Printer setup Error Code: UU_400_EB000A9900 Save this code if contacting HP Support.

[benoma]

HP Smart is unable to set up printer,  what can I do???

Error Code: UU_400_EB000A9900Save this code if contacting HP Support.

[VikramTheGreat]

Hi @benoma,

Welcome to the HP Support Community.
 

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

I know how frustrating it is when your HP OfficeJet Pro 9135e All-in-One Printer setup fails with HP Smart and shows Error Code: UU_400_EB000A9900. Let’s walk through a solution to resolve the issue.

1. Use HP Smart’s Diagnose & Fix Tool

HP Smart has a built-in tool that can automatically detect and resolve setup issues.

• Open the HP Smart app on your Windows or macOS device.
• Click the wrench icon (bottom left).
• Select Diagnose & Fix and follow the prompts.

🔗HP App – For HP Printers, Laptops, and Tech Accessories | HP® Official Site

2. Check Router Settings (Disable AP Isolation)

Some routers have a setting called AP Isolation, Client Isolation, or Wireless Isolation that blocks devices from communicating on the same network.

• Log in to your router settings.
• Look for AP Isolation or similar under wireless settings.
• Disable it temporarily during printer setup.

🔗HP Printers - Error messages on HP Smart when printer setup or printing on a wireless network due to...

3. Reset Printer and Retry Setup

If the printer is stuck or partially initialized:

• Turn off the printer.
• Unplug it for 60 seconds.
• Plug it back in and turn it on.
• Retry setup using the HP Smart app.

If the printer still won’t respond, try restoring factory defaults via the Embedded Web Server (EWS): 🔗 HP OfficeJet Pro 9135e All-in-One Printer - Troubleshooting | HP® Support

I hope this helps.

Take care and have an amazing day!
 

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Regards,

VikramTheGreat