HP OfficeJet 6950- Error Code OXB8356156

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The error code 0xB8356156 on the HP OfficeJet 6950 is a hardware-related printer failure, most commonly associated with the printhead or internal ink system.

It typically indicates that:

• The printhead is not initializing correctly
• There is a temporary internal hardware or firmware fault
• The printer has encountered a critical system error during startup or printing

Troubleshooting steps

1) Clear any paper jam

• Lift the output tray.
• Pull out the input tray to extend it.
• Press the buttons on both sides of the input tray and remove the tray.
• Check for jammed paper in the tray gap and pull it out carefully with both hands.
• Reinsert the tray, reload paper, and lower the output tray.
  
  

2) Check the print zone

• Turn off the printer.
• Open the ink cartridge access door.
• Check the paper path inside the printer.
• Lift the handle of the paper path cover and remove the cover.
• Remove any jammed paper carefully.
• Reinsert the paper path cover until it snaps into place.
• Check the print carriage area for any blocked paper or debris.
• Close the ink cartridge access door and turn the printer back on.
  
  

3) Check for a print carriage jam

• Remove any objects or paper blocking the print carriage.
• Do not use tools to remove jammed paper.
• Use caution when removing anything from inside the printer.
  
  

4) Verify cartridge compatibility

For HP OfficeJet 6950 cartridge numbers by region:

• United States and Canada: HP 902 / 902XL
• Europe, Middle East, and Africa: HP 903 / 903XL
• Latin America: HP 904 / 904XL
• Asia Pacific: HP 905 / 905XL
  Note: That some older 902–909 cartridges with Warranty Ends date of Apr 2021 or earlier might not be compatible with certain OfficeJet 6950 series printers beginning December 1, 2020. Updated cartridges have a Warranty Ends date of May 2021 or later. 
  Ref: HP InkJet Supplies - Updated HP 902-909 and 952-959 ink cartridges
  
  

5) Update printer firmware

Recommending updating the printer firmware to the latest released version.

6) Use HP Utility / printer management tools on Mac

On macOS, HP Utility contains tools to:

• Configure print settings
• Calibrate the printer
• Order supplies online
• Find website support information

To open it:

• Open the Applications folder
• Open the HP folder
• Double-click HP Utility
  
  

7) Access the Embedded Web Server (EWS)

If the printer is connected to a network or Wi-Fi Direct, you can use the Embedded Web Server to:

• View printer status
• Change settings
• Manage the printer from your computer

Note: Some settings may require a password, and some features are unavailable without Internet access.

Possible reasons 

• Paper jam or carriage obstruction
• Paper-feed issue
• Older cartridge version incompatibility
• Firmware needing update
• Network/connection issue if you are managing the printer from Mac tools
  
  

Sources

1. HP InkJet Supplies - Updated HP 902-909 and 952-959 ink cartridges
2. User Guide
3. Which cartridges work with my HP printer?
   
   

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