP LaserJet Pro M28 – M31w printers, do the following:

1. Allow Your Printer to Connect to the Wireless Network

Sometimes, your HP printer might need some minutes for it to connect to your wireless network (access point or router). Therefore, when the wireless light is blinking, you need to be patient while the connection is established. After waiting for some minutes, then you can check the status of the wireless light.

If you discover that your printer’s wireless light is turned on and solid, then it means that the connection is established. Therefore, you don’t need to do any other troubleshooting.

If you check and the light continues to blink, do the next task.

2. Check if the Wireless Network has Issues

Check the following as they might be the reason why your HP printer is not connecting:

i. The wireless network is inactive, or the signal strength is low.  

To confirm that the network is active, check if your access point or router is turned on. Also, check the signal strength and confirm that it is strong.

You can move your printer closer to your router or access point to increase the signal strength. It is recommended that your printer and your router should not be farther away than 3 feet to 5 feet (1.0 to 1.5 meters).

ii. Your printer is in standby or sleep mode.

You need to check your printer and wake it from sleep mode if it is not in ready mode. We recommend that you read this article: HP Printer Sleep Mode [How To, Issues & Solutions] to learn more about HP printer sleep mode. 

iii. Your computer firewall is preventing your printer from connecting to your computer and network.

In this case, you need to temporarily disable your firewall, and then check if the connection is established and the wireless light has stopped blinking.

If the light becomes solid, then the firewall is responsible for the warning light. Therefore, you have to use the printer without enabling the firewall. However, make sure that you enable it when you are done with your printer.

If your printer’s wireless light continues to blink after disabling the firewall, then the firewall is not responsible for the blinking light. Therefore, you need to enable the firewall immediately.

iv. The signal of your wireless network is being interfered with by a device that is emitting radio signals (for example a cordless telephone or microwave).

If you have such devices close to your printer or router, you need to move them away.

v. A VPN (Virtual Private Network) is preventing your printer from your wireless network and computer.

After correcting each item listed above, check if the wireless light has stopped blinking.

If the wireless light becomes steady, then you don’t need to do any other troubleshooting.

However, if the light continues to blink, do the next task.

3. Connect your HP Printer to the Wireless Network

 At this point, you need to connect your HP printer to your wireless network. Consult your printer manual to learn the process of doing this. 

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Blinking Attention and Ready Lights – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

When the attention and the ready lights on an HP LaserJet Pro M28 – M31w printer begin to blink, then the printer has gotten too hot. To resolve this problem, stop printing and allow the printer to cool down. Once the printer cools down, you can resume printing.

We recommend that you read this article: HP Printer Warning [Detailed Guide] to learn about other HP printer warnings that you might encounter when using your HP printer.

Blinking Attention Light and Er/01 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

This occurs when there is no paper in the printer’s input tray. When you see this warning, you need to reload the paper into the tray.

How to Load Plain A4 or U.S. Letter Size Paper into the Input Tray of HP LaserJet Pro M28 – M31w Printers

To load plain A4 or U.S. letter size paper into the input tray of HP LaserJet Pro M28 – M31w printers, do the following steps:

Step 1: Pull the output tray downwards.

Step 2: Pull the input as well as the output tray extensions outwards.

Step 3: Place a stack of A4 or U.S. letter-size paper into your printer’s input tray.

Ensure that the print side is facing up and the stack is well into the printer.

Caution: Do not overload the input tray to avoid paper jams.

Step 4: Move the paper width guides to the sides of the stack.

Ensure that you don’t push the guides so much that they squeeze the paper.

Note: Do not forget to choose the right paper type and paper size settings in the print settings when you want to print or copy after the paper is loaded.

How to Load Envelopes into the Input Tray of HP LaserJet Pro M28 – M31w Printers

Guidelines

i. You can load a maximum of 5 envelopes into the tray.

ii. Don’t use envelopes that have coated linings, self-stick adhesives, windows, snaps, clasps, or heat-susceptible synthetic materials.

iii. If the envelope has peel-off adhesive strips, then you need to ensure that the envelope can be used by laser printers.

iv. Use only envelopes designed for laser printers.

v. Don’t use wrinkled, stuck-together, nicked, or any form of damaged envelope.

vi. Use envelopes that have seams extending to the corners.

