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HP DeskJet 3755 Won't Connect to WiFi? 8 Fixes That Actually Work

Your HP DeskJet 3755 refuses to join your Wi-Fi \— the blue light keeps blinking, HP Smart can\’t find it, or it connects and then drops off a day later. In about 80% of cases the cause is one of three things: the wrong Wi-Fi band, the wrong router security mode, or a changing IP address. The 8 fixes below go from fastest to most permanent.

2.4GHz Setup 8 Step-by-Step Fixes Permanent Fix Included
wifi Jump to the Fixes

boltQuick Answer

The DeskJet 3755 only connects to 2.4GHz Wi-Fi \— put your phone on the 2.4GHz band during setup, hold Wireless + Cancel for 3 seconds until the blue light blinks, then add the printer in the HP Smart app with Bluetooth turned on. If it keeps dropping off the network, reserve a static IP in your router settings.

Why the 3755 Struggles With Wi-Fi (Read This First)

Understanding the cause saves you from repeating the same failed setup five times. Almost every 3755 Wi-Fi failure comes down to one of these three:

  • It\’s 2.4GHz-only. The 3755\’s wireless radio physically cannot see 5GHz networks. If your phone is on 5GHz during setup, HP Smart may pass the wrong network details to the printer.
  • Modern routers confuse it. WPA3-only security modes and band-steering (2.4GHz and 5GHz sharing one network name) are the top reasons setups fail on routers bought in the last few years.
  • It loses its address. The printer gets a temporary IP from the router. After a router restart it often gets a different one, then silently drops off \— showing as offline even though the blue light looks fine.

    • Every fix below targets one of these three causes.

Fixes 1–4: Get It Connected

1

Put your phone on the 2.4GHz band

This sounds trivial and fixes an enormous number of failed setups. HP Smart passes your phone\’s current network credentials to the printer \— phone on 5GHz means the printer gets 5GHz details it can never use.

  1. On your phone, open Wi-Fi settings. If you see two versions (e.g. HomeWiFi and HomeWiFi_5G), connect to the 2.4GHz one (usually the one without _5G).
  2. If there\’s only one network name, your router uses band-steering \— temporarily disable the 5GHz band in your router settings during setup (re-enable it after), or move far enough from the router that your phone drops to 2.4GHz on its own.
2

Check the signal strength

The 3755 has a small internal antenna. If the printer sits two rooms away behind a brick wall, no setup wizardry will hold the connection.

  • Move the printer within 10 meters (30 feet) of the router, with as few walls between as possible.
  • Keep it away from microwaves, baby monitors, and thick metal filing cabinets \— all murder 2.4GHz signals.
  • Print a Wireless Network Test Report (Wireless + Information together) and check signal strength \— below about -70 dBm is too weak. If the printer must live far away, a Wi-Fi extender near the printer beats another hour of troubleshooting.
3

Enter setup mode properly

The printer must be in setup mode (blinking blue wireless light) before HP Smart or WPS can configure it.

  1. Make sure the printer is powered on.
  2. Press and hold the Wireless and Cancel buttons together for 3 seconds, then release.
  3. The blue wireless light should start blinking \— the printer is now in Auto Wireless Connect setup mode.

If the light was already blinking, your earlier attempts failed for a different reason \— continue to Fix 4. If it\’s steady blue, the printer thinks it\’s connected (see Fix 7 for drop-off issues).

4

Add it with HP Smart \— Bluetooth ON

With the blue light blinking:

  1. Install the HP Smart app from 123.hp.com on your phone or computer.
  2. Turn Bluetooth ON on your phone \— HP Smart uses Bluetooth to discover the printer during setup. This is the step most people miss.
  3. Open HP Smart, tap the + icon, select your DeskJet 3755, choose your 2.4GHz Wi-Fi network, and enter the password carefully.
  4. Wait for the wireless light to turn steady blue \— that\’s your confirmation.

Bluetooth is only needed for discovery \— you can turn it off afterward. If HP Smart can\’t see the printer at all, re-check the blinking light (Fix 3) and the 2.4GHz band (Fix 1).

Fixes 5–8: When Setup Keeps Failing

5

Try the WPS push-button method instead

If HP Smart keeps failing, bypass the app entirely:

  1. Put the printer in setup mode (Fix 3 \— blinking blue light).
  2. Press and hold the Wireless button on the printer for at least 3 seconds.
  3. Within 2 minutes, press the WPS button on your router (usually on the back or side).
  4. Wait up to 2 minutes \— the printer\’s wireless light turns steady blue when connected.

