Printer lost wifi signal and now won't reconnect to wifi despite repeatedly using the instructions H

[Fatbhoyjohn]

My Envy 6400 lost the wifi signal about a week ago. Prior to that, it was working for several years. My wifi signal is strong. I have used the HP guidance to reconnect but despite turning everything off and restarting, and even deleting the printer and reloading, it will not reconnect. My daughter who is tech savvy tried. She managed to get it reconnected but half way through printing a document it stopped again. I am now in set-up mode again. Please help me. 

[Kuroi_Kenshi]

Hi @Fatbhoyjohn,

Welcome to the HP Support Community!

Thanks for reaching out!

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

I understand your HP Envy 6400 series printer lost its Wi‑Fi connection and now won’t reconnect, even after following the setup instructions. Let’s go through a few steps to check what could be causing this.

Power Reset the Printer and Router

Turn off the printer and unplug the power cord for 60 seconds.

Restart your Wi‑Fi router, then power the printer back on.

This clears temporary network faults.

Re‑enable Wireless Setup Mode

On the printer, press and hold the Wireless button until the light starts blinking.

This puts the printer back into setup mode so it can be discovered by HP Smart.

Check Wi‑Fi Band

The Envy 6400 series supports 2.4GHz Wi‑Fi only.

If your router is set to 5GHz or combines both bands, create or enable a dedicated 2.4GHz SSID and connect the printer to that.

Reconnect Using HP Smart App

Open HP Smart on your phone or computer.

Remove the printer if listed, then select Set Up a New Printer.

Follow the prompts until you see “Setup Complete.”

Assign a Static IP (Optional)

Once connected, open the printer’s Embedded Web Server (type its IP address into a browser).

Assign a static IP so the printer doesn’t drop off the network when the router reassigns addresses.

Update Firmware

In HP Smart, go to Printer Settings > Advanced > Update Printer Firmware.

Updates often fix Wi‑Fi stability issues that cause printers to disconnect mid‑job.

I hope this helps.

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Best regards,