A06
Herz
Ignition Spark Fault
Boiler shows A06, intermittent ignition, sometimes noisy start
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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
Worn ignition electrode, damaged ignition cable, failing ignition transformer, poor earth connection on Herz boiler chassis
How to Fix / Troubleshooting
Safety: Turn off power and gas. High voltage is present at the ignition transformer.
- Check earthing: Confirm the boiler is properly earthed at the supply terminal. Loose earth can cause weak spark.
- Inspect ignition electrode: Remove and check for cracks, erosion, or contamination. Clean the tip and ensure the correct gap and position relative to the burner.
- Examine ignition cable: Look for burn marks, cuts, or loose connections between the transformer and electrode.
- Test reset: After reassembly, restore power and attempt a reset. Listen for a strong, regular clicking.
- Ongoing A06: The ignition transformer module may require replacement by a Herz service technician.
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Repair Difficulty
Medium
3/5
Required Part
Herz ignition electrode
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