Boiler ignites with a loud boom or delayed ignition noise.

Safety first: Turn off power and gas. Delayed ignition can be dangerous and should be addressed promptly.

• Step 1 – Inspect burner: Remove the burner assembly as per the Bradford White manual. Check for rust, lint, or debris on the burner surface and in ports. Clean with a soft brush and vacuum.
• Step 2 – Check igniter position: Ensure the hot surface or spark igniter is correctly positioned relative to the burner as specified by the manufacturer. Adjust carefully if misaligned.
• Step 3 – Gas pressure and valve (pro): A technician should measure inlet and manifold gas pressure and verify the gas valve opening characteristics. Replace the valve if it is slow to open or sticking.
• Step 4 – Combustion check: Have a professional perform a combustion analysis to ensure proper air/fuel ratio.

Warning: Do not continue to operate a boiler with delayed ignition; it can damage the burner and heat exchanger and pose a safety risk.