F24
Saunier Duval
Internal communication / PCB fault
F24 displayed, unit refuses to start, sometimes after PCB 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
Defective main PCB, Incompatible PCB firmware, Poor connection between main PCB and display board, Electrical interference
How to Fix / Troubleshooting
Safety first: Turn off power before accessing electronics.
Steps:
- Check connectors: Reseat all multi-pin connectors between the main PCB and user interface/display board.
- Inspect for damage: Look for burn marks, corrosion, or moisture on the PCB.
- Verify part numbers: Ensure any replacement PCB is the correct Saunier Duval part for your exact model and gas type.
- Replace PCB: If communication cannot be restored, the PCB set may need replacement by an authorized technician.
Warning: Incorrect PCB can cause unsafe operation. Always use genuine parts.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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