F41
Saunier Duval
Incorrect Gas Setting / Combustion Fault
Furnace shows F41, ignition issues, may be related to incorrect gas type or settings
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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
Appliance set for wrong gas category,Incorrect burner pressure adjustment,Wrong injector size fitted,Faulty gas valve modulation
How to Fix / Troubleshooting
Critical safety warning: Gas type conversion and combustion adjustment must be done by a licensed gas technician.
- Verify gas type: Confirm that the furnace is configured for the gas type supplied (e.g., natural gas vs LPG) and that any conversion kits have been correctly installed.
- Check injectors: Ensure the correct injectors are fitted for the gas type and model.
- Adjust burner pressure: A technician must set burner pressure and verify combustion with a flue gas analyzer.
- Replace gas valve if needed: If modulation is incorrect despite proper settings, the gas valve may need replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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