RV Heater Troubleshooting

[brthrmsg]

I was wondering if someone out there might have string of troublshooting ideas I might use to fix my heater or find out what is wrong.
The fan blows but no heat is generated.
Last fall the heater was working fine then the first trip out this year nothing.
Thanks

[mike4947]

Here's a link to get a manual for your furnace. http://bryantrv.com/docs.html
 
But common problems when the fan comes on are low 12 volt voltage so the fan can't keep the sail switch open, spider webs in the gas jet, and relocated thermobulb on pilots.

[tlhdoc]

I like to start with the simple things.  Do you have your propane turned on?  Try running the furnace with the camper plugged into an electric outlet.  Can you hear the igniter clicking after the fan comes on?  From the outside can you smell propane coming out of the furnace exhaust when the furnace is trying to light (you should hear several clicks).