A07
De Dietrich
Flame Detection / Ionisation Fault (Intermittent)
Boiler displays A07, intermittent lockouts especially in windy conditions
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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 flame signal, poor earth connection, corroded ionisation electrode, unstable combustion due to flue issues
How to Fix / Troubleshooting
Safety: Turn off power and gas before removing covers. Combustion adjustments require a qualified engineer.
- Check earthing: Ensure the boiler is properly earthed at the supply. Loose earth can affect flame detection.
- Inspect ionisation electrode: Clean the electrode rod and check the cable and connector. Replace the ionisation electrode if pitted or cracked.
- Check flue integrity: Visually inspect the flue joints for signs of leakage or disconnection. Wind effects can disturb combustion if the flue is incorrectly installed.
- Technician tasks: A professional should measure the flame signal in µA, check combustion values, and adjust gas valve or replace electrodes as needed.
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Repair Difficulty
Professional Required
5/5
Required Part
Ionisation Electrode
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