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didn't read this whole thread, but the OP's question? if, when its cold, and you turn on the furnance, the fan runs for a while but the furnace never sparks on (phwhump!), it is indeed probably the sail switch. mine had some polyester curls of thin threads kinda keeping it from working right. cleaned those out, and it worked great.
sequence is, thermostat says 'furnace on'. so the furnace starts its fan, waits a bit, then checks the 'sail switch' to ensure air is blowing, then turns on and sparks the gas, fwump!. if the sail switch never signals theres sufficient airflow, it will time out and shut down, and not even try again, unless you switch the thermostat off and on again.
to clean it you pretty much have to pull the furnace out, on my 2014 E21 Classic, its under the street side dinette bench, and you pull it out from inside. once its about half out, you can access the air 'sail' switch on the side of the furnace, remove it, and clean out any fluff you can see, ditto, vacuum out any dust and fibers you see around it and the whole area. if there's fibers stuck in the microswitch at the hinge of the sail plate, clean them out, and insure that switch works, and the sail flap moves smoothly in and out
this all is probably specific to some Atwood furnace modal they were using in 2014. I dunno. worked for me.
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