Innov-is 550SE/ 550 FAQs & Troubleshooting Innov-is 550SE/ 550 Not your product? Sort by Updated Date Popularity 2 Results 1. 23/10/2015 Why does the lower thread keep breaking? 2. 09/05/2006 When thread gets tangled. More FAQs (English only) Sewing (Character Decorative Stitches) FAQs & Troubleshooting