Hi, Brenda and Welcome!
A few things:
Our N811 works well on both
A guess would be that your LP burner and/or burner area is dirty
You can find a manual at bryantrv.com that should help with troubleshooting
This is a "Tech Issues" forum matter - Tech Support is for web, forum, etc matters
I'm asking Moderator to move this thread
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB