HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers [How to Fix]

In this article, we will discuss the meaning of HP printer warning lights on HP LaserJet MFP M139 – M142 printers and how to clear the warning lights.

HP LaserJet MFP M140w Wireless Monochrome All-in-One Printer (7MD72F)

Blinking Attention Light – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

The attention light will continue to blink when HP LaserJet MFP M139 – M142 printers enter an error state and the user has to resolve the issue urgently.

We will discuss several blinking attention light scenarios on HP LaserJet Pro P1109w, P1109, P1108, P1106, P1102w, P1102s, M12w, and M12a printers and how to resolve the error.

Fast Blinking Attention Light (Only for HP+ Printers) – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

If the attention light on your HP+ printer blinks 4 times within every 3 seconds, then it might be that your printer doesn’t have an internet connection, or your HP account has an issue.

To resolve the problem, do the steps below:

Step 1: Look for and press your printer’s “Start Copy/Resume” button on the control panel.

This action will print an information page.

Step 2: Evaluate the printed page for further information regarding the problem.

Step 3: Locate and open the HP Smart app on your computer.

Step 4: Fix the issues highlighted on the information page or shown in the HP Smart App.

Blinking Attention Light and Go/02 or 01 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This occurs when your printer is still processing a two-sided (duplex) or manual feed print job and then the job cannot be completed until the paper is reloaded into the input tray.

Therefore, to resolve the problem, do the steps below:

Step 1: Load the paper into your printer’s input tray by following the instructions below that apply to the print job at hand.

  • Manual Feed: Load the input tray with paper.
  • Manual duplex: Take out the printed pages from your printer’s output tray and then load them into the input tray with the printed side facing down while the paper stack’s top edge is towards your printer.

Step 2: Slide the width guides on the input tray to hold the paper stack.

Do not slide the guides so much that they squeeze the paper stack.

Step 3: Press the printer’s “Stay Copy/Resume” button.

Your printer will then print.

Blinking Attention Light and Go/03 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

When this happens, it means that the paper in the input tray isn’t the right size as the print job.

Therefore, to fix the issue, you need to load your printer with the right paper size. Alternatively, you can change the size in the print settings. After doing that, press the printer’s “Start Copy/Resume” button.

You can also read this article: HP Printer Error Paper Mismatch [How to Fix] to find out more about this issue.

HP LaserJet MFP M140we All-in-One Wireless Black & White Printer with HP+ and Bonus 6 Months Instant Ink (7MD72E)

Blinking Attention Light and Go/05 or Go/06 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This occurs when your printer receives a request to connect to a network via Wi-Fi Direct.

i. If Go/05 is displayed, open the HP Smart app and input the Wi-Fi Direct PIN.

You can find the IP address by printing a network configuration page. To print a configuration page on HP LaserJet MFP M139 – M142 printers, do these:

Step 1: Press down the printer’s “Start Copy/Resume” button for about 5 seconds.

Step 2: Let go of the button when the Ready light starts to blink.

Your printer will then print the configuration report.

You can read this article: HP Configuration Page [How To/Issues & Solutions] to learn how to print a configuration page on other HP printer models.

ii. If Go/06 is displayed, press your printer’s “Start Copy/Resume” button to initiate the connection via Wi-Fi Direct.

Blinking Attention Light and P2 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This warning is displayed when you’ve copied one side of an ID card and the printer is waiting for the second side to be copied.

Therefore, to clear this notification, turn the ID card to the other side, and then locate and press your printer’s “Copy” button.

Blinking Attention Light and Er/01 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 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. Follow the steps below to do this:

Step 1: Load your printer’s input tray with paper.

Step 2: Slide the width guides on the input tray to hold the paper stack.

Do not slide the guides so much that they squeeze the paper stack.

Step 3: If your printer doesn’t print automatically, press the printer’s “Start Copy/Resume” button.

Blinking Attention Light and Er/02 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

When this happens, it means that the toner 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 Er/03 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

The attention light will blink and Er/03 will be displayed when your HP printer cannot feed paper to enable printing. This error is also known as an “out of paper” error.

