Brother Printer Error Code 74 — What It Means & How to Fix It

What Does This Error Mean?

Brother error 74 means the printer's front or top cover is open or not properly latched. The printer has a safety sensor that detects whether covers are closed. Printing cannot proceed while any cover is open, since moving parts inside could cause injury or damage.

Affected Models

Brother HL-L2395DW
Brother HL-L3290CDW
Brother MFC-L2710DW
Brother MFC-L8900CDW
Brother DCP-L3510CDW

Common Causes

The front access cover is not fully latched shut after replacing a toner cartridge or clearing a paper jam
The toner access cover on the top or front was opened to check ink levels and not fully closed
Debris or a small object is lodged in the cover latch, preventing it from closing completely
The cover latch or hinge is damaged or broken, so the cover cannot physically stay closed
The cover sensor itself is dirty or has failed, reporting an open cover when the cover is actually closed

How to Fix It

Open the cover that is showing as open, then close it firmly until you hear a click.

On Brother laser printers, the main front cover often has two latch points. Press the full width of the cover to ensure both sides latch.
Check all other covers on the printer — top cover, rear cover, and manual feed slot cover. Any open cover will trigger this error.

Brother printers have multiple access panels. Open each one and close it firmly to confirm it is latched.
If you recently replaced a toner cartridge, open the front cover, remove the toner, reseat it firmly, and close the cover again.

A toner cartridge that is not fully seated can hold the cover slightly open. Make sure the toner clicks fully into its slot before closing the cover.
Check around the edges of the front cover for any small pieces of paper, torn scraps, or foreign objects that might be preventing the cover from closing flush.

Even a thin piece of paper trapped in the cover gap is enough to prevent the latch from engaging.
If the cover closes but the error persists, turn the printer off and back on. If still showing error 74 with all covers closed, the sensor may need cleaning or replacement.

Gently clean around the cover latch sensor (usually a small switch near the hinge) with a dry cotton swab.

When to Call a Professional

If the cover is physically closed but error 74 persists, the cover sensor may be faulty or misaligned. A technician can inspect the latch mechanism and sensor, clean or realign them, and replace the sensor if needed. This is typically a quick and inexpensive repair.

Frequently Asked Questions

Which cover causes Brother error 74?

Error 74 is usually triggered by the main front access cover — the large panel you open to replace toner cartridges. However, it can also be triggered by the rear cover, the top scanner lid (on MFC models), or any access panel with a safety sensor. Check all covers on the printer, not just the front one.

I just replaced the toner and now I get error 74. What did I do wrong?

The most likely cause is that the toner cartridge is not fully seated. Open the front cover, pull out the toner drum unit and cartridge, and reinsert the toner cartridge firmly until it clicks. Then reinsert the drum unit assembly and close the front cover. Error 74 should clear.

Can error 74 appear due to a broken cover latch?

Yes. If the plastic latch that holds the cover closed has cracked or broken, the cover will not stay shut and the sensor will keep reading it as open. Inspect the latch carefully — you may see a broken plastic tab. Brother replacement cover assemblies are available as spare parts, or a technician can fit one.