Pressing the reset button again and again treats the symptom. The trip is a safety device doing its job.
Safety first
Never remove an access panel or touch wiring with the power on. If the breaker for the water heater keeps tripping, leave it off and call a licensed electrician or plumber.
What the reset button is
It is the high-limit or energy cutoff (ECO) switch. It cuts power to the elements when the water gets abnormally hot, preventing scalding and overpressure.
What to do
A.O. Smith says a qualified service agent should determine the reason for the trip before resetting. If it trips once after a power event, a single reset may be reasonable; if it trips again, stop and call for service.
General information, not professional or legal advice; follow your manufacturer's manual, and your installer and local permit office have the final word. Sources:A.O. Smith residential electric water heater manual (185762); Bradford White installation & operating manual.
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