Loading the Envelopes in HP LaserJet Pro M28 – M31w Printers

To load envelopes into the input tray of HP LaserJet Pro M28 – M31w printers, do the following steps:

Step 1: Pull the output tray downwards.

Step 2: Pull the input as well as the output tray extensions outwards.

Step 3: Place a maximum of 5 envelopes in the tray with the print side facing up.

Ensure that the envelopes go all the way into the printer.

  • If the flap of the envelope is designed on the short edge, then you need to place the envelope in a way that the flap side faces up while the short edge is inserted into your printer without the flap.
  • If the flap of the envelope is designed on the long edge, then you need to place the envelope in a way that the flap side faces down while the short postage edge is inserted into the printer.

Step 4: Move the paper width guides to the sides of the stack.

Ensure that you don’t push the guides so much that they squeeze the paper.

Note: Do not forget to choose the right paper type and paper size settings in the print settings when you want to print or copy after the paper is loaded.

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Blinking Attention Light and Solid Ready Light while Er/02 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

When this happens, it means that the toner cartridge access door of your HP printer is open. To clear the displayed message and blinking light, close the printer’s toner access door.

Blinking Attention Light and Solid Ready Light while Er/04, Er/05, or Er/06 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

When this happens, it means that there is paper jammed in your printer. You might see any of these messages:

  • Printer Paper Jam
  • Paper Jam Output Tray
  • Paper Jam in Tray

To solve this error, you need to clear the paper jam. If there is no paper jammed in your printer, then you have to reset your HP printer.

How to Clear Paper Jam in HP LaserJet Pro M28 – M31w Printers – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

To clear the paper jam in HP LaserJet Pro M28 – M31w Printers, the first thing you need to do is to locate where the jam occurred in the printer.

We will guide you on how to remove paper jams from different parts of HP LaserJet Pro M28 – M31w printers. If you don’t find the paper jam in one part, try the instructions on how to remove the jam in the next until you cover all parts where the jam might occur.

How to Clear Paper Jam from the Input Tray of HP LaserJet Pro M28 – M31w Printers

To clear the paper jam from the input tray of HP LaserJet Pro M28 – M31w printers, do the steps below:

Step 1: Open your printer’s cartridge door.

Step 2: Take out the cartridge from your printer.

Step 3: Take out the stack of paper from your printer’s input tray.

Step 4: Hold the visible jammed paper with both hands and gently pull it from the printer.

Step 5: Reinstall the cartridge into your HP printer.

Step 6: Close your printer’s cartridge door.

Check if the error code and blinking light have disappeared.

If you still see the error code and the blinking light, check the next area for the paper jam.

How to Clear Paper Jam from the Output Bin of HP LaserJet Pro M28 – M31w Printers

To clear the paper jam from the output Bin of HP LaserJet Pro M28 – M31w printers, do the steps below:

Step 1: Open your printer’s cartridge door.

Step 2: Take out the cartridge from your printer.

Step 3: Hold the visible jammed paper with both hands and gently pull it from the printer’s output bin.

Step 4: Reinstall the cartridge into your HP printer.

Step 6: Close your printer’s cartridge door.

Check if the error code and blinking light have disappeared.

If you still see the error code and the blinking light, check the next area for the paper jam.

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How to Clear Paper Jam from the Cartridge Access Area of HP LaserJet Pro M28 – M31w Printers

To clear the paper jam from the cartridge access area of HP LaserJet Pro M28 – M31w printers, do the steps below:

Step 1: Turn your HP printer off.

Step 2: Unplug the printer’s power cable from the wall outlet.

Step 3: Open your printer’s cartridge door.

Step 4: Take out the cartridge from your printer.

Step 5: Hold the visible jammed paper with both hands and gently pull it from the printer’s cartridge access area.

Step 6: Reinstall the cartridge into your HP printer.

Step 7: Close your printer’s cartridge door.

