My hot tub works for about 20 mins and clicks the GFI off. Then I reset the GFI and the spa comes on for about 7 mns and trips the GFI again. Is this my heater doing this?

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Easy way to test for the heater issue is to disconnect the heater from the board. Disconnect both leads from board and let the spa call for heat. There is also a chance the GFI breaker is bad however most times the heater fails and the breaker is doing its job.
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