Heil DC90 flame rollout tripping

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Plumber69

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At first I thought it was the filter cause it was really dirty. Then I noticed the flame dancing when main blower came on. Pulled the heat exchanger and no signs of cracks. But 3 or 4 of the rivets popped out. Is this all it takes for the flame roll out to trip? I replaced heat exchanger and all is working good now. I also cleaned the secondary heat exchanger but wasn't that dirty. Originally trip around 5 minute mark
 
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Hey, wait a minute.

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