The number one cause for GFCI trips is a shorted heating element.
The quickest way to confirm if this is the case is to disconnect both leads from the circuit board supplying power to the heating element. Power up the system again. If the GFCI does not trip, the heating element is shorted and needs to be replaced.
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If the GFCI still trips with the heating element disconnected, then start unplugging one thing at a time from the control box, unplugging the main heat pump last. Turn the power back on each time something is unplugged. If the GFCI holds, then you have found the cause of the GFCI tripping. It will need to be replaced. If you have everything unplugged (including the main pump) and it still trips, then there may be an issue with the transformer that is soldered or plugged into the circuit board. If the transformer plugs into the board it can be easily replaced. If the transformer is soldered onto the board, the board will need to be replaced.
Click for more information regarding the transformer and how to test it.
NOTE: If this is a new installation and your GFCI is tripping, make sure that the GFCI was installed correctly. Licensed electricians have been known to install GFCI breakers incorrectly.
Click to see GFCI load center wiring examples.
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