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The thermocouple has to be maintained hot enough by the pilot flame or it will cause the gas valve to shut down all of the flow of gas. The pilot flame is probably set too low (easily adjusted with a screw driver) to satisfy the thermocouple. If not the thermocouple or the gas valve may be bad. I like to keep the flame just high enough and aimed to satisfy the thermocouple and not make it red hot

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Q: When you lite your pilot light for your water heater then try and turn the temperature uo the burner stays on for a secnd then goes out along witht he pilot light what is causing this?
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