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Water Heater Too Hot

The part(s) or condition(s) listed below for the symptom Water heater too hot are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Water heater too hot

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Cause 1Gas Valve and Thermostat Assembly

The thermostat determines the maximum water temperature setting. If the thermostat is defective, the water temperature may not be set at the proper level. To determine if the thermostat is defective, assess hot water temperature from the nearest faucet. If the water temperature is hotter than the selected thermostat setting, this indicates that the thermostat is defective. If the thermostat is defective, replace the gas valve and thermostat assembly. We recommend a set temperature of 120 degrees or fewer to prevent the risk of scalding.

Parts
Cause 2Heating Element

If the heating element is shorted out, it will heat continuously, causing the water to get too hot. To determine if the heating element is shorted out, use a multimeter to test if the element is shorted to ground. If heating element is shorted out, replace it.

Parts
Cause 3Thermostat

The thermostat determines the maximum water temperature setting. If the thermostat is defective, the water temperature may not be set at the proper level. To determine if the thermostat is defective, assess hot water temperature from the nearest faucet. If the water temperature is hotter than the selected thermostat setting, this indicates that the thermostat is defective. If the thermostat is defective, replace the thermostat. We recommend a set temperature of 120 degrees or fewer to prevent the risk of scalding.

Parts