ErrorCodeDoctor
Brother · Printer (Laser)

Brother Printer (Laser) Self-Diagnostic error code

Difficulty: Medium · Cost: $0–$200 · Duration: 15m

The Self-Diagnostic message on your Brother laser printer means either the fuser unit temperature did not reach the required level within the specified time or the fuser unit is too hot. Press and hold the Power button to turn the machine off, wait a few seconds, then turn it back on. Leave the machine idle for 15 minutes with the power on. If you have faxes stored in memory transfer them before turning off.

Common causes

  • The fuser unit temperature did not rise to the required level within the specified startup time
  • The fuser unit has overheated

How to fix it

  1. 1

    If you have faxes in memory transfer them to another fax machine or PC before turning off

  2. 2

    Press and hold the Power button to turn the machine off completely

  3. 3

    Wait a few seconds

  4. 4

    Turn the machine back on

  5. 5

    Leave the machine idle with the power on for 15 minutes

  6. 6

    If Self-Diagnostic persists contact a qualified technician

Related Brother Printer (Laser) error codes

1

2-sided Disabled / 2-sided Disable

The back cover or 2-sided tray is not properly closed or installed

easy
2

Access Denied

The function you are trying to use is restricted by Secure Function Lock

medium
3

Cartridge Error / Put the Toner Cartridge back in

The toner cartridge is not installed correctly in the drum unit

easy
4

Comm. Error

A poor telephone line caused a fax communication error

easy

Self-Diagnostic error — frequently asked questions

What does the Self-Diagnostic error mean on a Brother printer (laser)?

The fuser unit temperature is not reaching the correct level — a fuser fault was detected

What causes the Self-Diagnostic error?

The Self-Diagnostic error is usually caused by: The fuser unit temperature did not rise to the required level within the specified startup time; The fuser unit has overheated.

Can I fix the Self-Diagnostic error myself?

It's possible for a moderately handy person, but budget 15m and expect some disassembly.

How much does it cost to fix the Self-Diagnostic error?

Fixing the Self-Diagnostic error on a Brother printer (laser) typically costs $0–$200, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my printer (laser) with the Self-Diagnostic error?

In most cases yes, but it's best to address the Self-Diagnostic error soon — see the fix steps below to resolve it.