What does error code 33 mean on a Kenmore gas furnace?

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Error 33 is a Limit Circuit Fault. It means that the high limit or flame rollout switch is open. This can lead to error code 13, Limit Circuit Lockout. Error 13 means that the limit or flame rollout has been open for more than 3 minutes. To address this issue, we need to ensure the furnace has proper air flow, and increase it if necessary.

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