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Are you getting 24 volts to the gas valve?
OK do you have a volt meter for troubleshooting and do you know what the limit switch looks like?
Feel up by the draft hood where vent leaves furnace and see if here might be a little button that will push in on this switch to reset.
This should be on side of draft hood, May need a flashlight. Did you see the picture showing where it should be?
I have to leave for the evening so I will open to other experts.I will check back in the morning to see if you got this solved.
OK I am leaving but have opted out to see if any one else might help. If not, you can pickup a cheap multi meter at Walmart for about 15 bucks if you choose and we can go step by step to figure this out.