F26
Saunier Duval
Gas Valve Regulation Fault
Furnace shows F26, no ignition, may occur after gas valve replacement
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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
Incorrect gas valve calibration,Wrong gas valve model installed,Faulty modulating coil,PCB not recognizing valve feedback
How to Fix / Troubleshooting
Critical safety warning: Gas valve calibration and replacement must be performed by a licensed gas technician with appropriate instruments.
- Verify correct part: Confirm that the installed gas valve is the correct Saunier Duval part number for the furnace model and gas type.
- Check connections: Ensure all electrical connectors to the gas valve are properly seated and wired according to the schematic.
- Calibration: A technician must set burner pressure and modulation parameters using a manometer and flue gas analyzer.
- PCB compatibility: If the valve is correct but F26 persists, the main PCB may be incompatible or faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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