Happy New Year! Yes, I realize that this post is OLD but I was able to resolve my lighting
issue with my 2006 Scamp
16' with the NT model furnace
I tried purging the LP lines and checked the battery
(which was low).
I took the cover off the furnace
and accessed the Igniter Electrode which seemed relatively dirty but otherwise unharmed.
I thought about it as a spark-plug and if anyone has ever re-gapped their spark-plugs in a car or truck it can make a world of difference on how it makes their vehicle run.
So I re-gapped it and brought it a hair closer to the burner assembly. Put it back together and boom! (not literally) The thing fired right up.
No holding your hand over the exhaust or anything!
If you don't want to re-gap the electrode their are cheap: https://pantherrvproducts.com/suburb...ter-electrode/
This is the burner assembly which did show some wear: https://www.ebay.com/itm/Suburban-MF...-/163239676485
This took me all of 10 minutes to fix.