F17
Saunier Duval
Flame detection circuit fault
F17 error, unit fails to detect flame despite ignition sparks
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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
Broken ionization electrode cable, Contaminated electrode insulator, Faulty PCB flame detection circuit, Incorrect electrode grounding
How to Fix / Troubleshooting
Safety first: Isolate power and gas.
Steps:
- Inspect electrode and cable: Look for cracks in the ceramic, damaged cable insulation, or loose connections. Replace if any defects are found.
- Clean electrode: Remove light soot or oxidation from the electrode rod with fine abrasive.
- Check mounting: Ensure the electrode bracket has good metal contact with the burner and chassis for proper grounding.
- PCB test: If all hardware is good, the PCB flame detection circuit may be faulty and the board will need replacement by a technician.
Warning: Do not attempt to bypass flame detection. This is a critical safety function.
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Repair Difficulty
Hard
4/5
Required Part
Ionization Electrode
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