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

Press the Resume button to continue using the printer without wireless functionality
2

If you need wireless printing turn off the printer wait 30 seconds and turn it back on
3

If Er/66 persists contact a qualified technician