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: The most common reason a unit runs "hot" (overheating) is a stuck thermostat that fails to shut off the heating element. Temperature-Pressure (T&P) Valve ebwh139 hot
: In older tanks, mineral scale can cause the bottom element to overheat or the tank to make popping sounds. 2. Automotive Components If this is a part in a vehicle: Coolant Temperature Sensor ebwh139 hot