Disetronic Medical Systems Inc. and the FDA notified healthcare professionals about a defect in the “up” and/or “down” buttons of some ACCU-CHEK Spirit insulin pumps. This failure may present as an intermittent or complete loss of function of the “up” and/or “down” buttons. If the buttons do not function, users may not be able to change any programmed setting on the pump. If this failure occurs, the pump may not respond with a vibration or acoustic confirmation signal to a button press and the display will remain unchanged.