When rethreading I pulled out the bobbin case to make sure it was seated correctly and found a kind of 'v' shaped piece of wire (about the width of a paper clip I guess) sitting loose under the bobbin case. This, of course, lead to the thread jamming so I had to clear that. So, I was sewing along and heard a thump.kind of sounded like a louder version of what you hear when the needle hits a pin.but I wasn't using pins. You should replace it first because that also can confuse the sensor causing that error. Free repair help Household Appliances, Sewing Machines - lervia sewing machine. 3rd: Will sew 2-3 stitches, then packs up again just like in 1st instance above.

Reinstalled bobbin, etc., per manual, rethreaded. 2d: In order to check threading had to manually PULL bobbin case toward me or it was UNDER needle plate. When push-button (NOT pedal) is used, gives error E6, consistent with motor noise.

Borrowed Brother XR7700 Sewing Machine 1st: Sewed one inch OK moved fabric and it stopped sewing, motor made thudding noise.