My sewing machine is accelerating for an unknown reason My Toyota SFT39 (RS2000 3D Series, 2012) sewing machine has suddenly started accelerating at top speed no matter how gentle I am on the foot pedal. I opened up the foot pedal and can’t see anything wrong.

Can anyone help me troubleshoot?

It was sewing fine before this and has never gone this fast, unless of course I put firm downward pressure on the pedal.
This could be caused by a faulty capacitor in the machine.

See glossary item on this website:


  Electrical sewing machines have a component inside the motor of the machine called a capacitor.  This helps eliminate electrical noise from the motor and prevents the electrical noise from going back into your homes electrical grid.  When capacitors age they can split open and leak electrolytical fluid, which renders them faulty.  Once this happens, the motor of the machine will at times start running by itself.  The best course of action for when this happens is to take it in to get it looked at by a qualified sewing machine technician.


from: https://sewingmachinecentre.nz/pages/glossary#Running-On