Zline Improper Air-Gas Mixture or Contaminated Burner

Gas cooktop burner flame is yellow, lifting, or producing soot on cookware.

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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

Incorrect gas type or conversion, Blocked air shutter, Dirty burner ports, Low primary air due to installation

How to Fix / Troubleshooting

Safety first: Turn burner OFF and allow it to cool. Do not operate the range in this condition for extended periods due to carbon monoxide risk.

  • Clean burner: Remove burner cap and head. Clean thoroughly with warm soapy water, dry completely, and clear ports with a soft brush.
  • Check for drafts: Strong drafts can distort the flame. Adjust nearby windows or ventilation.
  • Verify gas conversion: Confirm the range has been properly converted for LP or NG using the correct Zline conversion kit. Yellow flames are common when using the wrong orifices.
  • Adjust air shutter (if accessible): Some burners have adjustable air shutters at the base. A technician can adjust these to achieve a stable blue flame.

When to call a technician: Persistent yellow or sooty flames require professional adjustment of orifices and air shutters and verification of gas pressure.

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Repair Difficulty

Medium 3/5

Required Part

Burner Head and Orifice or Air Shutter Assembly
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