Goodman Delayed Ignition

Furnace makes loud banging or booming noise at startup when burners ignite.

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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.

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Possible Causes

Dirty burners, Misaligned burner orifices, Low primary air, Weak ignition source or poor flame carryover

How to Fix / Troubleshooting

Safety: Delayed ignition can be dangerous. Turn off gas and power before inspecting burners. If bangs are severe, call a professional immediately.

Steps:

  • Inspect burners: Remove burner assembly and clean burner ports and crossover channels with a brush and compressed air.
  • Check alignment: Ensure burners are properly seated and aligned with the gas orifices and that the ignitor and flame sensor are correctly positioned.
  • Observe ignition: After reassembly, restore power and gas and watch ignition through the sight glass. Flame should light smoothly across all burners without a boom.

If delayed ignition persists, a technician should check gas pressure, burner condition, and ignition timing.

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Repair Difficulty

Hard 4/5

Required Part

Burner Assembly
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