There is a small spring and sensor inside the head frame of the machine that sometimes gets dislodged when the thread is pulled backward. A visit to your Bernina store technician will fix this issue. In my experience, this is the most common explanation of the alert you are seeing on the aurora model. If that is not the case, the technician can further investigate the cause.
Embroidery machine for 440E
when embroidering a design my machine acts like I have a broken thread every few seconds. Is this a fixable problem in the machine or is this a problem with the design. I just had the sewing machine serviced but have not had the embroidery machine serviced.
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wow I am having that problem also! and trying to find a solution