They don't have a pilot light at all. Gas water heaters are equipped with a thermocouple. The thermocouple senses when the pilot light is lit. When the thermocouple goes bad it will not send the right signals to the gas valve. When that happens the gas valve will turn off and the burner will night light.hey don't have a pilot light at all. Gas water heaters are equipped with a thermocouple. The thermocouple senses when the pilot light is lit. When the thermocouple goes bad it will not send the right signals to the gas valve. When that happens the gas valve will turn off and the burner will night light.
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