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Replacing a Water Heater Thermocouple or Flame Sensor


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Water Heater Thermocouple
Water Heater Thermocouple

Water Heater Thermocouple

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Similar to that found on a gas furnace, a thermocouple is used to control gas flow in gas water heaters including older style standing pilot models and newer electronic ignition pilot models (e.g., Piezo Igniter). The thermocouple is part of or attached to a pilot burner assembly and will connect to the gas control valve on the outside of the water heater.

Quite often the reason a water heater pilot does not ignite or a burner does not stay lit is because of a problem with the thermocouple.

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