If an electric water heater continues overheating and boiling water even when the thermostat is turned down to its lowest setting, the root cause is almost always a fused or stuck thermostat switch. When internal electrical contacts weld themselves together permanently due to electrical arcing, power flows continuously to the heating elements without cycling off. Callout type="warning" title="Electrical Safety Warning": Turn off the main circuit breaker immediately to prevent dangerous pressure buildup and potential T&P relief valve discharge. Verification: Test thermostat continuity with a multimeter.
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