E7 means
The start/stop button, reverse/reinforcement stitch button
or the thread cutter button was pressed while no thread
cassette was installed
E3 means
The buttonhole or bar tack stitch was selected and the
start/stop button was pressed while the buttonhole lever
is raised.
(make sure buttonhole lever is in correct position)
If the start/stop button is pressed before the sewing machine is correctly set up or if an operation is performed
incorrectly, an error message appears in the stitch indicator. Follow the instructions that appear.
If you press (Stitch selection key) or do the operation correctly while the error message is displayed, the
message disappears.
download manual for this model at
http://welcome.solutions.brother.com/bsc/public/us/us/en/doc/manual_index.html?reg=us&c=us&lang=en&prod=hf_cs80eus&dlid=&flang=English&type2=-1
Hope this helps
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