Gas control valve thermostat might be bad.
The copper cylinder located on back of gas control that sticks into water is the thermostat.
If thermostat is not reading correct temperature, then gas might stay lit.
Usually the gas control will sense overheated water and trip the ECO so no gas will flow to burner.
In any case, the gas control valve is replaced.
http://www.adventurerv.net/images/91601.jpgOpen following links to see typical manuals, service manual, parts link, and other resources:
http://waterheatertimer.org/Atwood-water-heater-resources.html
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