You say the pilot light is on, but is the burner on? If so and the burner is running and no hot water you may have a plumbing leak somewhere on the hot water side under the house or under a slab.
SOURCE: gas hot water tank, pilot light
Look inside the water heater when it is heating the water, the flame should be blue. If it has yellow tips on the flame, it needs an adjustment to the air shutter. There is a nut on this air shutter to make this adjustment. This adjusts the air gas mixture. You may first try just simply tapping on the burner lightly to loosen any debris that may have built up and vacuum it out. MAKE SURE YOU TURN OFF THE GAS BEFORE CLEANING THE BURNER!! Also, check for drafts that may be blowing out your pilot light, Furnace register or outside drafts on windy nights. Some water heaters have an automatic shut down if the water heater gets too hot, so don't have it set to its hottest setting. Most water heaters only last about 10 years or so, It could be you are ready for a new one....Joe
SOURCE: i have no hot water, the pilot light is on help!
First try turning the knob all the way to "pilot" then turn it all the way to its hottest setting.
It sounds like the thermostat/sensor is stuck. This may jar it into working again.
Also look for any leakage or water around the burner.
You will probably have to replace the gas valve in the near future.
Also try tapping the side of the gas valve.
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