Staff Answer
Sep 27, 2026 - 06:25 PM
If it works fine on AC but not on LP, the cooling unit is fine, and the problem is on the gas side. The most common cause is a dirty flue or burner. Rust flakes fall onto the burner and choke the flame. Clean the flue with a flue brush and make sure the baffle is hanging in the flue. Then clean the burner and orifice (the orifice with alcohol only). Once that's done, it should cool as well on propane as on AC.
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