We recommend that you read the following articles for further information on how to resolve paper jams and other printer jam issues:

HP Paper Jam Error Codes [How to Fix]

HP Printer ADF Jam [How to Fix]

HP Printer Jam in Tray 1 [How to Fix]

HP Printer Jam in Tray 2 [How to Fix]

HP Printer Jam in Tray 3 [How to Fix]

HP Printer Jam [Issues & Solutions]

Check if the error code and blinking light have disappeared.

If you still see the error code and the blinking light, then you need to reset your printer.

How to Reset HP LaserJet Pro M28 – M31w Printers

To reset an HP LaserJet Pro M28 – M31w printer, do the following steps:

Step 1: Turn on your HP printer (if it is not turned on).

Step 2: Remove the printer’s power cable from your HP printer.

Step 3: Unplug the printer’s power cable from its connected power source.

Step 4: Wait for about 60 seconds.

Step 5: Plug the power cable into a wall outlet as recommended by HP.

Check if the error code and blinking light have disappeared.

If you still see the error code and the blinking light, then you need to service your HP printer.

To service your HP printer, contact HP Customer Support and fix a repair date for your printer. If you live in the Asia Pacific, you will be redirected to a service center close to you. 

Printers that are still under warranty will be repaired for free. However, if your printer is no longer under warranty, you will pay the repair fees.

Blinking Attention and Supply Lights, and Solid Ready Light while Er/07 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

This indicates that the cartridge isn’t installed correctly or is missing. Therefore, you need to install the cartridge if it is not installed. If the cartridge is installed, then you need to reinstall the toner cartridge to fix this problem.

How to Reinstall Toner Cartridge in HP LaserJet M28 – M31w Printers – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

To reinstall the toner cartridge in HP LaserJet M28 – M31 printers, do the following steps:

Step 1: Open your printer’s scanner assembly.

Step 2: Open the printer’s top cover.

Step 3: Take out the toner cartridge from your HP printer.

Step 4: Align the toner cartridge with the cartridge paths within your HP printer.

Step 4: Push the cartridge into your printer and ensure that it is well seated.

Step 5: Close your printer’s top cover.

Step 6: Close your printer’s scanner assembly.

After reinstalling the toner cartridge, check if the issue is resolved.

If the issue persists, then you need to service your HP printer.

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Solid Supply and Ready Lights while Er/08 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

If you see solid supply and ready lights and an Er/08 error code is displayed on the control panel of HP LaserJet MFP M139 – M142 printers, then it means that the toner is very low and that the “Continue” option has been selected for the “Very Low Supply” setting.

Although this error occurs when the toner cartridge is very low, you don’t have to change the cartridge until you discover the print quality to be unacceptable. When the print quality becomes unacceptable, then you need to replace the toner cartridge.

How to Install Replacement Toner Cartridge in HP LaserJet M28 – M31w Printers

To install a replacement toner cartridge in HP LaserJet M28 – M31w printers, do the following steps:

Step 1: Open your printer’s scanner assembly.

Step 2: Open the printer’s top cover.

Step 3: Take out the new toner cartridge from the packaging.

Step 4: Remove the cartridge’s orange cover.

Step 5: Hold the cartridge on both sides and then shake it gently sideways about 5 to 6 times to spread the toner evenly within the cartridge.

Caution: Don’t touch the surface of the imaging drum as this could lead to print quality issues.

Step 6: Bend and snap the orange-colored tab.

Step 7: Pull out the sealing tape from the toner cartridge.

Step 8: Align the toner cartridge with the cartridge paths within your HP printer.

Step 9: Push the cartridge into your printer and ensure that it is well seated.

Step 10: Close your printer’s top cover.

Step 11: Close your printer’s scanner assembly.

Step 12: Recycle the used cartridge and its packing materials.

If you still encounter the error after replacing the toner cartridge, then you need to service your HP printer.

Blinking Attention and Supply Lights, and Solid Ready Light while Er/11 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

This happens when any of the following occurs:

i. Missing cartridge memory chip

ii. Unremoved cartridge packing material.

To resolve both causes responsible for the error, you need to examine the installed toner cartridge.

How to Examine Installed Toner Cartridge in HP LaserJet Pro M28 – M31w Printers – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

To examine the installed toner cartridge in HP LaserJet Pro M28 – M31w printers to confirm that the memory chip is intact and there is no cartridge packing material, follow the steps below:

Step 1: Open your printer’s cartridge door.

