I am having the same problem, but only when it is really cold outside.
If it is not real cold and I just want to knock the chill out of the Airstream, it works fine, but when really cold, it stays on a few moments, goes off, tries again 2 more times and no longer tries to lite.
Does that help determine what the problem might be?
From reading this post, it could be any of these:
- Defective fan box
- Circuit board bad
- Flame sensor
- Flame rod
- High limit switch
- Rusted out burner tube
- Sail switch
Thanks for any help!