If your water heater's high-limit thermal reset button fails to click or does not restore power, it indicates that the water inside the tank has severely overheated, or the thermostat switch has suffered permanent electrical failure. Callout type="warning" title="Electrical Safety Warning": Turn off the main electrical circuit breaker immediately. Test the thermostat and upper heating element with a multimeter for shorts. Verification: Measure electrical continuity across the thermal switch terminals to determine if component replacement is necessary.
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