More than likely the gas valve is defective.
SOURCE: pilot light won't stay lit after release of gas valve.tried few t
Most likely it's time to replace the thermocouple, the safety device that makes sure the pilot is lit. New thermocouples are cheap and you can find them at most hardware stores and the big-box places (Home Depot, etc.)
Here is a site with basic information to get you going.
SOURCE: AO Smith water heater won't fire.
I bet your thermo couple is bad or your ports are clogged? How old is the unit?
SOURCE: Tankless water heater pilot light will not stay on
It is most likely the water valve stuck open, telling the controls to heat water, that it thinks is flowing through it, but without actual flow it overheats. Depending on how comfortable you are with taking it apart yourself, you could open the valve to see if it just needs cleaned out, or if you have a ruptured diaphragm or some other cause.
SOURCE: pilot light on water heater wont stay lit
The thermocouple has failed. It is the temp probe that goes from the pilot lite burner area to the control valve. Go to your local plumbng repair shop and buy one. Most appliance parts stores have them also. Take the old one with you and they will hook you up with an exact replacement. They are not that hard to change. Usually a nut or 2 screws in the temp bulb area at the burner end and a nut that threads into the control valve.
Make sure before you install the new one that the area where it mates to the gas valve is clean. Should be about a 20 min job including clean up with replacement parts in hand.
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SOURCE: Pilot will not relight properly
Hi,
The thermocouple needs to be replaced. That is what keeps the pilot light lit. The thermocouple is the little metal probe that sticks up into the pilot flame. Very easy to replace.
heatman101
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