A total loss of heating capability in your water heater is typically caused by a tripped high-limit thermal reset switch, a burned-out heating element, or a faulty thermostat on electric units, or an extinguished pilot light, defective thermocouple, or closed gas valve on gas units. Over time, electrical components wear out, sediment accumulation overheats elements, and thermocouple sensors degrade, cutting off thermal production. Verification: Check the water heater reset button, test breakers, and inspect burner status.
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