Montpellier Incorrect Air–Gas Mixture / Burner Contamination

Uneven or yellow flame on Montpellier gas hob burners.

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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

Blocked burner ports, Incorrect burner cap placement, Wrong gas type or injector size, Insufficient primary air

How to Fix / Troubleshooting

Safety first: Turn off the burner and allow it to cool before handling. Yellow, sooty flames can produce carbon monoxide; ventilate the room.

  • Clean burner: Remove the burner cap and head. Clean all ports with a soft brush and warm soapy water. Dry thoroughly before refitting.
  • Correct assembly: Ensure the burner head and cap are seated correctly and level.
  • Check gas type: Confirm the appliance is set up for your gas type (natural gas or LPG). Using the wrong injectors can cause yellow flames; conversion must be done by a gas engineer.
  • Ventilation: Ensure adequate room ventilation as per Montpellier installation instructions.
  • If flames remain yellow: Have a Gas Safe engineer check injector sizes and adjust air shutters if fitted.
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Repair Difficulty

Medium 3/5

Required Part

Burner Head and Cap
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