Unplug the Fisher & Paykel GWL15 washer to avoid serious electrical injury while changing the drain pump. Find the hot and cold water supply valves on the wall behind the appliance.
Turn the valves clockwise as far as they go to shut off the water supply to the appliance.
Pull the washer out 2 to 3 feet and tip it back to rest against the wall. Access the drain pump from underneath the machine.
Locate the pump in the front, right-hand corner of the washer cabinet.
Pry up the plastic retaining tub on the drain pump mounting bracket, using a flat-head screwdriver. Twist the pump counterclockwise and pull it out of the bottom of the washer cabinet.
Coat the seal diaphragm on the top of the replacement drain pump with a very light layer of bearing lubricant. Hold the pump up to the connector on the base of the tub and twist clockwise to lock the component into place; the plastic retaining tab automatically engages.
Slowly lower the washer to the floor. Plug the power cord into a grounded electrical outlet, and open the hot and cold water supply valves before operating the machine.