A10
De Dietrich
Flame Detection Error (False Flame or No Flame Signal)
Boiler shows A10, burner off, fan may continue to run
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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
Ionisation electrode detecting residual flame signal, Moisture or soot on flame sensor, Faulty main control board flame circuit, Incorrect earthing of De Dietrich boiler
How to Fix / Troubleshooting
Safety: Isolate power and gas before working on the burner or electrical connections.
Steps:
- Check earthing: Ensure the boiler is properly earthed and that the earth conductor is securely connected. Poor earthing can cause false flame detection.
- Clean ionisation electrode: Remove and clean the flame sensor with fine abrasive paper. Remove any soot or moisture. Reinstall at the correct distance from the burner.
- Inspect wiring: Check the ionisation cable for damage and ensure it is routed away from high‑voltage ignition cables to avoid interference.
- Reset boiler: Restore power and reset. If the error persists, the control board may be misreading the flame signal.
Professional help: A technician can measure the ionisation current and determine if the PCB or electrode needs replacement.
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Repair Difficulty
Hard
4/5
Required Part
Ionisation Electrode
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