First shut off the gas valve on the water heater and the gas valve on the gas line near the heater.
Gas water heater thermocouple.
If the pilot light goes out the thermocouple acts as a safety device by preventing the gas valve from opening and potentially filling the area surrounding the water heater with natural gas.
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On older style heaters with standing pilot lights the device is typically called a thermocouple while on newer units with electronic ignition the same or virtually the same device is called a flame sensor.
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The element is built for reliability and long life.
A faulty thermocouple or one that is simply dirty may consistently prevent the gas valve from opening or the pilot from staying lit.
Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve.
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Honeywell home cq100a1005 u cq100a1005 replacement thermocouple for gas furnaces boilers and water heaters 36 inch.
The burner typically sits loosely or under clips in the burning chamber and just slides out.
It is designed for gas furnaces and 30 mv systems.
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The gas water heater thermocouple is the safety element that is designed to inform a gas control valve is the pilot flame on or off and open or close the gas to the main burner.
This signal keeps the gas valve open.
Positive positioning for quick insertion.
The thermocouple is part of the pilot assembly where one end is always in contact with the pilot flame while the other side is connected to the gas control valve.
A thermocouple or flame sensor is a device used to control gas flow in gas water heaters.
When you re having trouble getting the pilot to stay lit it could be because the thermocouple needs to be replaced.