Brother Printer Error Code C1 — What It Means & How to Fix It

What Does This Error Mean?

Brother error C1 means the printer's purge unit or flushing box is full. The purge unit collects waste ink from cleaning cycles and over time it fills up. The printer stops as a safety measure to prevent ink from overflowing onto internal components. Service is needed to replace or clean the purge unit.

Affected Models

Brother MFC-J995DW
Brother MFC-J1010DW
Brother MFC-J5845DW
Brother MFC-J5945DW
Brother MFC-J6945DW

Common Causes

The purge unit or flushing box has reached its maximum ink capacity after extended use
Excessive print head cleaning cycles were run over the printer's lifetime, filling the purge unit faster than normal
The printer has been used heavily for high-volume printing over many years
The purge unit was never replaced or cleaned during the printer's service history
The printer's internal usage counter reached the threshold set by Brother for purge unit service

How to Fix It

Check whether your Brother printer has a user-replaceable purge unit. Visit brother.com/support, enter your model number, and search for purge unit or flushing box replacement.

Some Brother models allow users to replace the purge unit themselves. Others require a service center visit.
If a user-replaceable purge unit is available for your model, order the correct part from Brother or an authorized parts supplier.

Use the exact part number specified for your model. Incorrect parts may not fit or may not reset the error.
Follow Brother's instructions to replace the purge unit. This typically involves opening the printer's front cover, removing the old unit, installing the new one, and confirming the replacement in the printer's menu.

After installing the new purge unit, the printer will prompt you to confirm the replacement so it can reset the internal counter.
If the purge unit is not user-replaceable, contact Brother Support at brother.com/support or locate an authorized service center.

Brother's website has a service locator where you can find authorized repair centers in your area.
Consider whether repair is cost-effective. Compare the service cost to the price of a new replacement printer of similar capability.

For older or lower-value printers, the repair cost may exceed the printer's worth. A new printer is often the more practical choice.

When to Call a Professional

Error C1 cannot be permanently fixed by the user without physical service. The purge unit needs to be replaced or cleaned by someone with the correct parts and tools. Brother authorized service centers can perform this service. Alternatively, if your Brother model has a user-replaceable purge unit, Brother's support page has instructions. Contact Brother Support at brother.com/support or visit a local service center.

Frequently Asked Questions

What is a purge unit and why does it fill up?

The purge unit (also called a flushing box or maintenance box) is a sponge or container inside the printer that collects waste ink. Every time the printer runs a cleaning cycle — to clear clogged nozzles or maintain print quality — ink is flushed through the print head into the purge unit. Over thousands of cycles and years of use, the unit gradually fills with this waste ink until it is full.

Can I use a software tool to reset the C1 error without replacing the purge unit?

Yes, there are third-party software tools that can reset Brother's waste ink counter. However, this only resets the counter — the purge unit is still physically full. Using the printer after a counter reset without replacing the unit risks ink overflow, which can permanently damage the printer. A counter reset should only be used as a very short-term emergency measure.

How long does it take for a Brother printer to reach error C1?

This varies greatly depending on how many cleaning cycles are run. A printer used primarily for text documents with minimal manual cleaning cycles can last many years before hitting C1. A printer used for heavy photo printing or frequent cleaning may fill the purge unit much faster. Avoiding unnecessary manual cleaning cycles significantly extends the purge unit's lifespan.