Staff Answer
Sep 27, 2026 - 06:31 PM
Popping and flame-outs usually mean the burner isn't getting a clean draft or the flame is sitting off the flue. Make sure the burner is lined up directly under the flue tube, and that the flue and baffle are clean. Check that the orifice matches what the new cooling unit's maker specifies. Aftermarket units sometimes need a specific burner/orifice setup, so check with the coil manufacturer. Wind blowing through the lower vent can also cause it.
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