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You reset the unit by cycling the power off (turn the breaker in the electrical panel off) for a minute or so then back on again.
It sounds like a problem with the board. It's unlikely you'd have another similar problem so soon with a new element. You might want to test the lower element before replacing the board just in case. Turn the power off remove the leads to the element then test for continuity across the 2 terminals (yo should have continuity) and from each terminal (separately) to the bare tank (should not have continuity). If the element checks out then the board is the likely culprit