Pool and Spa
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I've done the same thing, and if you get ANY water in the board at all, it will keep tripping the breaker until it dries out. How long has passed since things got wet down there. If it been less than 48 hours, you may need to hit it with a hair dryer. The heating element is the most common cause of a breaker trip. So you could try disconnecting the two connections to the heater , then with those disconnected, try the breaker so we can rule out the heater anyway.