On an electric Rheem Performance water heater, the reset button is located directly on the surface of the high-limit thermostat switch, which sits immediately above the upper and lower heating elements behind the insulated access panels. To access it safely, you must shut off power to the water heater at the main circuit breaker panel, remove the metal outer panel, and peel back the protective foam insulation cover. The reset button is typically a red button labeled "Reset" that requires a firm push until you hear a mechanical click. On gas Rheem Performance models, there is no traditional electrical reset button; instead, system resets are handled by turning the gas control dial off or cycling power to the electronic control module.
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