The F2 error on a Brother embroidery machine indicates a problem with the frame moving motor. Here are some steps you can take to fix the issue:

1. Turn off the machine and unplug it from the power source. Wait for a few minutes before plugging it back in and turning it on again. This can reset the machine and clear any temporary glitches.
2. Check the embroidery frame. Make sure it is inserted correctly and securely.
3. Check the embroidery arm. Make sure it is not obstructed or jammed.
4. Check the embroidery design. Make sure the design is not too large or too dense for the machine to handle.
5. Check the motor. Make sure the motor is functioning properly and is not damaged or worn.
6. Check the machine for any signs of damage or wear. If any parts appear to be damaged or worn, they may need to be replaced.

If these steps do not solve the F2 error, it may indicate a more serious problem with the frame moving motor or the machine’s internal components. In this case, it is best to contact a qualified technician or the manufacturer for assistance.