You're trying to get your HP DeskJet 4255e onto your WiFi and the HP Smart app keeps saying it can't find the printer. Or maybe it connects in the app but then drops off within a few minutes. This budget-friendly all-in-one uses a 2.4 GHz radio only, so it's sensitive to router settings and network congestion.
The fastest fix is a full power cycle. Unplug the router and the printer from power. Wait 30 seconds, plug the router back in, and let it fully come online (this can take a couple minutes). Then plug the printer back in. Once both are ready, open HP Smart and start a fresh setup. This clears temporary glitches more often than you'd think.
If that didn't get you connected, work through the rest of these fixes. Most DeskJet 4255e WiFi failures come down to just a few things.
Why the 4255e Won't Join Your Network
The DeskJet 4255e was released in 2022 and only supports 2.4 GHz WiFi. That's fine for most homes, but it means the printer can't see or connect to 5 GHz networks. A few common things block pairing:
- WPA3-only security: the printer works with WPA2 or WPA2/WPA3 transitional, not pure WPA3 with PMF required. Mesh routers like Eero, Orbi, and Deco often default to WPA3.
- 2.4 GHz band disabled: some routers separate bands into different SSIDs or turn off 2.4 GHz entirely. The printer needs that band active.
- Your phone on 5 GHz: HP Smart pairs over 2.4 GHz initially, so if your phone is on the other band, the app can't discover the printer.
- Stuck setup mode: the printer leaves pairing mode after a few hours. You need to manually reset the network settings to re-enable it.
- HP Smart app cache: the app sometimes holds onto old printer info that blocks a fresh pairing.
- Hidden SSID: the 4255e can't auto-find a broadcast-disabled network unless you enter the exact name manually.
Check Your Router's Security Mode
If you're using a mesh system or a newer router, this is the most likely culprit. Open your router's app or admin page and look for the WiFi security setting. If it's set to WPA3 only, switch it to WPA2 or WPA2/WPA3 transitional (often called "compatibility mode" or "mixed mode"). Save the change and give the network 60 seconds to apply.
Now try pairing the DeskJet 4255e again. Once it's connected, you can usually switch the router back to WPA3 and the printer keeps the connection. But if you skip this step on a WPA3-only network, no other fix will work.
Reset the Network Settings Using the Buttons
The 4255e doesn't have a touchscreen, so you use the physical buttons. To reset the network settings and re-enter pairing mode, press and hold the WiFi button and Cancel button at the same time for about 5 seconds. The power light will blink and the printer resets its network config. Wait a minute for it to finish.
Now open HP Smart and tap Add Printer. The printer should appear within 30 seconds. If it doesn't, make sure your phone is on the same 2.4 GHz network first.
Make Sure Your Phone Is on 2.4 GHz
During initial setup, the DeskJet 4255e pairs over 2.4 GHz. If your router splits the bands into separate SSIDs (like "Home_2.4" and "Home_5"), and your phone is connected to the 5 GHz one, HP Smart can't see the printer. Switch your phone to the 2.4 GHz SSID temporarily, then try setup again.
This is especially common on TP-Link, Asus, and older Netgear routers that use separate network names for each band. After the printer joins, you can switch your phone back to 5 GHz for faster browsing.
Reinstall the HP Smart App
HP Smart caches printer info, and sometimes that cache gets corrupted. On your phone, delete the HP Smart app, restart the phone, then reinstall it from the App Store or Play Store. Sign in to your HP account and try adding the printer again.
A fresh install catches many invisible printers because it rebuilds the device list from scratch. This also fixes issues where the app shows "printer not found" even though the printer is on the network.
Double-Check Your WiFi Password
A single wrong character, a copy-paste with curly quotes from a notes app, or a transposed letter will silently fail. Type the password manually into HP Smart instead of pasting it. If your password has symbols like apostrophes or dashes, be extra careful to match exactly.
The printer's simple buttons don't show a password entry screen you enter the password on your phone or computer through HP Smart. So the app is your only interface for this step.
Enable 2.4 GHz on Your Router
Some routers, especially mesh systems, disable the 2.4 GHz band by default or use "band steering" that pushes clients to 5 GHz. Log into your router's admin page and check the wireless settings. Make sure the 2.4 GHz band is enabled and not set to "smart connect" or "auto" if that has caused issues. Also verify that the 2.4 GHz SSID is broadcasting (not hidden).
Once the band is active, try pairing again. The 4255e works with most home routers, but it absolutely needs a visible 2.4 GHz signal to connect.
Use HP Smart's Manual Setup
If the app can't auto-detect the printer, try the manual option. In HP Smart, tap Add Printer then choose Printer not found or Set up manually. Enter the printer's serial number (printed on the sticker on the back of the printer). The app will guide you through starting the printer's WiFi setup mode and entering your network credentials.
This bypasses automatic discovery and sometimes works when auto-detect fails. It's also the way to connect if you're trying to set up the printer after it has already been paired to another account.
Reset the Printer Completely
If nothing else has worked, you can do a full factory reset. On the 4255e, press the Settings button (wrench icon), then use the arrow buttons to navigate to Tools and select Restore Factory Defaults. Confirm when prompted. The printer will wipe everything including WiFi settings, HP Smart pairings, and any HP+ enrollment cache.
After the reset, the printer reboots into first-time setup mode. Open HP Smart fresh and walk through the initial setup as if the printer were brand new. This clears any deep configuration corruption that was blocking WiFi from the start.
