This video applies to most DF-series furnaces by Dometic. Here, I'm replacing the sail switch mounted at the rear of the furnace in my Sunset Park Sun Lite 16BH travel trailer.

The sail switch detects air flow in the furnace. If it is dirty or defective, the furnace will kick on with the fan-only, but never ignite. This was my issue. Cleaning the switch and everything behind the furnace resolved my problem.

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