Then cut away the fabric to expose the bobbin area. Stop what you are doing and raise your foot.
This happens when the thread fails to loop properly around the bobbin when the machine is operating. One of the common problems in this area of your Elna sewing machine is that too much thread is piling up in the bobbin area. Check those issues and take care of them if they are the problem. The sewing machine doesn’t sew - you may have a power cord, foot pedal problem, loose or frayed wires or you failed to turn the machine on or put the needle in wrong. Thread breaking - this usually takes place when your tension is too tight. Stitch problems - these come about when your bobbin or machine is not threaded correctly, your tension is off or your needle is bent or broken or the wrong one Re-insert both to stop this from taking place. Noise from your sewing machine - usually if you have cleaned your machine it means that your bobbin or bobbin case is loose. Mis threading - this happens to the best of sewers and at the worst of times. Lubrication - if you do not oil the sewing machine regularly you will run into bigger problems later on. It is dirty - simply do regular cleaning to avoid this problem interfering with your sewing.