No passwords to type, no app needed. The catch: both devices must support WPS, and some ISP-provided routers have it disabled \— check your router settings if the button does nothing.

6

Fix the WPA3 / band-steering router problem

If setup starts but fails at the password step, or the printer connects and immediately drops, your router\’s security settings are the likely culprit:

  1. Log into your router (192.168.1.1 or 192.168.0.1 \— address and login are on the router\’s sticker).
  2. Change wireless security from WPA3-only to WPA2/WPA3 mixed (or WPA2-Personal). The 3755\’s older radio cannot complete a WPA3-only handshake.
  3. If your router merges 2.4GHz and 5GHz under one name (\“Smart Connect\”), disable it or give the 2.4GHz band its own name (e.g. Home_2G).
  4. Save, restart the router, and run printer setup again from Fix 3.

This single change resolves the majority of \“worked fine on my old router\” cases.

7

The permanent fix: static IP reservation

For printers that connect fine but drop off every few days or after every router restart: the router gives the printer a new IP address each time, and your devices lose track of it.

  1. Print a Wireless Network Test Report (Wireless + Information together) and note the printer\’s IP and MAC addresses.
  2. In your router settings, find DHCP Reservation / Address Reservation (usually under LAN settings).
  3. Bind the printer\’s MAC address to a fixed IP (e.g. 192.168.1.50).
  4. Save and restart the printer.

After this the printer always gets the same address and your computers always find it. This is the fix for every \“it worked yesterday\” complaint.

8

Reset network settings and start over

When nothing else works, wipe the printer\’s network memory:

  1. Press and hold Wireless + Cancel together for 3 seconds to reset network settings and re-enter setup mode (blinking blue light).
  2. On your computer/phone, forget the printer: remove it from HP Smart and from your system\’s printer list.
  3. Start fresh from Fix 1 \— phone on 2.4GHz, HP Smart with Bluetooth on.

A clean slate eliminates corrupted network profiles, which are more common than people think after multiple failed setup attempts.

Frequently Asked Questions

Why won't my HP DeskJet 3755 connect to WiFi?expand_more
The three most common reasons: your phone was on 5GHz during setup (the 3755 is 2.4GHz-only), the printer wasn't in setup mode (hold Wireless + Cancel 3 seconds for the blinking blue light), or Bluetooth was off so HP Smart couldn't discover it. Fixes 1, 3, and 4 above cover all three.
Does the DeskJet 3755 support 5GHz WiFi?expand_more
No. The DeskJet 3755 only supports 2.4GHz 802.11b/g/n networks. It cannot see or join 5GHz networks at all. During setup, make sure your phone is connected to the 2.4GHz band so HP Smart passes the correct network to the printer.
How do I put my DeskJet 3755 in WiFi setup mode?expand_more
Press and hold the Wireless and Cancel buttons together for 3 seconds. The blue wireless light will start blinking, which means the printer is in setup mode and ready to receive Wi-Fi details from HP Smart or WPS.
Why does my 3755 keep disconnecting from WiFi every few days?expand_more
Your router is almost certainly assigning the printer a new IP address on each restart (DHCP), and your devices lose track of it. Set a DHCP reservation (static IP) for the printer's MAC address in your router settings — Fix 7 above walks through it, and it permanently solves the problem.
HP Smart can't find my DeskJet 3755 — what now?expand_more
Check three things: (1) the printer's wireless light is blinking blue (setup mode), (2) Bluetooth is ON on your phone, (3) your phone is on the 2.4GHz band, not 5GHz. If all three are true, try the WPS push-button method (Fix 5) instead of the app.
My router only has WPA3 — will the 3755 work?expand_more
Not on WPA3-only mode. Change your router's wireless security to WPA2/WPA3 mixed mode (or WPA2-Personal). The 3755's wireless radio predates WPA3 and cannot complete the handshake on WPA3-only networks.

When to Replace the Cartridge

Wi-Fi problems and ink problems love to arrive together on older printers. Replace your HP 65 / 65XL cartridges (the 3755\’s cartridge family) if prints are faded or streaky after cleaning, if the printer shows a cartridge error alongside connection issues, or if a cartridge has been installed for more than 6 months.

Practical tip: run a test print right after fixing Wi-Fi \— if the network is fine but the page comes out blank, you were chasing the wrong problem all along. See the genuine replacement options below.

Replacement Ink Cartridges

The HP DeskJet 3755 printer uses genuine HP 65 / HP 65XL ink cartridges. Select your cartridge below to purchase replacement cartridges on Amazon:

shopping_cart Buy HP 65 on Amazon shopping_cart Buy HP 65XL on Amazon