Drain pump will normally run for approx. 60 secs then stop. Have you waited this long? If it keeps running it can be because the flood switch has activated. Take off the lower panel under the door. Look inside to see if there is any water on tray. If so then dry it off and pump will stop running but you will need to find why it leaked. The flood switch is a microswitch on a brown plastic holder with a piece of polystyrene under it. The polystyrene float will rise up on the water and trigger the microswitch. The switch itself may be stuck on check that as well.
Lincoln Appliance NZ, April 2012