machine will continue to sew before foot peddle is plugged in?

Hello Please can anyone help me with my Singer Concerto 2 (9217) which has an air controlled foot peddle, The machine runs as soon as it's powered up,I looked inside the foot peddle to take the suppressor out and it only has a rubber bulb no electric parts in it. Thank you for any help
Regards Marian
Marian, March 2009


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