HP Deskjet 3755 Won’t Connect To Wi-Fi? | Quick Fixes

If your compact DeskJet won’t join wireless, don’t panic. This model is small, handy, and picky about networks. It speaks only 2.4 GHz, needs the right setup mode, and doesn’t like hidden or enterprise sign-in portals. The steps below walk you from fastest checks to deeper fixes—so you can print again without tearing your hair out.

Quick Causes And Fixes

Start with the easy stuff. Match your symptom to a likely cause and a fast action. This overview table sits near the top so you can act right away.

Symptom	Likely Cause	Fast Fix
Blue wireless light stays off	Wireless disabled or not in setup mode	Hold Wireless + Cancel 3–5 sec to enter setup; light blinks
Printer found, can’t finish join	Router on 5 GHz-only SSID	Pick a 2.4 GHz SSID; separate names for 2.4/5 help
HP Smart can’t see the device	Phone/PC on different band or AP isolation	Connect your device to the same 2.4 GHz Wi-Fi; disable isolation
Random drops after a day	Band-steering or busy channel	Give 2.4 GHz its own SSID; use channel 1, 6, or 11; set WPA2
WPS fails	WPS off on router or timed out	Enable WPS, press router’s WPS within 2 minutes, retry
Password rejected	Special characters or typo	Re-enter slowly; test same SSID with another phone
Works at home, not at dorm/hotel	Captive portal or enterprise auth	Use Wi-Fi Direct or a travel router that joins the portal

Fix A DeskJet 3755 Not Joining Wi-Fi — Step-By-Step

These steps assume a home router with WPA2 and a visible 2.4 GHz SSID. Follow them in order; each one removes another roadblock.

1) Put The Printer In Wireless Setup Mode

Power the unit on. Press and hold the Wireless button and the Cancel button together for about three to five seconds. Release when the blue light starts blinking. That blinking means it’s ready to be claimed by the app.

2) Use The HP Smart App To Reconnect

Install HP Smart on your phone or computer. Open it, tap “Add Printer,” and pick the blinking DeskJet from the list. When prompted, choose your 2.4 GHz network and type the password. Wait until the blue light turns solid. Print the app’s test page to confirm.

3) Keep Your Phone/PC On The Same Band

During setup, connect your phone or computer to the same 2.4 GHz SSID you intend for the printer. Some routers steer devices to 5 GHz by default; switch to the 2.4 GHz SSID before you start.

4) Try WPS Push (Optional)

If your router supports WPS, press and hold the printer’s Wireless button for a few seconds to start WPS mode (the light blinks quickly). Within two minutes, press the router’s WPS button. The blue light turns solid when the join completes. If it fails, return to the app-based method.

Make Your Router A Friendly Target

The radio in this model is basic and happiest with classic 2.4 GHz settings. A few small tweaks can stabilize the link.

Use A Dedicated 2.4 GHz SSID

If your gateway broadcasts a single name for both bands, create separate SSIDs like “Home-2G” and “Home-5G.” Connect the printer to the 2.4 GHz one. Leave your phone on 5 GHz after setup if you prefer; they’ll still talk across the LAN.

Pick Clear Channels

Set 2.4 GHz to channel 1, 6, or 11. Auto works on many routers; if neighbors are heavy on one channel, try another. Keep channel width at 20 MHz for range and fewer retries.

Security And Compatibility

Use WPA2-Personal (AES). Avoid WPA3-only or enterprise modes. Disable MAC filtering during testing. Keep “AP isolation” off so devices can see each other.

Mind The Range

Place the printer within one or two rooms of the router. Large appliances and concrete walls reduce 2.4 GHz range. If signal is weak, try moving the router a bit higher or add a simple extender for the 2.4 GHz network.

When The Network Changed (New Router Or New ISP Box)

Any time the SSID or password changes, the printer won’t magically follow. Reset its wireless, then run setup again from the app.

Reset Wireless Settings Cleanly

On the panel, press and hold Wireless + Cancel for three to five seconds until the power light blinks. That clears the stored network profile and re-opens setup mode. Launch HP Smart and re-add the device.

Turn Off Hidden SSIDs During Setup

If you hide your network name, unhide it until the printer joins. Many small IoT radios won’t connect to hidden networks reliably. You can hide it again after onboarding.

