The igniter serves not only to spark for lighting the burner, but also to sense the presence of the burner flame. If there is no "proof of flame" sent to the control board by the igniter, the system will shut down after three attempts, as you've witnessed.
From your description, it appears that the igniter itself, it's connection to the control board, or the control bord is faulty. The igniter should "tick-tick-tick" at the same time you hear the click of the gas valve opening, and also maintain the flame if lit manually. Since this is not happening, the major suspect is the igniter and its connections. If that is not the remedy, the control board is the next suspect.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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