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The reset is a high limit safety device that cuts the voltage off when the temperature of the water tank becomes too high. If you feel that the water temperature is hotter that usual this is a good sign that the thermostat is not working. Check and make sure that the setting of the thermostat has not been altered. It should be set for around 140F. If the setting has not been adjusted then there is a good chance that the thermostat needs replacing

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Q: Why does a reset pop on a hot water heater?
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