29
Vokera Poor Combustion / Low Ionisation Current

Code 29, furnace may light but then shut down, sometimes with yellowish flame

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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 injectors, Incorrect gas pressure, Faulty flame sensor, Poor earth connection

How to Fix / Troubleshooting

Safety: Turn off power and gas. Combustion adjustments must be done by a gas-safe engineer.

  • Visual burner check: Remove the burner (qualified persons) and inspect for rust, debris, or blocked ports. Clean with a soft brush and vacuum.
  • Check earth bonding: Ensure the furnace chassis is properly earthed and that the burner has a solid metal contact to the chassis.
  • Clean flame sensor: As with other flame faults, clean the sensor tip and ensure correct positioning.
  • Professional combustion analysis: A technician should check gas inlet pressure, burner pressure, and flue gas composition with an analyser.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Burner Assembly
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