Hi.
F-03 means that there is an heating system problem.
The heating system consists in the heater element and in a thermistor, located near to the element. The parts are located behind the panel at the back of the washer. Both element and thermostat can be tested using a mulitimeter to check if they have continuity (Ohms reading across part's terminals returns infinity).
Here a movie showing how to reach the heating element:
You-Tube video "rI6yItFjzQs&feature=player_embedded#!" placeholder
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