2008 3100 SS Furnace Woes

[Buck_TN]

Having troubles getting heat. Would not light, fan works, igniter clicks. I blew air into outside both vents outside thinking a bug or web was inside even though both looked very clean. Got the furnace to light. However once unit heats camper and shuts down it will not relight. Ran great during that cycle. Any ideas?
My book says it's a Suburban Furnace SF-30F

[SeaDog]

check and clean the propane orifice on the gas valve and the tube leading to the ignition point. I use air to blow these out.

[Buck_TN]

That worked. It was many tries later but the furnace is working like a charm! We knew it had to be something stupid like that but after blowing it a couple times and still not helping, I went to other avenues. What a waste of time. Went back to compressed air to blow it and it finally cleared. Thankyou !