E0 error code on HP DeskJet 2742e

[CheekyMonkey75]

E0 error code and all lights flashing and printer is offline.

[VikramTheGreat]

Hi @CheekyMonkey75,

Welcome to the HP Support Community.
 

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

The E0 error code with all lights flashing on your HP DeskJet 2742e usually indicates a serious printer error or initialization failure. It often happens when the printer cannot complete its startup checks or detects a hardware issue.

Here’s what you can do to fix it:

Step 1: Power Reset

• Turn off the printer and unplug the power cord from the wall outlet.
• Wait 60 seconds, give the printer time to fully discharge (like letting it take a deep breath).
• Plug the cord back in and power on the printer.

Step 2: Check Cartridges

• Open the cartridge access door and ensure both cartridges are installed correctly.
• Remove and reseat them gently, like snapping puzzle pieces into place.
• If you see any ink or debris on the contacts, clean them with a lint-free cloth slightly dampened with distilled water.

Step 3: Remove Paper and Check for Jams

• Take out all the paper from the tray.
• Look inside for any tiny scraps or obstructions; sometimes even a small piece feels like a boulder to the rollers.

Step 4: Update Firmware

• Connect the printer to Wi-Fi and check for updates via the HP App.
• Firmware updates often feel like a refresh button for your printer’s brain.

Step 5: Factory Reset (if error persists)

• Press and hold the Cancel + Wireless buttons together for 5 seconds until the lights blink.
• This will restore default settings.

If the error still persists after these steps, it usually means the printer needs service or replacement.

 

For detailed troubleshooting and official guidance, visit:
👉 HP Support – Blinking Lights and Error Codes for DeskJet 2700 Series

I hope this helps.

Take care and have an amazing day!
 

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Regards,

VikramTheGreat