we have a 2024 Avenue 32 RLS and when we went to light the furnace this morning it turns on with the fan. the igniter is clicking and the propane turns on for a second. you hear the flame burning and then it just flames out. I went outside and listened from the side of the trailer and you could hear the fan running the igniter and the propane turn on it. ignites and heat comes out of the vent and you can smell the burn propane a little bit and then it just shuts off. no no heat coming out the exhaust pipe outside. any ideas? any help would be appreciated. I am pretty mechanical and if someone could lead me in the right direction that would help. Thanks