Well, I no longer have a TM (loved them!), but I MAY be able to help solve the ignition problem. Or, at least give you something else to look at.
I have an Atwood furnace in my current trailer. It has similar problems as all other TT furnaces. I have replaced the sail switch a few times, and messed with it (key point!) on our last trip. I had a backup, and put it in. The backup had a hard plastic guard over the sail, so I tried bending the old sail back to that shape. I put the old sail switch back in, and it worked, temporarily. So, I turned-up the thermostat and went outside so I could look for the error code.
The unit fired-up (which it wouldn't do if the sail switch was not working), and was not staying ignited. It would re-ignite without the blower turning off, and did this a few times. Then, I saw a backfire flame come out the exhaust port. HMMM!
I recalled that on the Lance Owners forum, someone had said to check the bottom knockout of the furnace housing. I had done that in the past, and the knockout had fallen out, so I put it back on with duct tape. I looked under my furnace (inside, through the cold-air return), and the knockout had fallen out again. I put it back on (again with duct tape, as that is all I had with me), and tried the furnace again. IT WORKED FINE!
So, the point is, check your furnace housing for a missing knockout. I don't know why that would impact the combustion process, but mine works great if the knockout is in place (I have since put it on with muffler tape, and support it now with a 1" x1" post). Heck, one of my wail switch replacements may have been unnecessary, if the missing knockout was causing the problem back then.
Good luck!
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