On modern Rheem electric water heaters, the high-limit thermal reset button is located behind the upper metal access panel and insulation blanket on the thermostat control housing. To access it, you must first turn off the electrical breaker, unscrew the metal panel, and peel back the insulation. For Rheem gas water heaters utilizing electronic ignition or integrated safety systems, reset procedures vary; some feature a blinking LED diagnostic error code light on the gas control valve rather than a physical reset button. Verification: Inspect the upper control housing for the red high-limit thermal switch button on electric models.
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