Keystone Bullet Atwood Furnace removal

Look for an owners manual online for the Atwood furnace model that you have. There should be troubleshooting tips as it sounds like the same problem we had when the ignitor just needed to be adjusted to that the flame would light. You may also just have dirty connections, a critter nest, mud daubers, dirty burner etc causing the problems. There is usually an access door on the outside for this purpose. Maybe the manual will also instruct on how to remove. I think Bryant RV has the manuals online that you can view or download for free. Do a google search and it should pop right up.