Separate The Bands If Band-Steering Gets In The Way

Routers that merge both bands under one name can confuse older radios. Give 2.4 GHz a distinct name and reconnect the printer to that name.

Deeper Diagnostics When It Still Won’t Join

At this point, most setups are done. If yours still resists, pull these levers.

Print A Network Report

From the panel, press the Information button (i) and the Wireless button together to print a basic report. Look for signal strength, channel, and any error codes. Weak RSSI or “Authentication failed” points straight to placement or password issues.

Update Firmware Through The App

Open HP Smart, select your device, and check for an update. Bug fixes often improve wireless stability on entry-level radios. Let the update finish, then power-cycle the printer and router.

Use Wi-Fi Direct As A Stopgap

Need to print right now? Enable Wi-Fi Direct on the printer, connect your phone to the printer’s broadcasted name, and print via HP Smart. Throughput is slower than normal LAN printing, but it gets the job done while you sort the router.

Router Settings That Tend To Work

Here’s a compact cheat-sheet you can follow while logged in to your gateway’s admin page. Keep changes on the 2.4 GHz band only; don’t touch your 5 GHz performance profile.

Setting	Recommended Value	Where To Change
Band	2.4 GHz only for the printer	Wireless › Basic/Radio
Channel	1, 6, or 11; 20 MHz width	Wireless › Advanced
Security	WPA2-Personal (AES)	Wireless › Security
SSID Broadcast	Visible during setup	Wireless › Basic/SSID
Band Steering/Smart Connect	Off or separate SSIDs	Wireless › Advanced/Smart
AP Isolation	Off	Wireless › Advanced
WPS	On temporarily if using WPS	Wireless › WPS

Common Scenarios And Exact Fixes

Switched Internet Providers And Got A New Gateway

Gateways from ISPs often enable band-steering by default. Split the bands into two names, reconnect the printer to the 2.4 GHz name, and leave your phones on 5 GHz.

Moved The Printer To A Far Room

2.4 GHz reaches farther than 5 GHz, yet it still hates concrete and metal. Try a closer spot or add a basic extender that repeats only the 2.4 GHz network name the printer uses.

Dorm, Hotel, Or Office Network

These networks often require a web login per device, which printers can’t complete. Use Wi-Fi Direct for ad-hoc printing, or bring a small travel router that joins the captive portal once and creates a private 2.4 GHz LAN for your devices.

WPS Light Keeps Timing Out

WPS must be enabled in the router and pressed within two minutes of starting WPS on the printer. If it still fails, go back to HP Smart with the normal password-entry method.

Light Codes And What They Mean

The single blue light tells most of the story:

• Off: Radio off or not configured—enter setup mode.
• Blinking slowly: Ready for setup or trying to join.
• Blinking quickly: WPS active.
• Solid: Connected.

When the light won’t go solid, reset wireless, use the app, and point to a clean 2.4 GHz SSID.

Best Practices That Keep It Stable

• Reserve a DHCP address for the printer so it doesn’t hop around after reboots.
• Keep the router firmware current; consumer gateways ship frequent fixes for 2.4 GHz radios.
• Avoid packed USB 3.0 hubs near the unit; they can raise noise in the 2.4 GHz band.
• Don’t bury the printer inside cabinets; give the antenna some air.

When To Call It And Try A Different Path

If you’ve reset wireless, used HP Smart, split the bands, and the blue light still blinks for more than five minutes, print via Wi-Fi Direct as a temporary path and schedule time to revisit the router. On some mesh systems, creating a “2.4 GHz-only” IoT SSID for legacy gadgets solves the last 1% of cases.

Helpful References And Safe Links

You can connect through the official app and standard Wi-Fi join flow documented by HP. See the Wi-Fi setup steps and the note that this series uses only 2.4 GHz on HP’s product page. If you need to re-enter setup mode, HP’s guide to restoring Wi-Fi setup mode shows the same button combo you used above.

Final Checkpoints Before You Call Support

• 2.4 GHz SSID visible, WPA2-AES, channel 1/6/11.
• Phone/PC on the same 2.4 GHz band during setup.
• Wireless + Cancel held until the light blinks, then add in HP Smart.
• Firmware updated in the app; test a print.

Tick those off and this tiny printer usually behaves. When it does, leave the network as you set it; stability beats speed on this radio.