because the knob only tells the circuit board what to do it is only  a selector     the fact that it is clicking means the machine has sensed a fault with itself.        to rectify ramove rear panel access circuit board note/photograph all wires & connections disconnect pcb all wires.           you will see a small plug in microchip  (an eeprom)  pull it out pcb and short all pins together on something metal        reassemble &  try again      if fault re occurs then something else has been sensed by pcb     then check for pump out     motor action     heating    and  filling ok       good luck hope it helps
                 kev      kinspectorgadget@tiscali.co.uk
                
 October 2005