American Standard Delayed Ignition / Burner Light-Off Problem

Furnace makes loud banging or booming noise at startup

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Dirty burners causing gas buildup, Misaligned burner crossover ports, Low primary air to burners, Weak hot surface igniter on American Standard furnace

How to Fix / Troubleshooting

Safety: Delayed ignition can damage the furnace. Turn off gas and power and call a professional if bangs are severe.

Homeowner actions:
- Do not continue to operate the furnace if banging is loud.
Professional service:
- Remove and clean burners thoroughly.
- Inspect and clean crossover ports.
- Verify igniter position and replace if weak.

Repair Difficulty

Professional Required 5/5

Required Part

Burner Assembly

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