If ut runs long enough to light the burner and it blows warm air, I don't think it's a sail switch.
1. Quick test, try swapping the black 15A self resetting fuse with a spare blue 15A fuse.
2. Possible bad circuit board. Jim Vititow documented this. Some bad boards fail in below freezing temperatures. Try heating it with a hair dryer. Once it warms up enough close the cover. The warm air through the furnace should be enough to keep it running until you can get it fixed. I Did that trick one time after watching Jim's video. Control board was replaced under warranty. Never had a problem since.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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