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We've had similar issues in our 2019 315 Cougar. Our furnace would quit igniting usually at the best times 2-4:30am. It would try to cycle on but wouldn't light. My fix was to go outside with a flashlight and screw driver, and remove the furnace cover and toggle the power switch on and off till it started to work again. The diagnostic sticker in the furnace cabinet indicated 1flash every 3 seconds was a airflow/limit fault. Took it to the dealer who had it for 2 weeks and couldn't find anything wrong asked them to replace the sail switch or the whole furnace. Called Krapstone and they denied any issues with the furnace. The unit is an inbred cross between Atwood crap and Dometic junk. The dealer put in a new sail switched it's still working. So who knows? I'm just getting very disappointed with paying good money for something that has no quality or backing by Krapstone even under warranty. It seems to me their just hoping to out wait doing anything until the warrenty is done.
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