The potentiometer has probably failed... You can TRY putting a bit of CRC226 which is available at HomeDepot in the electrical dept. into the slot and working it. Use only that product as there are other CRC products there. About $2.70 in a small blue aerosol can. Use the spout, spray into the center and move handle. repeat a few times. If that doesn't' work, replace the pot.
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