A06

Fondital Ignition Control / Spark Fault

Boiler shows A06, ignition attempts are irregular, sometimes with loud clicking, no stable flame

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.

Possible Causes

Cracked ignition electrode on Fondital burner, Damaged ignition cable or poor earth connection, Moisture or contamination in combustion chamber, Faulty ignition circuit on main PCB

How to Fix / Troubleshooting

Safety: Turn off power and gas before any inspection. Do not open the sealed combustion chamber yourself.

User checks:

Reset: Perform one reset and observe. If the boiler repeatedly clicks without lighting, stop resetting.
Condensate drain: Ensure the condensate pipe is not visibly frozen or kinked, as this can cause moisture buildup.

Technician actions:

Inspect and replace the ignition electrode and HT lead if cracked or carbonised.
Check the earth connection between burner, chassis, and mains.
Dry and clean the combustion chamber if moisture or condensate ingress is present.
Test the main control PCB ignition circuit and replace the PCB if no spark output is present.

Repair Difficulty

Hard 4/5

Required Part

Ignition Electrode

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