To resolve this error, you need to check if there are any defects in the printer’s input trays, and also clean the printer’s paper pickup roller.

Do the following tasks to resolve the blinking attention light and Er/03 error on HP LaserJet MFP M139 – M142 printers.

1. Check and Reload the Paper

You need to check the stack of the loaded paper in the input tray for tears, wrinkles, etc. that might prevent the paper from being picked up. Follow the steps below to do this:

Step 1: Take out the loaded paper from your printer’s input tray.

Step 2: Take out any sheet of paper that is torn, wrinkled, or bent from the stack.

Step 3: Check inside the input tray for obstructions. If you find any, remove them.

Ensure that nothing is blocking the paper stack from contacting the printer’s pickup rollers.

Step 4: Load the input tray with paper.

Step 5: Move the input tray width guides to hold the stack of paper in place against its edges.

Ensure that the guides do not squeeze the paper stack.

After doing the above steps, check if the error is resolved.

If the error persists, do the next task.

HP Printer Paper | 8.5 x 11 Paper | Premium 32 lb | 1 Ream - 250 Sheets | 100 Bright | Made in USA - FSC Certified | 113500R

2. Print a Cleaning Page

To print a cleaning page on HP LaserJet MFP M139 – M142 printers, do the following steps:

Step 1: Ensure that there is paper in the printer’s main input tray.

Step 2: Turn on your HP printer.

Step 3: Open the HP Device Toolbox, Printer Home Page, or Advanced Settings.

i. HP Smart App

  • Open the HP Smart app.
  • Click on the image or name of your HP printer.
  • Choose “Printer Settings” (this might not be necessary in some cases).
  • Choose “Advanced Settings.”

ii. HP Printer Assistant on Windows 7

  • Run a Windows search and open “HP.”
  • Open the “HP Printer Assistant.”
  • Choose “Print.”
  • Click on “HP Device Toolbox” or “Printer Home Page (EWS).”

Step 4: Click on “System Service.”

Step 5: Enter your printer’s username as well as password if you get a prompt to do so.

Note: The username and password can be found under your printer’s toner access door. You can use these details if they’ve not been changed.

Step 6: Find “Fuser Cleaning Mode.”

Step 7: Click on “Start.”

Step 8: Click on “OK.”

This action will cause your printer’s Attention light to blink.

Step 9: Press the button labeled “Resume/Cancel” on your printer’s control panel.

The fuser will be cleaned using a sheet of paper.

Step 10: Take out the paper sheet from the printer’s output bin and discard it.

Check if the error has been fixed.

If the error persists, try the next task.

3. Clean your Printer’s Pickup Rollers

To clean your printer’s pickup rollers, 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 power cable from the power source it is connected to.

Step 4: Open your printer’s toner access door.

Step 5: Take out the toner cartridge from your HP printer.

Step 6: Find the pickup rollers.

Step 7: Use distilled water to dampen a fluff-free fabric.

The fabric should be lightly dampened. To ensure this, squeeze the fabric to remove the excess water.

Step 8: Use the dampened fabric to clean the rollers.

Clean each pickup roller individually before cleaning the next one.

Step 9: Wait for the pickup rollers to get completely dry.

You might have to wait for about 10 minutes for this to happen.

Step 10: Reinsert the toner cartridge into your HP printer.

Step 11: Close your printer’s toner access door.

Step 12: Plug the printer’s power cable into an electrical wall outlet.

Step 13: Plug the cable into your HP printer.

Step 14: Turn on your HP printer.

Check if the error is resolved.

If the error is unresolved, do the next task.

Original HP 26A Black Toner Cartridge | Works with HP LaserJet Pro M402 Series, HP LaserJet Pro MFP M426 Series | CF226A

4. Service your HP Printer

To service your HP printer, contact HP Customer Support and fix a repair or replacement date for your printer. Folks living in Asia Pacific are usually directed to any nearest local service center.

The repair will be free if your HP printer is still under warranty. You will also get a free replacement if the printer cannot be repaired.

