First, what brand and model water heater do you have? There are some subtle differences between Atwood and Suburban and between the 6, 8, 10 and 12 gallon models.
For most, have you pushed the gas thermostat/high temp reset button? It's located under the outside hatch cover, in the upper left corner of the water heater, under a rubber plug. Just push on the rubber, you should feel the switch "click" when it resets.
Also, have you cleaned the burner tube/ignitor system? Often spiders will build a nest in that area. For some reason, they tend to migrate toward the smell of propane. Use a tooth brush to clean the area and if you have one, use an air compressor to blow out the debris.
Otherwise, it's check electrical connections, make sure things look "normal" (not burned or discolored) and hope it works.
Possibly you've got a bad igniter control board. If so, replacing it will usually fix the problem. Don't buy a replacement board until you've exhausted the other steps, they are fairly reliable and don't fail often.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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