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I had the same happen to me during my first winter with my 2018 Montana 3121RL, and as others above have posted, it was a faulty sail switch. The sail switch is a safety feature, so that if the blower isn't working, you don't have fire in an enclosure with no airflow. But when the switch fails (or debris gets sucked in the return air duct and prevents the switch from moving freely), then you have no ignition.
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