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There are several limit switches in the unit there in various places in burner compartment. One on blower housing . One thing that I would try is replaceing your filter and turn the power off to the furnace and try starting the system after power is D/C for 5 minutes.
Replace pressure switch. If you blow any air into the pressure switch it has been damaged,check air ports for debris by looking never ,never blow on air switch they work on a very small pressure or vaccum,where your breath is to much pressure and also loaded with unwanted humidity.
Well this one is trying to detect flame, please try checking the fire eye clean the lens with windex and a terry cloth rag and try to fire it up. Make sure that this eye has an unobstructed view to the flame, not a correct thing to do but jump the eye out and see if you run longer if so replace the fire eye.