Home Improvement Questions? Ask a Handyman for Answers
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What's tripping the main limit or the rollout sensors that are just outside the burner chamber (see attached pic for typical)
Ok, if the rollouts are tripping then the heat exchanger is at least partially clogged and it needs to be cleaned by a pro.
Do you have more questions?
If the burner flames distort after the main blower comes on that would be an indication of a cracked heat exchanger