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More reasons a gfci pops.

Since it wasn't the heater, the remaining possiblities are few and rare.

First, look for water leaking onto the equipment.

Second, look behind the pcboard itself to see if connections are melted.

If not, then consider the gfci or power to spa is compromise. To check, disconnect the wires from the incoming control box from the gfci. Make sure the hots and neutral are not touching anything. Then turn on power. If the gfci still pops, either the gfci or the line is shorted. See an electrician.

If the gfci doesn't pop, the failure is likely the pcboard itself or the transformer. Both of these failures popping the gfci is rare.

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