Can't connect printer ti Wi-Fi - HP Smart App error code -9

[Jealous25]

Hi,

I've just got a used HP DeskJet 4120e and I can't connect it to my Wi-Fi and computer/smartphone. Everytime I try to connect it, I get the error code -9 in the HP Smart App. I've also logged in to my HP account and tried it again, as I've read in another thread that this might be a solution, but it also doesn't work.

What's the problem here, and how can I solve it?

Best regards

[zoey7886]

@Jealous25, Welcome to the HP Support Community!  

Thanks for reaching out about your query regarding HP Smart App Error Code -9 on HP DeskJet 4120e! 

We're thrilled to have the opportunity to assist you and provide a solution.  

If you're encountering error code -9 on the HP Smart App while trying to connect your HP DeskJet 4120e to Wi-Fi, here are steps to resolve the issue:

Check Wi-Fi Connectivity:

• Ensure your Wi-Fi network is working correctly and that the signal strength is strong enough for the printer to connect.
• Make sure your Wi-Fi router is not set to 5 GHz only as HP DeskJet 4120e typically supports 2.4 GHz Wi-Fi networks.

Restart Devices:

• Restart your printer, router, and the device you are using (computer/smartphone).

Reset Network Settings on Printer:

• Restore the printer's network settings:
  1. Press and hold the Wireless and Cancel buttons on the printer simultaneously for three seconds.
  2. Release the buttons. The wireless light may blink, indicating it’s resetting.

Reinstall HP Smart App:

• Delete and reinstall the HP Smart App on your smartphone or computer to ensure you have the latest version.

Connect the Printer Again:

• Open HP Smart, select “Set up a new printer”, and follow the on-screen instructions to reconnect the printer to your Wi-Fi network.

Enable HP Web Services:

• Make sure to enable HP Web Services on your printer, which may be required for the connection setup. You can usually do this from the printer's settings panel.

HP Account Login:

• Make sure you are logged into your HP account in the HP Smart App during the setup process.  

Hope this helps! 

Take care, and have an amazing day!  

Did we resolve the issue? If yes, Please consider marking this post as "Accepted Solution" and click "Yes" to give us a helpful vote - your feedback keeps us going!  

Regards, 

[Jealous25]

Thanks for your reply!

Unfortunately none of the steps you mentioned worked for me. The problem still remains.

But I've talked to the pre-owner, and he told me that he had an Instant Ink subscription which he canceled on May 15.

So could it be, that the printer is still associated with his account, and I have to wait until the end of the billing period, which is at the end of the month as far as I know?

[Jealous25 · Accepted solution]

I think I've found the solution:

I've changed some settings on my router, and it seems that WPA2 only did the job instead of WPA3+WPA2. I also changed the settings to 802.11n only and deactivated 5GHz. But after I had connected the printer I changed those settings back, and it still works.

So I guess it was the WPA setting. But thanks for the help anyway.

Best regards