HP Laserjet M139-M142 offline won't connect

[Romai]

My printer is offline, blue light flashing, and I can't get it to connect to my WiFi. 

[VikramTheGreat]

Hi @Romai,

Welcome to the HP Support Community.
 

Thank you for posting your query. I will be glad to help you.

I know how frustrating this is. Your HP LaserJet M139–M142 showing offline with a flashing blue light means it’s stuck trying to connect to Wi-Fi, and you’ve probably tried the basics already. Let’s go through the most effective steps to get it back online.

What the Flashing Blue Light Means

• The printer is in Wi-Fi setup mode or has lost connection.
• It’s not connected to your wireless network yet.

Recommended Fix

Step 1: Restart Everything

• Power off the printer and unplug it for 60 seconds.
• Restart your router.
• Power the printer back on.

Step 2: Reconnect Using HP App

1. Download HP app (Windows, macOS, iOS, Android):
   👉 HP App – For HP Printers, Laptops, and Tech Accessories | HP® Official Site
2. Open HP app → Add Printer.
3. When the blue light is flashing, the printer is ready for setup.
4. Follow the on-screen steps to connect to your Wi-Fi.

Step 3: Manual Wi-Fi Reset

• On the printer: 
  • Press and hold the Wireless button for 5 seconds until the light blinks fast.
  • This resets the network settings.
• Then retry setup via the HP app.

Step 4: Update Firmware

• Once connected, update firmware: 👉 HP LaserJet MFP M139-M142 Printer series | HP® Support

✅ If Still Offline

• Check your router: 
  • Ensure the 2.4 GHz band is enabled (LaserJet MFPs don’t support 5 GHz).
  • Disable MAC filtering or add the printer’s MAC address.
• If nothing works, contact HP Support for advanced help

I hope this helps.

Take care and have an amazing day!
 

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Regards,

VikramTheGreat