A01
Immergas
Ignition Lockout (No Flame)
Boiler displays A01, ignition lockout, burner does not light, user must reset.
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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
No gas supply to boiler, Faulty ignition electrode or cable, Faulty ionisation electrode, Gas valve not energised
How to Fix / Troubleshooting
Safety: If you smell gas, do not attempt to reset the boiler. Ventilate the area and contact emergency services and a gas engineer.
- Check gas supply: Confirm that the gas isolation valve under the boiler is open and that other gas appliances work.
- Reset once: Press the reset button as per the user manual. If A01 returns repeatedly, do not continue resetting.
- Engineer checks: A qualified technician should inspect and clean the ignition and ionisation electrodes, verify correct gap and position, and test the gas valve and wiring.
- Component replacement: Replace faulty electrodes or gas valve as required, then recommission the boiler with combustion checks.
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Repair Difficulty
Professional Required
5/5
Required Part
Ignition and Ionisation Electrode Assembly
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