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Water heater boards have a "three try" cycle, where they will try to ignite three times, then shut down and the little red light next to your switch will come on. If it ignites each time before shutting down (you should hear it burn), and it does this three times it is either a flame semsor problem, or the flame is so bad it's not producing enough heat to activate the sensor. Open your outside heater door and check the flame while burning. If it's not a full blue flame, then your burner tube needs cleaned. If the flame is OK, then you have a ignitor board problem.
Hope this helps.
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