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I believe this machine can operate without the foot pedal attached. Disconnect the foot pedal and try using Start/Stop button. If same symptoms with pedal detached then likely problem is speed control module inside machine.
First things I would think is a foot control problem or motor carbon brushes. I don't know if yours has carbon brushes, but if so, most likely they are worn down so they do not make proper contact.
most sewing machines are controlled by a foot peddle the harder you press the faster it goes but if this one is electronic it should have another method of slowing it down
what type of machine do you have. I have two that I operate with buttons and it has a little slide button to speed or slow down I don't know why it should run to fast with a foot pedal because you control the speed with your foot you may want to check to see if there is any trash that has gotten in the foot and somehow not allowing the foot to come back up
It sounds as though the foot pedal is the problem. Maybe a shorted out wire in the actuator (rheostat). When your foot is off the pedal there should be no power running through it. If it has a short then it "thinks" the pedal is partially depressed to the slow position so runs at that speed. If the pedal can be removed/unplugged from the machine, do this and see if the machine stops running.
it could be the motor or the power cord or the foot pedal, check to make sure the power cord and the foot pedal are connected correctly to the machine.if they are then the machine and power cord and foot pedal need to be checked
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