How to light the pilot light on a John Wood Pro Series Flame Guard water heater. If you do not have any hot water and you have 1 of these water heaters, check to see if the pilot light is out. I had mine for 5 years and the pilot light stayed lit the complete time. 1 day it began going out. This model can get the air vents plugged up with dust and so on. which makes the pilot light go out. I will show you how to preserve the pilot light lit when you let go of the red button. Mine now stays lit for about a week or two, and I have to go by means of the identical method to light it once again. Apparently no permanent fix is obtainable. My service organization advised replacing the entire water heater. Ouch!