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Hello, it is quite likely that the ignition module built into the gas valve is bad and will have to be replaced...if you are a highly skilled technician I might be able to coach you through a further diagnosis and repair.
Lacking that, tell me which direction you are from the center of the nearest town or city and I will get you a short list of well rated service outfits in the area.
Tell me please also about how old the water heater is.
We can go from there.