Suburban Furnace intermittently doesn't light

Thank you all for your advice. As dirty as the sail switch and squirrel cage are, I am guessing that it needs to be cleaned. I wanted to try everything I could short of pulling it out. But that is what needs to happen now.


I smell the propane because the unit is right under the stove and that is also where the vent is. Its just a wiff of what didn't ignite.

That youtube video helped me understand my unit. Thanks for that!