Staff Answer
Sep 27, 2026 - 11:42 AM
If it cools on AC but not LP with a good flame, the heat from the flame isn't getting into the cooling unit. Check the flue baffle (it can drop or get sooty), and clean the flue with a flue brush. In extreme heat, poor venting can also push it over the edge, so make sure the fan (if equipped) runs when it's hot and the vents are clear.
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