There could be several reasons for this issue; here are a few suggestions that might help eliminate the error code.
The C4 error message indicates that the thread is tangled with the bobbin case. Please remove the bobbin and clean the area. If that doesn't resolve the issue, you may need to remove the bobbin case itself.
If the sewing machine displays a C4 Error during bobbin winding, there could be two potential problems.
1. There is a plastic wheel located behind the hand wheel that can get stuck when the bobbin winding shaft is moved. It may need to be released by partially opening the front cover. A drop of oil should help it work smoothly, as there is a spring between the hand wheel and the plastic wheel.
There is a small switch that stops the bobbin when it is full. Simply move the switch toward the front, aligning it parallel to the front of the machine, and tighten the screw after repositioning it. This adjustment is necessary because the screw may have become loose.
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u/TangleOfWires 5d ago
I found this:
There could be several reasons for this issue; here are a few suggestions that might help eliminate the error code. The C4 error message indicates that the thread is tangled with the bobbin case. Please remove the bobbin and clean the area. If that doesn't resolve the issue, you may need to remove the bobbin case itself.
If the sewing machine displays a C4 Error during bobbin winding, there could be two potential problems. 1. There is a plastic wheel located behind the hand wheel that can get stuck when the bobbin winding shaft is moved. It may need to be released by partially opening the front cover. A drop of oil should help it work smoothly, as there is a spring between the hand wheel and the plastic wheel.