Model 6978 0x0 printhead problem.

[mrb1]

I've replaced printhead and still get 0x0 error. Any solutions out there?

[Hawks_Eye]

Hi @mrb1 

Welcome to the HP Support Community! We're here to help you get back up and running.

The 0x0 printhead error on the HP OfficeJet Pro 6978—even after replacing the printhead—is a stubborn one, but there are several steps that have helped other users resolve it:

Step-by-Step Troubleshooting

Power Reset

• Turn off the printer.
• Unplug it from the wall and disconnect all cables.
• Wait 60 seconds.
• Reconnect everything and power it back on.

Inspect and Clean the Printhead Contacts

• Remove ink cartridges and gently lift out the printhead.
• Use a lint-free cloth lightly moistened with distilled water or isopropyl alcohol to clean the copper contacts on the printhead and inside the printer.
• Let everything dry completely before reinstalling.

Check Ink Cartridges

• Ensure all cartridges are genuine HP and properly seated.
• Replace any that are expired or low—even if they’re not empty, they can trigger errors.

Firmware Update

• Use the HP Smart app or visit HP’s support site to check for firmware updates.
• An outdated firmware version can misidentify new hardware like a replacement printhead.

Run Printhead Cleaning Utility

• On the printer:
  Home > Settings > Printer Maintenance > Clean Printhead

Use HP’s Diagnose & Fix Tool (Windows)

• In the HP Smart app, click Printer Settings > Diagnose & Fix.
• Let it run a scan—it will automatically fix common connection issues.
  You can also access this tool on HP’s support page if needed.

Hard Reset

• Turn off the printer.
• Disconnect power and all cables.
• Hold the power button for 15 seconds.
• Reconnect and power on.

If the error persists:

• The replacement printhead might not be compatible or properly recognized.
• The printer’s internal logic board may have a fault.
• HP support may need to reset the printer remotely or authorize a replacement.

You're clearly experienced—this one's just being unnecessarily cryptic.

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Take care, and have an amazing day!

Regards, 

Hawks_Eye