We recommend that you read these other articles to learn more about resolving the blinking attention light and Er/03 error on HP LaserJet MFP M139 – M142 printers:

HP Printer Says Out Of Paper [Solutions]

HP Printer Error No Paper Pickup [How to Fix]

HP Printer Not Picking Up Paper [Solved]

Blinking Attention Light and Er/04, Er/05, or Er/06 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

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

  • Paper Jam
  • Paper Jam in Input Tray
  • Paper Jam in Fuser
  • Paper Jam in Output Bin
  • Paper Jam in Cartridge Area

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.

To resolve the blinking attention light and paper jam error (Er/04, Er/05, or Er/06) on HP LaserJet MFP M139 – M142 printers, do the following tasks:

1. Remove the Paper Jam

To remove the paper jam in HP LaserJet MFP 139 – M142 printers, 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: Remove the jammed paper or items from your printer’s output bin by pulling it with both hands.

Step 4: Open your printer’s toner access door.

Step 5: Take out the toner cartridge from your HP printer.

Step 6: Remove the paper stack from your printer’s input tray.

Step 7: Check for paper or any debris jammed within your printer. if you find any, pull it out with both hands.

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

Step 9: Push the cartridge into your printer and ensure that it is firmly secured.

Step 10: Close your printer’s toner access door.

Step 11: Plug the power cable back into your HP printer.

Step 12: Turn on your HP printer.

Check if the error message and the blinking attention light have cleared.

If these issues persist, then you need to service your HP printer.

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]

HP Printer Paper | 8.5 x 11 Paper | Office 20 lb | 3 Ream Case - 1500 Sheets | 92 Bright | Made in USA - FSC Certified | 112090C

Blinking Attention Light and Er/04, Er/05, or Er/06 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

If this occurs, it is a result of an internal error that your printer has suffered from. To resolve this issue, locate and press the button labeled “Start Copy/Resume” on your printer’s control panel.

If you still encounter the issue, reset your printer.

How to Reset HP LaserJet MFP M139 – M142 Printers

To reset HP LaserJet MFP M139 – M142 printers, do the following steps:

Step 1: While your HP printer is on, remove the printer’s power cable from your printer.

Step 2: Remove the cable from its connected power source.

Step 3: Wait for about 60 seconds.

Step 4: Plug the power cable into an electrical wall outlet.

Step 5: Plug the power cable into your HP printer.

Step 6: Turn on your HP printer.

After the reset check if the issue is resolved.

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

Blinking Attention Light and Er/81 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This error happens when your HP printer is unable to install the recent firmware update.

To resolve this error, press the button labeled “Start Copy/Resume” on your printer’s control panel. After doing that, use any of the methods below to update your printer firmware.

How to Update the Firmware of HP LaserJet MFP M139 – M142 Printers via HP Smart App

To update the firmware of HP LaserJet MFP M139 – M142 printers via the HP Smart App, do the following steps:

Step 1: Open the HP Smart app.

If you don’t have the app, you can get it from your device’s app store.

Step 2: Create a new account if you don’t have one. If you have one, just sign in to your account.

Step 3: First-time users of the app will need to create a new HP account for those that don’t have one, or sign in if you already have an account.

This is necessary to enable you to get full access to all the functions of your HP printer while using the app.

Step 4: Check the home screen of the HP Smart app, and then choose the image or name of your HP printer.

Step 4: Choose “Printer Home Page (EWS)” or “Advanced Settings” under “Advanced.”

Step 5: Choose “Web Services” or “Tools.”

Step 6: Enter the admin PIN or password of your HP printer if you are prompted to do so.

We recommend reading this article: HP Printer Password [How To, Problems & Solutions] for further information on HP printer passwords.

Step 7: Click on “Product Update” or “Printer Updates.”

Step 8: Click on “Check Now.”

If there is an available update, it will be downloaded and installed automatically on your HP printer.

Caution: Ensure that you don’t turn off your HP printer while the firmware update is in process. Turning off your printer during the update can lead to permanent damage to your device.

HP LaserJet Pro M15w Wireless Monochrome Printer, works with Alexa (W2G51A)

How to Update the Firmware of HP LaserJet MFP M139 – M142 Printers via Firmware Update Utility

To update the firmware of HP LaserJet MFP M139 – M142 printers via the Firmware Update Utility on Windows and Mac computers, do the following steps:

Step 1: Open a web browser on your computer and go to this website.

