Hello and welcome. Couple things to check first-
Tip the machine back and look underneath at the water pump, if it is wet or appears crusty/corroded, you probably have a shorted pump that took the machine control out along with it. Sometimes you can just replace the pump but on those models the board can become a casualty. Also look at the control itself and check for water in the pan area underneath it. Sometimes the mixing chamber thermistor leaks and it will short out the machine control. Whenever you replace the control, a new seal should be put on the thermistor. (easy and cheap insurance)
You might want to start with a fisher paykel gwl11 service manual:
http://fisherpaykelparts.net/index.php?categoryid=115&productid=17
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