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I had a similar issue on my 2018 Cougar 367FLS in May. I pulled off access panel to the heater. Removed exhaust pipe and expose control board. Control board has two wires connected. At the advice of my local RV tech I unplugged both wire and waiting 30 seconds. I plugged them back in and this basically rebooted the control board. Reinstalled exhaust pipe(it would not ignite without exhaust pipe in place). All worked good after that.
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