Furnace makes loud banging or booming noise at startup

Safety first: Turn OFF gas and power immediately if you hear loud booms. Do not continue to operate the furnace until inspected.

• Inspect burners: With power and gas OFF, remove burners and clean ports with a soft brush and compressed air. Ensure each burner seats properly in the manifold.
• Check ignitor position: Confirm the hot surface ignitor is correctly positioned in front of the first burner so gas ignites immediately.
• Do not adjust gas yourself: Gas pressure must be set with a manometer by a licensed technician following Kelvinator specifications.
• Professional inspection: If banging persists, have a technician inspect the heat exchanger and combustion system for damage.