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I'm assuming that you have it in heating mode and that it is a gas fired furnace. There is a fan that exhausts combustion air out of the combustion chamber. It runs for a few minutes after the burner turns off in order to exhaust remaining gases. The timer unit may be malfunctioning on this feature.

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16y ago
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Q: What is wrong when my central air unit fan continues to run even when the unit is off?
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