I have an Elna 7200 Quilter's Dream which is probably very similar to your 6003. I haven't heard of this problem, so I went to my manual. The key right above the start/stop key is the reverse key. The manual says that if the foot control is disconnected, the machine will sew in reverse until you release the key. Any help? You can read a lot of manuals on-line these days. Just search for Elna 6003 Quilter's Dream Manual. You might get lucky and it's available.