How to Fix Brother Sewing Machine Error Code F4

Q:  What does F4 error message mean?
Ans: Foot controller disconnected
Q:  How to fix F4 error message?
Ans: Plug in the foot controller jack if it's disconnected. If the foot controller jack appears damaged, replace it. Replace the foot controller if it's defective. Replace the main PCB assembly if the foot controller is connected and working properly.
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