Buy a new foot pedal for it, probably one of the electrical components inside the foot has failed.
There are Kenmore footcontrols for sale on
www.sewingpartsonline.com. You could email them to check its right for your model if it isn't listed.
Obviously I'm assuming that you are in USA with 110 Voltage and that is what your machine is. If not and your country is 220V, you would need to source it from a reseller in your own country or another with the same voltage.
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