Believe they use an IGNITER with NO Pilot?. Check for spider web across igniter contacts? Check for spark when unit first turned ON. When it FAILS to ignite, circuit board will lock OFF for xx Minutes to clear gas, (maybe w/ a fan forced purge?) to PREVENT EXPLOSION. When first turned ON, should be sparking, then gas turns ON, then timer starts to PROOF Flame; with NO flame proofed, it shuts down gas/ spark, and displays fault. Hope this helps. Is gas tank turned ON? Gas ON at Burner? Spark? Loose or corroded wire on igniter or circuit board, or solenoid?
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