furnace not lighting/co detector

Thanks for the Bryant RV link looks like it has some phenomenal information and with a little persistence much can be resolved.

Well, it is working again. Dumb luck, idiotic persistence? I hadn't found the on/off switch previously, which enabled more rapid on/off tests than using the tstat. (thanks to bryant rv guides) I disconnected several leads, took out the electrode, tapped on the gas valve, etc.to no avail, although I did notice some change in the operation (it was running the fan longer, for example). Then I started messing around with the stereo, which led to me pulling fuses so I decided to pull the furnace fuse. I had pretty much given up but I gave it one more try. I heard a distinct click after the purge cycle and voila, ignition! Seems to work correctly, but i will keep checking over the next few days. I'm guessing at this point but maybe tapping the valve or resetting the fuse unstuck the gas valve. Thanks for all the advice!
I found the bryant rv guides here.
http://bryantrv.com/docs.html#google_vignette

I definitely have propane. (Being a newbie I took the tank to get it topped off before our first outing, it turned out to be full!)   I have been running the stove as that worked to get the fridge to light (learned that trick on this forum). I've vacuumed and blown out all the webs and debris I could see without taking the unit out. I started to take off the outside plate to see if there's obstruction there, but it seems like it is getting good flow, it sends the sail switch, then shuts off. I also didn't want to have to reseal it unless I had to. I will see if I have time to try the troubleshooting info I found, but I have a service call scheduled as I'm needing it solved for an upcoming trip.

Not to be a wise-acre, but have you checked your propane tank to see if it's empty?

Mine will click (spark) about 5 times and quit if it has no gas or there is air in the line. I can light and burn a stove eye for a few seconds to vent and air.

If it is surface mount, I recommend replacing it with a flush mount model. It is more out of the way of foot traffic and looks better. It does cost a bit more though. This is the one I used: