34
Luxaire Ignition Proving Failure

Furnace LED displays code 34; ignition sequence starts but burners do not light or light inconsistently.

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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

Weak or cracked hot surface ignitor, Low gas pressure, Dirty burners, Faulty gas valve

How to Fix / Troubleshooting

Safety: Turn off power and gas before removing burner access. If you smell gas, do not attempt ignition.

Steps to check:

  • Inspect ignitor: Remove the hot surface ignitor and check for cracks or white spots. Replace with the correct Luxaire ignitor if any damage is found.
  • Clean burners: Remove burner assembly if accessible. Brush off rust and debris, and blow out burner ports with compressed air. Reinstall carefully, ensuring proper alignment.
  • Check gas shutoff: Verify the manual gas valve is fully open.

When to call a pro: If code 34 persists, a technician should measure ignitor resistance, gas pressure, and gas valve operation, and may need to replace the gas valve or control board.

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Repair Difficulty

Hard 4/5

Required Part

Hot Surface Ignitor
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