Step 2: Hold the cartridge handle and pull it out of your HP printer.

Step 3: Check for the packing material.

Confirm that the tab and the tape have been removed. If they were not removed, remove them. Break off the orange tab and then pull out the tape from the cartridge.

Step 5: Check if there is any damage to the cartridge’s memory chip.

If it is damaged or missing, then you need to replace the cartridge.

If there are no damages, then reinstall the cartridge into the printer.

Step 6: Align the cartridge with the path within your HP printer.

Step 7: Push the cartridge into your printer and ensure that it is firmly seated.

Step 8: Close your printer’s cartridge door.

After replacing the cartridge, check if the problem is fixed.

If the problem persists, service your HP printer.

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Blinking Attention and Supply Lights, and Solid Ready Light while Er/14 or Er/17 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

This happens when the cartridge you installed into your HP printer is either unauthorized or protected on a different HP printer. Whatever the case might be, such a toner cartridge cannot be used in your HP printer.

Therefore, to resolve the problem, you have to replace the toner cartridge.

To replace the toner cartridge on HP LaserJet Pro M28 – M31w printers, follow the instructions we shared under the How to Install Replacement Toner Cartridge in HP LaserJet M28 – M31w Printerssection of this article.

After replacing the toner cartridge, check if the error is resolved.

If the error persists, service your HP printer.

Blinking Attention Light and Solid Ready Light while Er/25 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

When this occurs, it means that the paper loaded into the input tray is not the right size for the current print job.

Therefore, to fix the situation, you need to load the printer’s input tray with the right paper size. Alternatively, you can press the printer’s “Start Copy” button. When you do this, your HP printer will go ahead to print on the loaded paper.

Solid Attention and Ready Lights while Er/30 – Er/66 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

If you get solid attention and ready lights on your HP LaserJet Pro M28 – M31w printers, along with an error code on display that ranges from Er/30 to Er/66, then it means that your printer is in an error state.

To fix this problem, try the solutions below:

1. Reset your HP Printer – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

To reset your HP printer, follow the steps we shared under the How to Reset HP LaserJet Pro M28 – M31w Printerssection of this article.

After your reset your HP printer, check if the issue is resolved.

If you still encounter the issue, do the next solution.

2. Plug your Printer’s Power Cable Straight into a Wall Outlet – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

Follow the steps below to plug your HP printer’s power cable directly into a wall outlet:

Step 1: Remove the printer’s power cable from your HP printer.

Step 2: Remove the printer’s power cable from its connected power source (surge protectors, power strips, etc.)

Step 3: Connect the printer’s power cable directly to a wall outlet.

Step 4: Plug the cable into your HP printer.

Step 5: Turn on your HP printer.

Check if the issue is resolved.

If you still experience the issue, use another outlet as the problem might be the result of a bad electrical wall outlet.

If using the second outlet doesn’t restore the problem, then you need to service your HP printer.

Error: Unknown Link Type

Blinking Attention Light and Solid Ready Light while Er/81 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

This is an indication that the right firmware is not installed on your HP printer. Therefore, to fix this problem, you have to install the right firmware.

To install the right firmware on your HP printer, click this link: Update your HP Printer Firmware – HP Printer is Slow, and then use any of the methods we shared to install your HP printer firmware.

Blinking Attention Light and Solid Ready Light while Go/01 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

When this happens, it means that your HP printer is working in manual paper feed mode.

What you need to do is to load the input tray with the right paper type and size fitting for the current print job. After doing that, resume printing by pressing the printer’s “Start Copy” button.

Blinking Attention Light and Solid Ready Light while Go/02 is Displayed – HP Printer Warning Lights on HP LaserJet Pro M28 – M31w Printers

When this happens, it means that your HP printer is handling a manual duplexing (two-sided) print job. Therefore, your assistance is needed to complete the job.

To complete the job, take out the printed pages of paper from your printer’s output tray and then reload them in your printer’s input tray; ensure that the printed side is facing down. After that, print the other sides by pressing the printer’s “Start Copy” button.