examined Kettle unit. potentiometer meter not moving smoothly. will order part and return, will need to solder wires onto potentiometer before install. 10/21/19 returned with potentiometer. knob screws stripped. will need to break knob to remove old potentiometer. will order new knob before replacing potentiometer. unit working properly. 10/24/19 Removed and replaced potentiometer and knob with a new. had to break old knob to remove. tested. boiled water. good to go.