Sub-Zero Delayed Ignition / Burner Flashback

Gas cooktop produces a loud popping or booming sound when lighting or during operation.

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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 burner ports, Misaligned burner cap, Incorrect gas pressure or orifice size

How to Fix / Troubleshooting

Safety first: Turn off the burner immediately if you hear loud pops or see flames under the burner cap. Shut off gas if the issue persists.

Steps:

  • Clean and realign: Remove the burner cap and head. Clean thoroughly and reinstall, ensuring proper alignment and seating.
  • Observe ignition: Light the burner and watch where the flame first appears. It should ignite smoothly at the ports near the electrode, not under the cap.
  • Check gas conversion: If the appliance was recently converted between natural gas and LP, verify that the correct Sub-Zero/Wolf conversion kit and regulator setting were used.
  • Professional pressure check: If popping continues, have a qualified technician measure manifold pressure and adjust orifices or regulator as needed.

Warning: Repeated delayed ignition can damage burner components and pose a safety risk.

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Repair Difficulty

Medium 3/5

Required Part

Burner Orifice
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