Step 2: Identify your HP printer by following the on-screen prompts.

Step 3: Open the section labeled “Firmware” when the HP software and drivers page opens.

Step 4: Click on the “Download” option beside “Firmware Update Utility.”

Step 5: Install and open the utility software by following the on-screen prompts.

Step 6: Check if there are any firmware updates, and then download them.

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 Supplies Light – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

If you see the supplies light blinking 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 in the cartridge is low or very low. Any of these messages often accompanies the blinking supplies light and Er/08 error code:

  • Cartridge Low
  • Cartridge Very Low

Although this error occurs when the toner cartridge is low or 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 – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

To install a replacement toner cartridge in HP LaserJet MFP 139 – M142 printers, do the following steps:

Step 1: Open your printer’s toner access door.

Step 2: Take out the toner cartridge from your HP printer.

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 toner access door.

Step 11: 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 Supplies Lights – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

When the attention and the supplies lights on an HP LaserJet MFP 139 – M142 printer begins to blink, it is an indication that the toner cartridge has an issue. We will discuss some of these issues and how to resolve them.

HP 144A | W1144A | Toner | Black-Drum

Blinking Attention and Supplies Lights and Er/07 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 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 MFP M139 – M142 Printers

To reinstall the toner cartridge in HP LaserJet MFP M139 – M142 printers, do the following steps:

Step 1: Open your printer’s toner access door.

Step 2: Take out the toner cartridge from your HP printer.

Step 3: 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 toner access door.

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

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

Blinking Attention and Supplies Lights and Er/11 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This indicates that the cartridge was installed into the printer with the orange clips or sealing tape or in some cases both packing materials. Therefore, to resolve this problem, you need to check your cartridge and then remove those materials if you didn’t remove them initially.

How to Check the Cartridge for Orange Clips and Sealing Tape in HP LaserJet MFP M139 – M142 Printers

To check the cartridge for the orange clips and sealing tape in HP LaserJet MFP M139 – M142 printers, do the following steps:

Step 1: Open your printer’s toner access door.

Step 2: Take out the toner cartridge from your HP printer.

Step 3: Check the cartridge for the orange clips. If you find them, remove them.

Step 4: Check the cartridge for the sealing tape. If you find it, pull it out from the toner cartridge.

Step 5: Align the toner cartridge with the cartridge paths within your HP printer.

Step 6: Push the cartridge into your printer and ensure that it is well seated.

Step 7: Close your printer’s toner access door.

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

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

Blinking Attention and Supplies Lights and Er/14 or Er/17 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

When this occurs, it means that your printer does not support the toner cartridge or there is an issue with the cartridge. Apart from the blinking lights and error code, you might get any of these messages:

  • Incompatible Cartridge
  • Unauthorized Cartridge
  • HP Protected Cartridge Installed 

To fix this problem, you have to replace the cartridge with a genuine HP toner cartridge that is compatible with your HP printer.

Follow the instructions we shared in the “How to Install Replacement Toner Cartridge in HP LaserJet MFP 139 – M142 Printers” subsection of this article to replace the toner cartridge.

If replacing the cartridge fails to fix the problem, then you need to service your HP printer.

Original HP 85A Black Toner Cartridge | Works with HP LaserJet Pro P1102, P1109 Series, HP LaserJet Pro MFP M1212, M1217 Series | CE285A

Blinking Attention and Ready Lights – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

When the attention and the ready lights on an HP LaserJet MFP 139 – M142 printer begins to blink, then the printer has entered into an error state. We will discuss some of these errors and how to resolve them.

Blinking Attention and Ready Lights and Er/30 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This occurs when the printer’s scanner has an issue. To fix this error, reset your HP printer. To reset your HP printer, follow the steps we shared in the “How to Reset HP LaserJet MFP M139 – M142 Printers” subsection of this article.

After resetting the printer, check if the error is resolved.

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

Blinking Attention and Ready Lights and Er/50 – Er/59, Er/74, Er/76, or Er/77 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This occurs when the printer has an internal issue. To fix this error, reset your HP printer. To reset your HP printer, follow the steps we shared in the “How to Reset HP LaserJet MFP M139 – M142 Printers” subsection of this article.

