Daikin furnace makes loud booming or rumbling noises at burner ignition.

Safety: Booming ignition can indicate dangerous gas buildup. Turn off the furnace and gas supply and contact a professional if the problem is severe.

Steps to check (visual only for homeowners):

• Inspect burners: With power and gas off, remove the burner access panel and visually inspect burners for heavy rust, debris, or misalignment.
• Check igniter position: Ensure the hot surface igniter is properly positioned in front of the burner where ignition should occur.

Burner removal, cleaning, and gas pressure adjustment must be performed by a licensed technician familiar with Daikin furnaces.