IGN-L
Laars Repeated Ignition Failure Lockout

Boiler displays IGN-L or Ignition Lockout; multiple failed ignition attempts.

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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 ignition electrode gap, Dirty burner or blocked burner ports, Low inlet gas pressure, Faulty ignition transformer or module

How to Fix / Troubleshooting

Safety first: Turn off power and gas before removing burner or ignition components. Do not repeatedly reset without correcting the cause.

  • Inspect burner: Remove the burner assembly per Laars instructions. Check for rust, debris, or blocked ports. Clean with a soft brush and vacuum; do not enlarge burner ports.
  • Check electrode position: Verify the spark electrode gap and position relative to the burner as specified in the Laars service manual. Misalignment can prevent reliable ignition.
  • Examine ignition cable: Look for cracks or burn marks on the high-voltage cable. Replace if damaged.
  • Reassemble and test: Reinstall burner and electrodes, restore gas and power, and attempt a restart. If IGN-L returns, stop and call a technician.

When to call a professional: Detailed ignition diagnostics and gas pressure checks require specialized tools and training.

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Repair Difficulty

Professional Required 5/5

Required Part

Ignition Electrode Assembly
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