After resetting the printer, check if the error is resolved.

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

Blinking Attention and Ready Lights and Er/66 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This occurs when the printer’s wireless hardware has an issue. Press the button labeled “Start Copy/Resume” to resume printing via a USB connection instead of via a wireless connection.

To fix this problem, reset your HP printer. To reset your HP printer, follow the steps we shared in the “How to Reset HP LaserJet MFP M139 – M142 Printers” subsection of this article.

After resetting the printer, check if the error is resolved.

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

Blinking Attention and Ready Lights and Er/75 is Displayed – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

This occurs when the printer is unable to establish an internet connection needed to verify the status of the toner supply. To fix this issue, you need to re-establish the connection of your HP printer to the Wi-Fi network.

Read this article: HP Printer Setup to Wi-Fi [Quick Guide] to learn how to set up a connection to your Wi-Fi network on your HP printer.

Blinking Wireless Light – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

When the wireless light on HP LaserJet MFP 139 – M142 printers is blinking, then it means that your printer is trying to establish a wireless connection via Wi-Fi Direct or Wireless Setup Mode. Once the connection is established, the wireless light will become solid.

If you see the “Er/61” error code displayed, then it means that your printer failed to establish the WPS connection. In such a case, locate and press the printer’s “Cancel” button. After doing that, try to re-establish the connection again.

HP LaserJet Enterprise MFP M430f Monochrome All-in-One Printer with built-in Ethernet & 2-sided printing (3PZ55A)

How to Clear Blinking Wireless Light – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

To clear the blinking wireless light on HP LaserJet MFP 139 – M142 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. Troubleshoot your Wireless Connection

i. If the network connection is poor, move your HP printer and the device used to send the print job closer to your wireless router. After doing that, check the signal quality if it has improved. You can confirm if the signal quality has improved by visiting a website on your mobile device or computer that is connected to the wireless network. Check the speed of the connection and if it is functioning properly. If the speed is intermittent or slow, restart your router by removing its power cable, and then wait for about 15 seconds before your plug the power cable into your printer.

ii. If the printer is in sleep mode or off, press the button labeled “Start Copy/Resume” on the control panel. This action will wake your printer and send it into a ready state. Note that there are times when the status of your printer might be displayed as “Offline” even when it is ready.

iii. Reconnect your HP printer to your wireless network by doing the following:

  • Move your HP printer close to your router to ensure that it is within the signal range.
  • Restore the Wireless Setup Mode (also known as Wi-Fi Setup Mode).

Click this link: Restore the HP Printer Wi-Fi Setup Mode – HP Printer Setup to Wi-Fi to learn how to restore the Wireless Setup Mode.

  • Press the printer’s “Cancel” button.
  • Press down the “Wireless” and “Cancel” buttons at once for about 5 seconds before releasing it.
  • Once your HP printer restarts, locate and open the HP Smart app on your PC or mobile device. If you don’t have the app, go to your app store to download it.
  • Once the app is opened, reconnect your HP printer to the network by following the onscreen prompts.

iv. Restart all your devices: Restart your HP printer, PC or mobile device, and router to get rid of the error conditions encountered.

v. Print out a Wireless Network Test Report and then evaluate the report to discover the issues that your Wi-Fi connection might be facing.

To print the Wireless Network Test Report, do the following:

  • Press your printer’s “Cancel” button on the control panel. This action will wake your printer.
  • Press down the “Start Copy/Resume” and “Wireless” buttons together until you see the printer’s Ready light blinking.

vi. Enable Bluetooth on your printer and mobile device to enable the HP Smart app to detect your printer and establish the connection.

After doing the above troubleshooting, connect your HP printer to your wireless network.   

Blinking Attention and Ready Lights – HP Printer Warning Lights on HP LaserJet MFP M139 – M142 Printers

When the attention and ready lights on HP LaserJet MFP 139 – M142 printers are blinking, then it means that your printer is cooling down, cleaning, or initializing. In this case, you just need to allow your printer complete the process before you resume printing.