Originally Posted by
maminstl
Mine is supposed to tell me, but isn't at the moment, so to the shop it will go. Yesterday, I did a whole row of chain sewed squares - at least 20 of them, before I realized I had an empty bobbin. I hate when that happens!
Check to see if there is a tiny light on the inside of the door to the bobbin access area. Mine looks like a tiny glass bubble, and the way the low bobbin indicator works, is that light shines onto the clear bobbin, hitting thread. When the thread empties out most of the way, then beam of light can then shine through the clear bobbin onto a sensor behind the bobbin, which sets the low bobbin alarm off. If a thin film of lint covers that tiny bubble light, then it can't shine it's beam of light, and the low bobbin alert won't work. Try wiping it off with your finger, fabric, or a Q-tip regularly and see if that saves you a trip to the repair shop. Certain threads are lintier than others and cause mine not to work. Other threads are fine.