ErrorCodeDoctor
HP · Printer (LaserJet)

HP Printer (LaserJet) Er/66 error code

Difficulty: Medium · Cost: $0–$150 · Duration: 2m

The Er/66 error means your HP LaserJet printer cannot detect the Wi-Fi hardware module. Press Resume to continue using the printer without Wi-Fi — you can still print via USB while this error is present. If you need wireless printing turn the printer off wait 30 seconds and turn it back on. If the error persists contact a qualified technician.

Common causes

  • Wi-Fi hardware module is not detected — possible hardware fault
  • Temporary firmware issue preventing Wi-Fi hardware detection

How to fix it

  1. 1

    Press the Resume button to continue using the printer without wireless functionality

  2. 2

    If you need wireless printing turn off the printer wait 30 seconds and turn it back on

  3. 3

    If Er/66 persists contact a qualified technician

Related HP Printer (LaserJet) error codes

1

Er/01

The input tray is empty — no paper loaded

easy
2

Er/02

The cartridge access door is open

easy
3

Er/03

The printer failed to pick a sheet of paper from the tray

easy
4

Er/04 / Er/05 / Er/06

A paper jam was detected inside the printer

easy

Er/66 error — frequently asked questions

What does the Er/66 error mean on a HP printer (laserjet)?

The Wi-Fi hardware is not detected

What causes the Er/66 error?

The Er/66 error is usually caused by: Wi-Fi hardware module is not detected — possible hardware fault; Temporary firmware issue preventing Wi-Fi hardware detection.

Can I fix the Er/66 error myself?

It's possible for a moderately handy person, but budget 2m and expect some disassembly.

How much does it cost to fix the Er/66 error?

Fixing the Er/66 error on a HP printer (laserjet) typically costs $0–$150, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my printer (laserjet) with the Er/66 error?

In most cases yes, but it's best to address the Er/66 error soon — see the fix steps below to resolve it.