HP Deskjet Plus 4100 all-in-one printer

[Taff681]

printer off line with 2 flashing red lights and flashing blue light

[Max3Aj]

@Taff681, Welcome to HP Support Community. 

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

The issue you're describing with your HP DeskJet Plus 4120 All-in-One Printer — showing two flashing red lights and a flashing blue light — typically indicates a paper jam, low ink, or connection issue. Here's how to troubleshoot it step-by-step:

🔴 Flashing Red Lights (usually Ink & Error icons)

These commonly mean:

1. Low/empty ink or ink cartridge issue
2. Paper jam or paper feed issue

🔵 Flashing Blue Wireless Light

This usually means the printer is trying to connect to Wi-Fi but isn’t successfully connected.

 

Check for Paper Jam

• Open the input tray, output tray, and cartridge access area.
• Remove any jammed or stuck paper.
• Gently move the rollers with your fingers to clear them.

Check Ink Cartridges

• Open the ink cartridge access door.
• Make sure both cartridges are installed correctly.
• Remove and reinsert each cartridge to reseat them.
• If either cartridge is low or faulty, replace it.

If you see the cartridge icons blinking, it usually indicates a problem with ink detection or the cartridges themselves.
 

Fix Wi-Fi Issue

• The flashing blue wireless light means it’s not connected to Wi-Fi.
  • Press and hold the Wireless button on the printer for 3 seconds until it starts blinking.
  • Then open the HP Smart app on your phone or computer and re-add the printer.
  • Follow prompts to connect it back to your Wi-Fi.

Make sure your phone/computer is on the same Wi-Fi network you're connecting the printer to.

Power Cycle

• Unplug the printer from power.
• Wait 60 seconds.
• Plug it back in and turn it on.

If the Problem Persists:

• Download and run the HP Print and Scan Doctor (for Windows).
• Or, reset the printer:
  • Press and hold the Cancel + Wireless buttons together for about 10 seconds to restore factory settings. 

I hope this helps. 

Take care and have a good day. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Select "Yes" on the bottom left to say “Thanks” for helping! 

Max3Aj

HP Support