The E6 error code on a Brother embroidery machine typically indicates a problem with the machine’s thread cutter. This error can occur if the thread cutter is malfunctioning, blocked or not moving properly.

To fix the E6 error, you can try the following steps:

1. Power off the machine and unplug it from the power source.
2. Check the thread cutter mechanism to see if there is any thread, debris, or obstructions blocking it. If so, carefully remove any debris.
3. Check the cutter blade to make sure it is properly installed and not damaged. If the blade is damaged, it may need to be replaced.
4. Check the cutter motor to make sure it is functioning properly.
5. Turn the machine back on and try the thread cutter again to see if the error is resolved.

Possible causes for the E6 error include a malfunctioning thread cutter motor, a damaged cutter blade, or debris obstructing the thread cutter mechanism.

If you have followed these steps and the error persists, it is recommended that you take the machine to a Brother authorized service center for further diagnosis and repairs. They will have the expertise and equipment necessary to diagnose and fix the issue.