Does the igniter glow? Also see what the LED on the control board is telling you. It will have a number of slow flashes then a number of fast flashes forming a 2 digit number.
hot surface igniter
If the igniter is not glowing then that is your problem. It should be a bright black color if it is white and brittle looking it is bad. It may even have a hair line crack in it like this one shows.
Notice the white mark where it shorted and cracked.